Cergy-Pontoise, France Climate & Monthly Averages
Cergy-Pontoise has an oceanic climate. July is the hottest month, averaging 77° by day; January is the coldest at 45°.
How weather changes through the year in Cergy-Pontoise
Cergy-Pontoise is a oceanic city - mild temperatures year-round with regular rainfall. July is the warmest month at 77°F (25°C) and January the coolest at 45°F (7°C), over 30.0 inches (762 mm) of precipitation a year.
Cergy-Pontoise climate quick facts
- Hottest month: July - highs near 77°F (25°C)
- Coldest month: January - highs near 45°F (7°C)
- Decade extremes (2015-2024): 103°F (40°C) high · 16°F (-9°C) low
- Wettest month: May (12 rainy days) · Sunniest: June (11.9 h sun/day)
- Climate type: oceanic
- Annual swing: 16°C between the average warmest and coolest month · day to night: 8°C
- Snow: about 2 days a year
- Average humidity: 77%
Temperatures, rain and sunshine
July is the warm end of the year, averaging 77°F (25°C) by day and 59°F (15°C) overnight. January sits at the other end of the year: 45°F (7°C) by day, 35°F (2°C) at night. The gridded 2015-2024 daily record for this location tops out at 103°F (40°C) and bottoms at 16°F (-9°C) - decade extremes, not all-time station records. The wettest month is May (3.1 inches (78 mm) across 12 days) and the driest July.
Snow falls on roughly 2 days a year, mostly January. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is June through September. June is the brightest month at 11.9 hours of sun a day, against an annual average of 8.0 - duller than about 83% of the cities we track.
Where Cergy-Pontoise sits among other climates
- 28% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 45° | 35° | 13 | 2.7 in | 3.7 h/day | 8.7 h | 41% | 86% |
| February | 49° | 36° | 11 | 2.3 in | 5.4 h/day | 10.1 h | 40% | 81% |
| March | 54° | 39° | 14 | 2.9 in | 7.1 h/day | 11.7 h | 45% | 77% |
| April | 60° | 42° | 10 | 2.0 in | 10.2 h/day | 13.6 h | 34% | 72% |
| May | 66° | 49° | 12 | 3.1 in | 10.9 h/day | 15.3 h | 40% | 73% |
| June | 73° | 56° | 12 | 2.5 in | 11.9 h/day | 16.2 h | 39% | 71% |
| July | 77° | 59° | 9 | 1.6 in | 11.8 h/day | 15.8 h | 28% | 65% |
| August | 77° | 59° | 10 | 2.3 in | 10.9 h/day | 14.4 h | 32% | 68% |
| September | 71° | 54° | 9 | 2.3 in | 9.1 h/day | 12.5 h | 31% | 73% |
| October | 62° | 49° | 13 | 2.8 in | 6.5 h/day | 10.7 h | 41% | 81% |
| November | 52° | 42° | 12 | 2.5 in | 4.7 h/day | 9.1 h | 41% | 86% |
| December | 47° | 39° | 14 | 3.0 in | 3.6 h/day | 8.2 h | 44% | 88% |
Cergy-Pontoise month by month
Each card shows the average high and low. The bar places that month between Cergy-Pontoise's coldest night and warmest afternoon.
January
- Rain
- 13 days
- Sunshine
- 3.7 h
- Daylight
- 8.7 h
February
- Rain
- 11 days
- Sunshine
- 5.4 h
- Daylight
- 10.1 h
March
- Rain
- 14 days
- Sunshine
- 7.1 h
- Daylight
- 11.7 h
April
- Rain
- 10 days
- Sunshine
- 10.2 h
- Daylight
- 13.6 h
May
- Rain
- 12 days
- Sunshine
- 10.9 h
- Daylight
- 15.3 h
June
- Rain
- 12 days
- Sunshine
- 11.9 h
- Daylight
- 16.2 h
July
- Rain
- 9 days
- Sunshine
- 11.8 h
- Daylight
- 15.8 h
August
- Rain
- 10 days
- Sunshine
- 10.9 h
- Daylight
- 14.4 h
September
- Rain
- 9 days
- Sunshine
- 9.1 h
- Daylight
- 12.5 h
October
- Rain
- 13 days
- Sunshine
- 6.5 h
- Daylight
- 10.7 h
November
- Rain
- 12 days
- Sunshine
- 4.7 h
- Daylight
- 9.1 h
December
- Rain
- 14 days
- Sunshine
- 3.6 h
- Daylight
- 8.2 h
Looking for warmer alternatives? Browse warm places by month, or compare Cergy-Pontoise's coolest part of the year: January, December, February.
A season-by-season guide to Cergy-Pontoise
Spring (March through May)
Spring in Cergy-Pontoise is crisp but comfortable, with daytime highs averaging 60°F (15°C) and nights around 43°F (6°C); rain falls on around 36 of the 90 days.
Summer (June through August)
Summer settles into easy warmth here - highs near 76°F (24°C), nights near 58°F (15°C), and rain falls on around 30 of the 90 days. Daylight is generous - around 11.5 hours of sun a day.
Fall (September through November)
Through fall, Cergy-Pontoise is crisp but comfortable: 62°F (16°C) by day, 48°F (9°C) after dark, and rain falls on around 34 of the 90 days.
Winter (December through February)
Through winter, Cergy-Pontoise stays firmly cold: 47°F (8°C) by day, 37°F (3°C) after dark, and rain falls on around 38 of the 90 days.
Questions people ask about Cergy-Pontoise's climate
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The most useful weather window for Cergy-Pontoise
Best time to visit Cergy-Pontoise
Aim for June to September and April if you get the choice: warm days, manageable rainfall and plenty of daylight line up, and highs average 71°F (22°C) against roughly 10 wet days a month. For the same question asked the other way round, see where else is warm in June.
What to pack
Pack for Cergy-Pontoise with a warm jacket and layers for the cooler season and a compact umbrella or rain shell. Even in July, lows of 59°F (15°C) make an extra layer worth the space.
Cergy-Pontoise temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.