Bernes-sur-Oise is drier than 79% of mainland French towns: 667 mm of rain a year
January mornings start at about 2.7°C. The rainiest month is December; the driest is April. Frost is rarer than in 67% of mainland French towns: about 35 nights a year drop below freezing. Comfortable outdoor weather lasts from May to October, with highs of 17–26°C.
These are the figures of Météo-France’s Pontoise -Ville station, 20 km south-west.
A year in Bernes-sur-Oise at a glance
Each month’s typical high and low in °C, at the Pontoise -Ville station.
What a year in Bernes-sur-Oise feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Pontoise -Ville.
About 667 mm of rain a year
December is the wettest month and April the driest. About 18 days a year bring 10 mm or more. 15th wettest of 76 towns of 2,500+ in Val-d'Oise.
Rain by month
Millimeters
35 frosts and 62 days of 25°C a year
On about 35 nights a year the air drops to 0°C or below, and on about 3 days it stays below freezing all day. About 62 days a year reach 25°C, and 18 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Pontoise -Ville: a frost is a night of 0°C or below, a summer day (jour d’été) 25°C or more, a hot day (forte chaleur) 30°C or more.
The Météo-France station at Pontoise -Ville
Pontoise -Ville is 20 km south-west of Bernes-sur-Oise. Every figure on this page is the station’s, not a measurement in Bernes-sur-Oise itself.
| Station (Météo-France number) | Pontoise -Ville (95500003) |
| Distance from the town | 20 km south-west |
| Station altitude | 50 m |
| Town altitude (its center) | 28 m |
| Period | 1991–2020 |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Bernes-sur-Oise compares
Against the 4,385 towns of 2,500 or more in mainland France, each read from its own matched station. The dots are the other towns of 2,500+ in Val-d'Oise.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km. Where a neighbor uses the same station its figures are the same: the differences you’d feel over a few kilometers aren’t in the normals.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Bernes-sur-Oise | Pontoise -Ville | 26.1°C | 2.7°C | 667 mm |
| Persan 1.8 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
| Beaumont-sur-Oise 2.1 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
| Bruyères-sur-Oise 2.7 km | Creil | 24.9°C 1.2°C cooler | 1.4°C 1.3°C colder | 662 mm |
| Chambly 3.6 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
| Champagne-sur-Oise 4.8 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
| Presles 5.3 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
Bernes-sur-Oise weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Pontoise -Ville station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.8°C | 2.7°C | 5.3°C | 58 mm |
| February | 9.1°C | 2.6°C | 5.8°C | 52 mm |
| March | 13.1°C | 4.5°C | 8.8°C | 49 mm |
| April | 16.9°C | 6.4°C | 11.7°C | 45 mm |
| May | 20.5°C | 9.8°C | 15.2°C | 62 mm |
| June | 23.8°C | 13.0°C | 18.4°C | 54 mm |
| July | 26.1°C | 14.9°C | 20.5°C | 49 mm |
| August | 26.2°C | 14.7°C | 20.4°C | 53 mm |
| September | 22.2°C | 11.7°C | 16.9°C | 46 mm |
| October | 17.0°C | 9.1°C | 13.0°C | 64 mm |
| November | 11.5°C | 5.6°C | 8.5°C | 59 mm |
| December | 8.2°C | 3.3°C | 5.7°C | 75 mm |
| Year | 16.9°C | 8.2°C | 12.5°C | 667 mm |
Where Bernes-sur-Oise’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Pontoise -Ville, 20 km away: statistics for 1991–2020.
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Val-d'Oise.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Bernes-sur-Oise’s climate
How warm does Bernes-sur-Oise get in summer?
August is the warmest month, with average highs of 26.2°C. About 62 days a year reach 25°C, more than 53% of mainland French towns, and about 18 reach 30°C.
How cold does Bernes-sur-Oise get in winter?
February nights average 2.6°C. The air drops to 0°C or below on about 35 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Bernes-sur-Oise get?
About 667 mm a year, less than 79% of mainland French towns. December is the wettest month (75 mm) and April the driest (45 mm).
Are these figures for Bernes-sur-Oise itself?
No: they are the normals of the Météo-France station matched to Bernes-sur-Oise, Pontoise -Ville, 20 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station PONTOISE -VILLE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Bernes-sur-Oise →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.