Hong Kong Island is warmest in July, averaging 31° by day and 27° at night. The wettest month is June with 339 mm, and the year brings about 1957 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 21° | 13° | 19 mm | 19° | 10.8 h | Sightseeing |
| February | 22° | 14° | 70 mm | 19° | 11.2 h | Sightseeing |
| March | 25° | 18° | 102 mm | 20° | 11.8 h | Sightseeing |
| April | 27° | 21° | 132 mm | 23° | 12.5 h | Mild |
| May | 29° | 25° | 304 mm | 26° | 13.1 h | Rainy season |
| June | 30° | 27° | 339 mm | 28° | 13.4 h | Rainy season |
| July | 31° | 27° | 208 mm | 29° | 13.2 h | Rainy season |
| August | 31° | 27° | 338 mm | 29° | 12.8 h | Rainy season |
| September | 31° | 26° | 264 mm | 29° | 12.1 h | Rainy season |
| October | 28° | 23° | 84 mm | 27° | 11.5 h | Beach weather |
| November | 26° | 19° | 78 mm | 24° | 10.9 h | Beach weather |
| December | 21° | 14° | 19 mm | 21° | 10.6 h | Sightseeing |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: October and November — highs around 27°, nights no colder than 19°, and at most 84 mm of rain in a month. The sea sits at 24–27° then.
Walking the city: January, February, March and December — highs of 21–25° and no more than 102 mm of rain a month.
Wet season: May, June, July, August and September — up to 339 mm in a single month.