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Rui’an, Zhejiang Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Rui’an, Zhejiang?
Rui’an, Zhejiang gets 1639 mm of precipitation a year over about 154 rainy days. July is the warmest month (average high 33°C) and January the coldest (average low 6°C).
Humid subtropical climate
Rui’an, Zhejiang has hot summers and mild winters. Daytime highs range from about 12°C in January to 33°C in July. August is usually the wettest month. The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 7° | 14° |
| Spring | Mar–May | 14° | 21° |
| Summer | Jun–Aug | 25° | 31° |
| Autumn | Sep–Nov | 18° | 25° |
How much rain does Rui’an get?
Rui’an gets 1639 mm of precipitation in an average year, spread over about 154 days with measurable rain. That is more rainy days than 92% of China.
August is the wettest month, with 230 mm. December is the driest, with 65 mm. June has the most rainy days, about 17.
The longest dry spell in the last five years lasted 30 days, to July 29, 2022.
From October 2025 to September 2026 Rui’an got 529 mm of rain, against a normal of 1639 mm for those months. July 2026 had the most, with 479 mm.
Rui’an weather by month
Rui’an weather in January
In January, Rui’an averages a high of 12°C and a low of 6°C. It gets 72 mm of precipitation over about 12 rainy days. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. The January record high is 23°C (2002) and the record low is -4°C (2016).
Rui’an weather in February
In February, Rui’an averages a high of 14°C and a low of 7°C. It gets 81 mm of precipitation over about 13 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The February record high is 28°C (2001) and the record low is -2°C (2018).
Rui’an weather in March
In March, Rui’an averages a high of 17°C and a low of 9°C. It gets 137 mm of precipitation over about 16 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The March record high is 30°C (2024) and the record low is -1°C (2005). March is one of the most comfortable months to visit.
Rui’an weather in April
In April, Rui’an averages a high of 21°C and a low of 14°C. It gets 148 mm of precipitation over about 15 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The April record high is 33°C (2008) and the record low is 7°C (2010). April is one of the most comfortable months to visit.
Rui’an weather in May
In May, Rui’an averages a high of 26°C and a low of 19°C. It gets 170 mm of precipitation over about 16 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The May record high is 35°C (2021) and the record low is 12°C (2011). May is one of the most comfortable months to visit.
Rui’an weather in June
In June, Rui’an averages a high of 29°C and a low of 23°C. It gets 222 mm of precipitation over about 17 rainy days. Estimated sunshine is 9% of daylight hours, derived from ERA5 cloud cover. The June record high is 39°C (2002) and the record low is 16°C (2008).
Rui’an weather in July
In July, Rui’an averages a high of 33°C and a low of 26°C. It gets 147 mm of precipitation over about 11 rainy days. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. The July record high is 39°C (2022) and the record low is 19°C (2015).
Rui’an weather in August
In August, Rui’an averages a high of 32°C and a low of 26°C. It gets 230 mm of precipitation over about 14 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The August record high is 39°C (2020) and the record low is 21°C (2016).
Rui’an weather in September
In September, Rui’an averages a high of 29°C and a low of 23°C. It gets 199 mm of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2020) and the record low is 16°C (2012).
Rui’an weather in October
In October, Rui’an averages a high of 26°C and a low of 18°C. It gets 79 mm of precipitation over about 7 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The October record high is 34°C (2023) and the record low is 10°C (2010). October is one of the most comfortable months to visit.
Rui’an weather in November
In November, Rui’an averages a high of 21°C and a low of 14°C. It gets 89 mm of precipitation over about 11 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The November record high is 29°C (2023) and the record low is 4°C (2008). November is one of the most comfortable months to visit.
Rui’an weather in December
In December, Rui’an averages a high of 16°C and a low of 8°C. It gets 65 mm of precipitation over about 10 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The December record high is 26°C (2001) and the record low is -2°C (2020).
Sunshine, humidity and wind in Rui’an
December is the sunniest month in Rui’an, with estimated sunshine of 48% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 9%. The annual cloud-cover estimate is 34% of daylight hours; it is not a measurement of sunshine duration. Rui’an is cloudier than 83% of China.
Humidity peaks in June at 87% and is lowest in December at 67%.
Rui’an has about 48 days a year above 32°C. Rui’an is hotter than 68% of China.
Rui’an weather records
These records cover RUIAN during 2001–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Rui’an station is 39°C, on August 25, 2020. The coldest is -4°C, on January 25, 2016.
The wettest day in the available station history brought 251 mm of precipitation, on July 19, 2005.
The best time to visit Rui’an
The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 22°C.
Winter (December–February) is mild, with average highs around 14°C and lows near 7°C.
Spring (March–May) is warm, with average highs around 21°C and lows near 14°C.
Summer (June–August) is hot, with average highs around 31°C and lows near 25°C. It can feel humid.
Autumn (September–November) is warm, with average highs around 25°C and lows near 18°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 6° | 12° | 72 mm | 12 | 70% | 45% | 23° | -4° |
| February | 7° | 14° | 81 mm | 13 | 77% | 36% | 28° | -2° |
| March | 9° | 17° | 137 mm | 16 | 79% | 30% | 30° | -1° |
| April | 14° | 21° | 148 mm | 15 | 79% | 31% | 33° | 7° |
| May | 19° | 26° | 170 mm | 16 | 82% | 21% | 35° | 12° |
| June | 23° | 29° | 222 mm | 17 | 87% | 9% | 39° | 16° |
| July | 26° | 33° | 147 mm | 11 | 84% | 25% | 39° | 19° |
| August | 26° | 32° | 230 mm | 14 | 83% | 38% | 39° | 21° |
| September | 23° | 29° | 199 mm | 12 | 78% | 38% | 36° | 16° |
| October | 18° | 26° | 79 mm | 7 | 72% | 39% | 34° | 10° |
| November | 14° | 21° | 89 mm | 11 | 73% | 42% | 29° | 4° |
| December | 8° | 16° | 65 mm | 10 | 67% | 48% | 26° | -2° |
Station: RUIAN, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 2001–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Rui’an climate questions
How much rain does Rui’an get?
Rui’an gets 1639 mm of precipitation in an average year, over about 154 rainy days.
What is the wettest month in Rui’an?
August is the wettest month in Rui’an, with 230 mm. December is the driest, with 65 mm.
How many rainy days does Rui’an have a year?
Rui’an has about 154 days with measurable rain in an average year. June has the most, about 17.
What is the hottest month in Rui’an?
July is the warmest month in Rui’an, with an average high of 33°C.
What is the coldest month in Rui’an?
January is the coldest month in Rui’an, with an average low of 6°C.
What is the record high temperature in Rui’an?
Within the available 2001–2026 station history, the record high at the Rui’an station is 39°C, set on August 25, 2020. The record low is -4°C, on January 25, 2016.
What is the sunniest month in Rui’an?
December is the sunniest month in Rui’an, with estimated sunshine of 48% of daylight hours from ERA5 cloud cover. June is the cloudiest.
What is the best time to visit Rui’an?
The most comfortable time to visit is typically March to May and October to November, when daytime highs sit near 22°C.