Hangzhou is warmest in August, averaging 34° by day and 24° at night. The wettest month is June with 315 mm, and the year brings about 1683 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 11° | -0° | 71 mm | 6° | 10.2 h | Cool |
| February | 12° | 1° | 109 mm | 7° | 10.9 h | Mild |
| March | 18° | 5° | 149 mm | 10° | 11.8 h | Mild |
| April | 22° | 11° | 117 mm | 15° | 12.7 h | Mild |
| May | 27° | 16° | 155 mm | 21° | 13.5 h | Mild |
| June | 30° | 21° | 315 mm | 24° | 13.9 h | Rainy season |
| July | 32° | 25° | 254 mm | 28° | 13.8 h | Rainy season |
| August | 34° | 24° | 171 mm | 30° | 13.1 h | Mild |
| September | 30° | 20° | 162 mm | 27° | 12.2 h | Mild |
| October | 24° | 14° | 74 mm | 22° | 11.2 h | Sightseeing |
| November | 19° | 8° | 78 mm | 16° | 10.4 h | Sightseeing |
| December | 11° | 1° | 28 mm | 10° | 10.1 h | Cool |
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: No month in Hangzhou combines swimming warmth with dry skies.
Walking the city: October and November — highs of 19–24° and no more than 78 mm of rain a month.
Wet season: June and July — up to 315 mm in a single month.