HONG KONG – August 2025 saw significantly higher than average rainfall, with totals ranking as the third-highest ever recorded for the month, according to the Observatory.
By [Invented Reporter] | HONG KONG – 2025/09/02 09:19:33
The Observatory reported that August 2025 was “far more rainy than normal.” total rainfall reached 939.2 mm, exceeding the normal August value of 453.2 mm by more than double and marking the third-highest August rainfall on record.
While rainfall in Hong Kong during the first half of the year was below average, heavy rains in July and august brought the accumulated rainfall for the first eight months of the year to 1,985.3 mm, aligning with the normal value of 1921.5 mm for the same period.
Record-Breaking Rainfall events
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The Observatory Headquarters recorded a record 368.9 mm of daily rainfall, the highest daily rainfall in august since 1884.
The “Black Rain” event on August 5 saw the Observatory Headquarters record 368.9 mm of daily rainfall,the highest daily rainfall in August since 1884. This single-day rainfall accounted for over 80% of the normal rainfall for the entire month. From August 2 to August 5, accumulated rainfall neared 600 mm, with Tseung Kwan O and Tse Yun Mountain exceeding 800 mm. The Observatory has issued 5 black rainstorm warnings this year, surpassing previous records.
Tropical Cyclone Activity
In August, Hong Kong experienced the effects of tropical cyclones including willows, a tropical depression, swordfish, and Blue Lake. A No. 1 alert signal was issued for Blue Lake on August 28, marking the eighth such instance this year and exceeding the highest record for January to August since 1946.
