The Weather of June 2026 - A June with outbreaks of heavy rain
3 July 2026
Winds were weak over the coast of Guangdong on the first four days of the month. Locally, there were sunny intervals and afternoon isolated showers on 1 June. While there were still some isolated showers, the weather turned mainly fine and very hot on the next three days. Meanwhile, an area of low pressure over the northeastern part of the South China Sea intensified into a tropical depression on the morning of 4 June and moved across the southern part of Taiwan the next day. Under the continued influence of light wind conditions, it was very hot with sunny periods on 5 June and the temperature at the Hong Kong Observatory soared to the month’s highest of 34.6 degrees on the afternoon of 5 June, the hottest Corn on Ear on record. Besides, heat-triggered severe squally thundery showers started to affect Hong Kong that afternoon, bringing more than 10 millimetres of rainfall to Tuen Mun and Tsuen Wan and around 50 millimetres to the western part of Hong Kong Island.
A broad trough of low pressure brought showers and thunderstorms to the coast of Guangdong the next two days. Locally, it was mainly cloudy with showers and squally thunderstorms. More than 60 millimetres of rainfall were recorded over many places, and rainfall even exceeded 100 millimetres over Sai Kung District on these two days. A trough of low pressure formed over the northern part of Guangdong on 8 June, and gradually edged closer to the coastal area. Together with the moisture provided by the active southwest monsoon, local weather remained mainly cloudy with showers and squally thunderstorms. Showers were heavy at times and brought more than 70 millimetres of rainfall to most parts of the territory. The maximum hourly rainfall over Sha Tin District even exceeded 100 millimetres that night. Violent gusts of around 100 kilometres per hour were also recorded in Kwai Chung. The incessant downpour necessitated the issuance of the first Black Rainstorm Warning Signal of the year that night. With the southward departure of the trough of low pressure to the northern part of the South China Sea, local weather remained mainly cloudy and showers abated the next day.
Affected by an easterly airstream, local weather was mainly cloudy with one or two showers on 10 – 12 June. With the southwest monsoon affecting the coast of Guangdong, the weather of Hong Kong became unsettled with occasional showers and squally thunderstorms the next day. Showers were heavy at times. More than 40 millimetres of rainfall were recorded over many places, and rainfall even reached 100 millimetres over Tsuen Wan District and the eastern part of Lantau Island. Under the influence of a trough of low pressure and a strong southwest monsoon, it was cloudy with heavy showers and squally thunderstorms on 14 – 16 June. More than 150 millimetres of rainfall were recorded over most parts of the territory, and rainfall even exceeded 250 millimetres over Hong Kong Island, Sai Kung District and Lantau Island on these three days.
While showers subsided very slightly on 17 June as the trough of low pressure moved north, heavy showers with squally thunderstorms associated with an active southerly airstream and upper-air disturbances affected the territory on 18 June. More than 70 millimetres of rainfall were recorded over many places, and rainfall even exceeded 200 millimetres over parts of the New Territories and Lantau Island. Around 3000 strokes of cloud-to-ground lightning were recorded within Hong Kong. The outbreaks of heavy showers necessitated the issuance of the second and third Black Rainstorm Warning Signals of the year on the same day with an interval of only 3 hours and 30 minutes. This was the first time having two Black Rainstorm Warning Signals issued in one day and the shortest break between two Black Rainstorm Warning Signals since the commencement of the rainstorm warning system in 1992. In the midst of the incessant downpour, the temperature at the Observatory dropped to the month’s lowest of 24.2 degrees that afternoon.
A southerly airstream affected the coast of Guangdong the next two days. Locally, it was mainly cloudy with a few showers. There were sunny intervals during the day. With the establishment of the subtropical ridge and the subsequent anticyclone aloft, the weather of Hong Kong became very hot and mainly fine apart from isolated heat-triggered showers on 21 – 24 June. With the anticyclone weakening, apart from sunny intervals on 25 June, there were a few showers and thunderstorms with more than 20 millimetres of rainfall recorded over parts of Kowloon and the New Territories. Under the influence of a trough of low pressure, local weather was mainly cloudy with occasional showers and squally thunderstorms on 26 June. It was hot with sunny intervals in the morning, but showers were heavy around noon. More than 50 millimetres of rainfall were recorded over many places, and rainfall even reached 70 millimetres over parts of the New Territories and Lantau Island. The trough of low pressure continued to bring showers to the northern part of the South China Sea on 27 June, while there were sunny intervals and a few showers in Hong Kong. Showers and thunderstorms associated with the trough of low pressure affected the coast of Guangdong on 28 June. More than 40 millimetres of rainfall were recorded over many places. Following the gradual weakening of the trough of low pressure, a southerly airstream affected the coast of Guangdong on the last two days of the month. Locally, the weather was mainly cloudy with a few showers and thunderstorms on 29 June and 30 June. There were sunny periods during the day. More than 20 millimetres of rainfall were recorded over many places, and rainfall even exceeded 40 millimetres over Kowloon East, the New Territories East and Lantau Island on these two days.
Four tropical cyclones occurred over the South China Sea and the western North Pacific in June 2026.
Severe flooding in Tuen Mun, Yuen Long and Sheung Shui (from top to bottom) on 18 June 2026
(Courtesy of Yukching Cheung/CWOS (top) and the Hong Kong Fire Services Department (middle and bottom))
Details of issuance and cancellation of various warnings/signals in the month are summarised in Tables 1.1 to 1.6. Monthly meteorological figures and departures from normal for June are tabulated in Table 2.
Extract of Meteorological Observations in Hong Kong for June 2026
Mainly attributed to an active southwest monsoon and troughs of low pressure, there were outbreaks of heavy showers which necessitated the issuance of three Black Rainstorm Warning Signals in the month. The monthly rainfall of June 2026 was 600.5 millimetres, about 22 percent above the normal of 491.5 millimetres. The accumulated rainfall recorded in the first half of the year was 1187.3 millimetres about 10 percent above the normal figure of 1082.5 millimetres for the same period. The month was slightly hotter than usual. The monthly mean temperature of 28.6 degrees was 0.3 degrees above the normal of 28.3 degrees. With all six months warmer than usual, the first half of 2026 was exceptionally warm. The mean minimum temperature of 21.5 degrees, mean temperature of 23.3 degrees and mean maximum temperature of 26.0 degrees were respectively the highest, one of the highest and the second highest on record for the same period.
Winds were weak over the coast of Guangdong on the first four days of the month. Locally, there were sunny intervals and afternoon isolated showers on 1 June. While there were still some isolated showers, the weather turned mainly fine and very hot on the next three days. Meanwhile, an area of low pressure over the northeastern part of the South China Sea intensified into a tropical depression on the morning of 4 June and moved across the southern part of Taiwan the next day. Under the continued influence of light wind conditions, it was very hot with sunny periods on 5 June and the temperature at the Hong Kong Observatory soared to the month’s highest of 34.6 degrees on the afternoon of 5 June, the hottest Corn on Ear on record. Besides, heat-triggered severe squally thundery showers started to affect Hong Kong that afternoon, bringing more than 10 millimetres of rainfall to Tuen Mun and Tsuen Wan and around 50 millimetres to the western part of Hong Kong Island.
A broad trough of low pressure brought showers and thunderstorms to the coast of Guangdong the next two days. Locally, it was mainly cloudy with showers and squally thunderstorms. More than 60 millimetres of rainfall were recorded over many places, and rainfall even exceeded 100 millimetres over Sai Kung District on these two days. A trough of low pressure formed over the northern part of Guangdong on 8 June, and gradually edged closer to the coastal area. Together with the moisture provided by the active southwest monsoon, local weather remained mainly cloudy with showers and squally thunderstorms. Showers were heavy at times and brought more than 70 millimetres of rainfall to most parts of the territory. The maximum hourly rainfall over Sha Tin District even exceeded 100 millimetres that night. Violent gusts of around 100 kilometres per hour were also recorded in Kwai Chung. The incessant downpour necessitated the issuance of the first Black Rainstorm Warning Signal of the year that night. With the southward departure of the trough of low pressure to the northern part of the South China Sea, local weather remained mainly cloudy and showers abated the next day.
Affected by an easterly airstream, local weather was mainly cloudy with one or two showers on 10 – 12 June. With the southwest monsoon affecting the coast of Guangdong, the weather of Hong Kong became unsettled with occasional showers and squally thunderstorms the next day. Showers were heavy at times. More than 40 millimetres of rainfall were recorded over many places, and rainfall even reached 100 millimetres over Tsuen Wan District and the eastern part of Lantau Island. Under the influence of a trough of low pressure and a strong southwest monsoon, it was cloudy with heavy showers and squally thunderstorms on 14 – 16 June. More than 150 millimetres of rainfall were recorded over most parts of the territory, and rainfall even exceeded 250 millimetres over Hong Kong Island, Sai Kung District and Lantau Island on these three days.
While showers subsided very slightly on 17 June as the trough of low pressure moved north, heavy showers with squally thunderstorms associated with an active southerly airstream and upper-air disturbances affected the territory on 18 June. More than 70 millimetres of rainfall were recorded over many places, and rainfall even exceeded 200 millimetres over parts of the New Territories and Lantau Island. Around 3000 strokes of cloud-to-ground lightning were recorded within Hong Kong. The outbreaks of heavy showers necessitated the issuance of the second and third Black Rainstorm Warning Signals of the year on the same day with an interval of only 3 hours and 30 minutes. This was the first time having two Black Rainstorm Warning Signals issued in one day and the shortest break between two Black Rainstorm Warning Signals since the commencement of the rainstorm warning system in 1992. In the midst of the incessant downpour, the temperature at the Observatory dropped to the month’s lowest of 24.2 degrees that afternoon.
A southerly airstream affected the coast of Guangdong the next two days. Locally, it was mainly cloudy with a few showers. There were sunny intervals during the day. With the establishment of the subtropical ridge and the subsequent anticyclone aloft, the weather of Hong Kong became very hot and mainly fine apart from isolated heat-triggered showers on 21 – 24 June. With the anticyclone weakening, apart from sunny intervals on 25 June, there were a few showers and thunderstorms with more than 20 millimetres of rainfall recorded over parts of Kowloon and the New Territories. Under the influence of a trough of low pressure, local weather was mainly cloudy with occasional showers and squally thunderstorms on 26 June. It was hot with sunny intervals in the morning, but showers were heavy around noon. More than 50 millimetres of rainfall were recorded over many places, and rainfall even reached 70 millimetres over parts of the New Territories and Lantau Island. The trough of low pressure continued to bring showers to the northern part of the South China Sea on 27 June, while there were sunny intervals and a few showers in Hong Kong. Showers and thunderstorms associated with the trough of low pressure affected the coast of Guangdong on 28 June. More than 40 millimetres of rainfall were recorded over many places. Following the gradual weakening of the trough of low pressure, a southerly airstream affected the coast of Guangdong on the last two days of the month. Locally, the weather was mainly cloudy with a few showers and thunderstorms on 29 June and 30 June. There were sunny periods during the day. More than 20 millimetres of rainfall were recorded over many places, and rainfall even exceeded 40 millimetres over Kowloon East, the New Territories East and Lantau Island on these two days.
Four tropical cyclones occurred over the South China Sea and the western North Pacific in June 2026.
Severe flooding in Tuen Mun, Yuen Long and Sheung Shui (from top to bottom) on 18 June 2026(Courtesy of Yukching Cheung/CWOS (top) and the Hong Kong Fire Services Department (middle and bottom))
Details of issuance and cancellation of various warnings/signals in the month are summarised in Tables 1.1 to 1.6. Monthly meteorological figures and departures from normal for June are tabulated in Table 2.
Warnings and Signals issued in June 2026
| Beginning Time | Ending Time | ||
|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT |
| 14 / 6 | 1245 | 14 / 6 | 1615 |
| Colour | Beginning Time | Ending Time | ||
|---|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT | |
| Amber | 6 / 6 | 1000 | 6 / 6 | 1130 |
| Amber | 6 / 6 | 1845 | 6 / 6 | 1955 |
| Red | 6 / 6 | 1955 | 6 / 6 | 2055 |
| Amber | 6 / 6 | 2055 | 6 / 6 | 2130 |
| Amber | 7 / 6 | 1500 | 7 / 6 | 1600 |
| Amber | 8 / 6 | 0045 | 8 / 6 | 0115 |
| Red | 8 / 6 | 0115 | 8 / 6 | 0350 |
| Amber | 8 / 6 | 0350 | 8 / 6 | 0500 |
| Amber | 8 / 6 | 1920 | 8 / 6 | 1950 |
| Red | 8 / 6 | 1950 | 8 / 6 | 2035 |
| Black | 8 / 6 | 2035 | 8 / 6 | 2135 |
| Red | 8 / 6 | 2135 | 8 / 6 | 2205 |
| Amber | 8 / 6 | 2205 | 8 / 6 | 2245 |
| Amber | 13 / 6 | 0500 | 13 / 6 | 0845 |
| Amber | 13 / 6 | 1415 | 13 / 6 | 1540 |
| Amber | 14 / 6 | 2140 | 15 / 6 | 0620 |
| Amber | 15 / 6 | 1110 | 15 / 6 | 2020 |
| Amber | 16 / 6 | 1815 | 16 / 6 | 2155 |
| Amber | 18 / 6 | 0540 | 18 / 6 | 0925 |
| Amber | 18 / 6 | 1115 | 18 / 6 | 1210 |
| Red | 18 / 6 | 1210 | 18 / 6 | 1255 |
| Black | 18 / 6 | 1255 | 18 / 6 | 1505 |
| Red | 18 / 6 | 1505 | 18 / 6 | 1540 |
| Amber | 18 / 6 | 1540 | 18 / 6 | 1810 |
| Red | 18 / 6 | 1810 | 18 / 6 | 1835 |
| Black | 18 / 6 | 1835 | 18 / 6 | 2030 |
| Red | 18 / 6 | 2030 | 18 / 6 | 2105 |
| Amber | 18 / 6 | 2105 | 18 / 6 | 2225 |
| Amber | 26 / 6 | 1150 | 26 / 6 | 1215 |
| Red | 26 / 6 | 1215 | 26 / 6 | 1320 |
| Amber | 26 / 6 | 1320 | 26 / 6 | 1400 |
| Amber | 28 / 6 | 1110 | 28 / 6 | 1435 |
| Beginning Time | Ending Time | ||
|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT |
| 18 / 6 | 1330 | 19 / 6 | 0900 |
| Beginning Time | Ending Time | ||
|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT |
| 5 / 6 | 1150 | 5 / 6 | 1930 |
| 5 / 6 | 2045 | 6 / 6 | 0600 |
| 6 / 6 | 0910 | 6 / 6 | 1230 |
| 6 / 6 | 1345 | 6 / 6 | 1530 |
| 6 / 6 | 1820 | 6 / 6 | 2230 |
| 7 / 6 | 1230 | 7 / 6 | 1630 |
| 7 / 6 | 2115 | 7 / 6 | 2330 |
| 8 / 6 | 0000 | 8 / 6 | 0630 |
| 8 / 6 | 0900 | 8 / 6 | 1315 |
| 8 / 6 | 1445 | 8 / 6 | 1810 |
| 8 / 6 | 1845 | 9 / 6 | 0300 |
| 13 / 6 | 0350 | 13 / 6 | 1100 |
| 13 / 6 | 1330 | 13 / 6 | 1700 |
| 13 / 6 | 1800 | 13 / 6 | 1905 |
| 14 / 6 | 0745 | 14 / 6 | 1600 |
| 14 / 6 | 1727 | 14 / 6 | 1830 |
| 14 / 6 | 1925 | 16 / 6 | 2300 |
| 17 / 6 | 0400 | 17 / 6 | 0600 |
| 17 / 6 | 0700 | 17 / 6 | 1045 |
| 17 / 6 | 1515 | 17 / 6 | 1830 |
| 18 / 6 | 0130 | 18 / 6 | 2330 |
| 25 / 6 | 0245 | 25 / 6 | 0500 |
| 25 / 6 | 1040 | 25 / 6 | 1645 |
| 25 / 6 | 2130 | 26 / 6 | 0400 |
| 26 / 6 | 1020 | 26 / 6 | 1430 |
| 26 / 6 | 1452 | 26 / 6 | 1700 |
| 26 / 6 | 1815 | 26 / 6 | 2130 |
| 27 / 6 | 0520 | 27 / 6 | 0900 |
| 28 / 6 | 0431 | 28 / 6 | 0600 |
| 28 / 6 | 0835 | 28 / 6 | 1730 |
| 29 / 6 | 0135 | 29 / 6 | 1045 |
| 29 / 6 | 1458 | 29 / 6 | 1600 |
| 29 / 6 | 2350 | 30 / 6 | 0700 |
| 30 / 6 | 1635 | 30 / 6 | 2030 |
| Beginning Time | Ending Time | ||
|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT |
| 2 / 6 | 0645 | 5 / 6 | 1740 |
| 21 / 6 | 0645 | 25 / 6 | 1900 |
| Beginning Time | Ending Time | ||
|---|---|---|---|
| Day/Month | HKT | Day/Month | HKT |
| 18 / 6 | 1240 | 19 / 6 | 0025 |
| Meteorological Element | Figure of the Month | Departure from Normal* |
|---|---|---|
| Mean Daily Maximum Air Temperature | 31.2 degrees C | 0.5 degrees above normal |
| Mean Air Temperature | 28.6 degrees C | 0.3 degrees above normal |
| Mean Daily Minimum Air Temperature | 26.8 degrees C | 0.3 degrees above normal |
| Mean Dew Point Temperature | 25.1 degrees C | 0.2 degrees above normal |
| Mean Relative Humidity | 82 % | normal |
| Mean Cloud Amount | 83 % | 6 % above normal |
| Total Rainfall | 600.5 mm | 109.0 mm above normal |
| Number of hours of Reduced VisibilityΔ | 0 hours | 12.3 hours below normal§ |
| Total Bright Sunshine Duration | 113.8 hours | 30.5 hours below normal |
| Mean Daily Global Solar Radiation | 13.97 Megajoule / square metre | 0.64 Megajoule below normal |
| Total Evaporation | 84.4 mm | 29.4 mm below normal |
| Remarks : | All measurements were made at the Hong Kong Observatory except sunshine, solar radiation and evaporation which were recorded at King's Park Meteorological Station and visibility which was observed at the Hong Kong International Airport. |
| Δ |
The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend. |
* Departure from 1991 - 2020 climatological normal, except for number of hours of reduced visibility |
|
§ Departure from mean value between 1997 and 2025 |
|
| Remarks : | Extremely high: above 95th percentile Above normal: between 75th and 95th percentile Normal: between 25th and 75th percentile Below normal: between 5th and 25th percentile Extremely low: below 5th percentile Percentile and 5-day running average values are computed based on the data from 1991 to 2020 |
Extract of Meteorological Observations in Hong Kong for June 2026