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Cergy-Pontoise, Île-de-France Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Cergy-Pontoise, Île-de-France?
Cergy-Pontoise, Île-de-France gets 560 mm of precipitation a year over about 148 rainy days. July is the warmest month (average high 26°C) and January the coldest (average low 2°C).
Oceanic climate
Cergy-Pontoise, Île-de-France has warm summers and chilly winters. Daytime highs range from about 8°C in January to 26°C in July. May is usually the wettest month. The most comfortable time to visit is typically June to September, when daytime highs sit near 24°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 3° | 8° |
| Spring | Mar–May | 7° | 17° |
| Summer | Jun–Aug | 14° | 25° |
| Autumn | Sep–Nov | 9° | 17° |
How much rain does Cergy-Pontoise get?
Cergy-Pontoise gets 560 mm of precipitation in an average year, spread over about 148 days with measurable rain. That is fewer rainy days than 67% of France.
May is the wettest month, with 61 mm. March is the driest, with 37 mm. December has the most rainy days, about 15.
The longest dry spell in the last five years lasted 24 days, to June 9, 2023.
Cergy-Pontoise weather by month
Cergy-Pontoise weather in January
In January, Cergy-Pontoise averages a high of 8°C and a low of 2°C. It gets 41 mm of precipitation over about 13 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The January record high is 16°C (1999) and the record low is -14°C (1985).
Cergy-Pontoise weather in February
In February, Cergy-Pontoise averages a high of 9°C and a low of 2°C. It gets 40 mm of precipitation over about 13 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The February record high is 21°C (1990) and the record low is -12°C (1991).
Cergy-Pontoise weather in March
In March, Cergy-Pontoise averages a high of 13°C and a low of 4°C. It gets 37 mm of precipitation over about 12 rainy days. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. The March record high is 26°C (2021) and the record low is -8°C (2005).
Cergy-Pontoise weather in April
In April, Cergy-Pontoise averages a high of 16°C and a low of 7°C. It gets 41 mm of precipitation over about 12 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The April record high is 28°C (2018) and the record low is -2°C (2013).
Cergy-Pontoise weather in May
In May, Cergy-Pontoise averages a high of 20°C and a low of 10°C. It gets 61 mm of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The May record high is 32°C (2005) and the record low is 1°C (2019).
Cergy-Pontoise weather in June
In June, Cergy-Pontoise averages a high of 23°C and a low of 13°C. It gets 48 mm of precipitation over about 11 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The June record high is 36°C (2022) and the record low is 6°C (2006). June is one of the most comfortable months to visit.
Cergy-Pontoise weather in July
In July, Cergy-Pontoise averages a high of 26°C and a low of 16°C. It gets 50 mm of precipitation over about 10 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The July record high is 42°C (2019) and the record low is 8°C (2015). July is one of the most comfortable months to visit.
Cergy-Pontoise weather in August
In August, Cergy-Pontoise averages a high of 26°C and a low of 15°C. It gets 46 mm of precipitation over about 10 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The August record high is 37°C (2020) and the record low is 8°C (2014). August is one of the most comfortable months to visit.
Cergy-Pontoise weather in September
In September, Cergy-Pontoise averages a high of 22°C and a low of 12°C. It gets 40 mm of precipitation over about 11 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2023) and the record low is 3°C (2018). September is one of the most comfortable months to visit.
Cergy-Pontoise weather in October
In October, Cergy-Pontoise averages a high of 17°C and a low of 9°C. It gets 51 mm of precipitation over about 14 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The October record high is 28°C (2011) and the record low is -2°C (2010).
Cergy-Pontoise weather in November
In November, Cergy-Pontoise averages a high of 11°C and a low of 5°C. It gets 49 mm of precipitation over about 15 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The November record high is 21°C (2015) and the record low is -6°C (1998).
Cergy-Pontoise weather in December
In December, Cergy-Pontoise averages a high of 8°C and a low of 3°C. It gets 56 mm of precipitation over about 15 rainy days. Estimated sunshine is 18% of daylight hours, derived from ERA5 cloud cover. The December record high is 17°C (1989) and the record low is -8°C (1996).
Sunshine, humidity and wind in Cergy-Pontoise
April is the sunniest month in Cergy-Pontoise, with estimated sunshine of 41% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 18%. The annual cloud-cover estimate is 33% of daylight hours; it is not a measurement of sunshine duration. Cergy-Pontoise is cloudier than 84% of France.
Humidity peaks in December at 89% and is lowest in July at 65%.
Cergy-Pontoise has about 5 days a year above 32°C. Cergy-Pontoise is cooler than 64% of France.
First and last freeze in Cergy-Pontoise
The first fall freeze in Cergy-Pontoise typically comes around November 19, and the last spring freeze around March 11. That leaves a frost-free growing season of about 253 days.
Cergy-Pontoise weather records
These records cover LE BOURGET during 1970–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Cergy-Pontoise station is 42°C, on July 25, 2019. The coldest is -14°C, on January 17, 1985.
The wettest day in the available station history brought 96 mm of precipitation, on August 24, 1987.
45 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°C per decade since 1970.
The best time to visit Cergy-Pontoise
The most comfortable time to visit is typically June to September, when daytime highs sit near 24°C.
Winter (December–February) is chilly, with average highs around 8°C and lows near 3°C.
Spring (March–May) is mild, with average highs around 16°C and lows near 7°C.
Summer (June–August) is warm, with average highs around 25°C and lows near 14°C.
Autumn (September–November) is mild, with average highs around 16°C and lows near 9°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 2° | 8° | 41 mm | 13 | 87% | 22% | 16° | -14° |
| February | 2° | 9° | 40 mm | 13 | 81% | 27% | 21° | -12° |
| March | 4° | 13° | 37 mm | 12 | 73% | 35% | 26° | -8° |
| April | 7° | 16° | 41 mm | 12 | 68% | 41% | 28° | -2° |
| May | 10° | 20° | 61 mm | 12 | 70% | 39% | 32° | 1° |
| June | 13° | 23° | 48 mm | 11 | 70% | 41% | 36° | 6° |
| July | 16° | 26° | 50 mm | 10 | 65% | 41% | 42° | 8° |
| August | 15° | 26° | 46 mm | 10 | 68% | 40% | 37° | 8° |
| September | 12° | 22° | 40 mm | 11 | 75% | 40% | 36° | 3° |
| October | 9° | 17° | 51 mm | 14 | 83% | 29% | 28° | -2° |
| November | 5° | 11° | 49 mm | 15 | 88% | 26% | 21° | -6° |
| December | 3° | 8° | 56 mm | 15 | 89% | 18% | 17° | -8° |
Station: LE BOURGET, 27 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2025; 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.
Cergy-Pontoise climate questions
How much rain does Cergy-Pontoise get?
Cergy-Pontoise gets 560 mm of precipitation in an average year, over about 148 rainy days.
What is the wettest month in Cergy-Pontoise?
May is the wettest month in Cergy-Pontoise, with 61 mm. March is the driest, with 37 mm.
How many rainy days does Cergy-Pontoise have a year?
Cergy-Pontoise has about 148 days with measurable rain in an average year. December has the most, about 15.
What is the hottest month in Cergy-Pontoise?
July is the warmest month in Cergy-Pontoise, with an average high of 26°C.
What is the coldest month in Cergy-Pontoise?
January is the coldest month in Cergy-Pontoise, with an average low of 2°C.
What is the record high temperature in Cergy-Pontoise?
Within the available 1970–2025 station history, the record high at the Cergy-Pontoise station is 42°C, set on July 25, 2019. The record low is -14°C, on January 17, 1985.
What is the sunniest month in Cergy-Pontoise?
April is the sunniest month in Cergy-Pontoise, with estimated sunshine of 41% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Cergy-Pontoise?
The first fall freeze in Cergy-Pontoise typically comes around November 19. The last spring freeze is around March 11.
What is the best time to visit Cergy-Pontoise?
The most comfortable time to visit is typically June to September, when daytime highs sit near 24°C.
Climate for places near Cergy-Pontoise, Île-de-France
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