Dry weather: only 642 mm a year falls on La Roche-Guyon, less than on 85% of mainland French towns
Deep winter brings January lows near 1.7°C. Days of 25°C are scarce: about 49 a year, fewer than in 69% of mainland French towns. Seasons differ by 24°C, from the coldest nights to the warmest afternoons. Waterproofs come out on about 115 days a year, each with 1 mm of rain or more.
These are the figures of Météo-France’s Magnanville station, 13 km south.
A year in La Roche-Guyon at a glance
Each month’s typical high and low in °C, at the Magnanville station.
What a year in La Roche-Guyon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Magnanville.
About 642 mm of rain a year
December is the wettest month and September the driest. About 16 days a year bring 10 mm or more. 43rd wettest of 76 towns of 2,500+ in Val-d'Oise.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Evreux-Huest
40 frosts and 49 days of 25°C a year
On about 40 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 49 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Magnanville: 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 Magnanville
Magnanville is 13 km south of La Roche-Guyon. Every figure on this page is the station’s, not a measurement in La Roche-Guyon itself.
| Station (Météo-France number) | Magnanville (78354001) |
| Distance from the town | 13 km south |
| Station altitude | 123 m |
| Town altitude (its center) | 20 m |
| Period | 1995–2020 (the station’s own record) |
| Sunshine measured at | Evreux-Huest, 30 km away |
La Roche-Guyon sits 103 m lower than the station. Air usually warms by about 0.65°C every 100 m you go down, so expect La Roche-Guyon to run about 0.7°C warmer than these figures.
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 La Roche-Guyon 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 |
|---|---|---|---|---|
| La Roche-Guyon | Magnanville | 25.5°C | 1.7°C | 642 mm |
| Gasny 2.4 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
| Freneuse 4.9 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
| Bonnières-sur-Seine 6.5 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
| Rosny-sur-Seine 9.2 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
| Mantes-la-Jolie 11 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
| Vernon 11 km | same station | 25.5°C about the same | 1.7°C about the same | 642 mm |
La Roche-Guyon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Magnanville station; sunshine at Evreux-Huest.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.8°C | 1.7°C | 4.3°C | 49 mm | 64 |
| February | 8.4°C | 1.8°C | 5.1°C | 48 mm | 80 |
| March | 12.1°C | 3.6°C | 7.8°C | 48 mm | 128 |
| April | 15.8°C | 5.5°C | 10.7°C | 43 mm | 173 |
| May | 19.1°C | 8.6°C | 13.9°C | 62 mm | 194 |
| June | 22.8°C | 11.6°C | 17.2°C | 54 mm | 208 |
| July | 25.5°C | 13.4°C | 19.5°C | 52 mm | 214 |
| August | 25.3°C | 13.6°C | 19.5°C | 57 mm | 206 |
| September | 21.4°C | 10.9°C | 16.2°C | 41 mm | 170 |
| October | 16.5°C | 8.6°C | 12.5°C | 65 mm | 120 |
| November | 10.7°C | 4.8°C | 7.7°C | 57 mm | 72 |
| December | 7.2°C | 2.3°C | 4.8°C | 67 mm | 62 |
| Year | 16.0°C | 7.2°C | 11.6°C | 642 mm | 1,690 |
Where La Roche-Guyon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Magnanville, 13 km away: statistics for 1991–2020 (the station’s own years, 1995–2020, where its record is shorter).
- 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.
- Sunshine: the nearest station with at least 10 years of sunshine records, Evreux-Huest, 30 km away.
- 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 La Roche-Guyon’s climate
How warm does La Roche-Guyon get in summer?
July is the warmest month, with average highs of 25.5°C. About 49 days a year reach 25°C, fewer than 69% of mainland French towns, and about 12 reach 30°C.
How cold does La Roche-Guyon get in winter?
January nights average 1.7°C. The air drops to 0°C or below on about 40 nights a year, and about 4 days a year stay below freezing all day.
How much rain does La Roche-Guyon get?
About 642 mm a year, less than 85% of mainland French towns. December is the wettest month (67 mm) and September the driest (41 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Evreux-Huest (30 km away), averages 1,690 hours of sunshine a year.
Are these figures for La Roche-Guyon itself?
No: they are the normals of the Météo-France station matched to La Roche-Guyon, Magnanville, 13 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 MAGNANVILLE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for La Roche-Guyon →
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.