Hangzhou records about 1378mm of rain across roughly 112 wet days a year, which is a 31% chance on an average day. June is the wettest month at 168mm (12% of the annual total) and December the driest at 52mm. Local rain type: monsoon. Hangzhou's West Lake is legendary in rain — Chinese poets have written about "mist-veiled West Lake" for over 1,000 years. The plum rain season peaks in June.
Chance of rain on an average day: 31%
Rainfall climatology for Hangzhou. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1378mm |
| Rain days per year | 112 |
| Odds on an average day | 31% |
| Wettest month | June — 168mm over 16 days |
| Driest month | December — 52mm over 5 days |
| Rain type | monsoon |
| Best dry window | October and November offer dry, comfortable conditions with autumn colors. |
| Worst rain window | June brings the meiyu (plum rain) season — persistent drizzle for 3-4 weeks. |
June delivers 223% more rain than December (168mm vs 52mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 12% of the annual total, so rain in Hangzhou is spread through the year — there is no season you can rely on being dry.
Hangzhou rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 16 days in June against 5 in December — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 62mm | 6 | 20% | 8°C |
| February | 72mm | 7 | 23% | 8°C |
| March | 118mm | 11 | 37% | 12°C |
| April | 98mm | 9 | 30% | 18°C |
| May | 108mm | 10 | 33% | 24°C |
| June | 168mm | 16 | 53% | 30°C |
| July | 145mm | 14 | 47% | 34°C |
| August | 108mm | 10 | 33% | 34°C |
| September | 122mm | 12 | 40% | 30°C |
| October | 68mm | 6 | 20% | 24°C |
| November | 55mm | 5 | 17% | 18°C |
| December | 52mm | 5 | 17% | 12°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Hangzhou we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Hangzhou records rain on roughly 112 days a year — about a 31% chance on any given day — totalling around 1378mm.
June, with about 168mm over 16 rain days. That is 12% of the entire year's rainfall in a single month.
December is the driest month at 52mm across roughly 5 days. October and November offer dry, comfortable conditions with autumn colors.
Hangzhou's West Lake is legendary in rain — Chinese poets have written about "mist-veiled West Lake" for over 1,000 years. The plum rain season peaks in June.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.