Rainfall in Mareil-le-Guyon trails that of 76% of mainland French towns: 677 mm a year
Midwinter brings lows of about 1.7°C. Expect the heaviest rain in December and the lightest in September. About 52 nights a year bring a frost, more than in 72% of mainland French towns. Plan for rain on about 118 days a year, the days with 1 mm or more.
Figures from Météo-France’s Maule station, 13 km north.
A year in Mareil-le-Guyon at a glance
Each month’s typical high and low in °C, at the Maule station.
What a year in Mareil-le-Guyon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Maule.
About 677 mm of rain a year
December is the wettest month and September the driest. About 18 days a year bring 10 mm or more. 30th wettest of 95 towns of 2,500+ in Yvelines.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Trappes
A frosty town: 52 frosts and 63 days of 25°C a year
On about 52 nights a year the air drops to 0°C or below, and on about 3 days it stays below freezing all day. About 63 days a year reach 25°C, and 19 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Maule: 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 Maule
Maule is 13 km north of Mareil-le-Guyon. Every figure on this page is the station’s, not a measurement in Mareil-le-Guyon itself.
| Station (Météo-France number) | Maule (78380001) |
| Distance from the town | 13 km north |
| Station altitude | 33 m |
| Town altitude (its center) | 74 m |
| Period | 1991–2020 |
| Nearest station of any kind | 12 km |
| Sunshine measured at | Trappes, 12 km away |
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 Mareil-le-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 Yvelines.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Mareil-le-Guyon | Maule | 26.2°C | 1.7°C | 677 mm |
| Montfort-l'Amaury 3.2 km | Saint-Léger | 24.8°C 1.4°C cooler | 1.3°C about the same | 706 mm |
| Villiers-Saint-Frédéric 4 km | Trappes | 24.6°C 1.6°C cooler | 1.9°C about the same | 686 mm |
| Jouars-Pontchartrain 4.2 km | Trappes | 24.6°C 1.6°C cooler | 1.9°C about the same | 686 mm |
| Neauphle-le-Château 4.7 km | Trappes | 24.6°C 1.6°C cooler | 1.9°C about the same | 686 mm |
| La Queue-les-Yvelines 6.2 km | Saint-Léger | 24.8°C 1.4°C cooler | 1.3°C about the same | 706 mm |
| Maurepas 6.9 km | Trappes | 24.6°C 1.6°C cooler | 1.9°C about the same | 686 mm |
Mareil-le-Guyon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Maule station; sunshine at Trappes.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.7°C | 1.7°C | 4.7°C | 57 mm | 57 |
| February | 8.9°C | 1.3°C | 5.1°C | 50 mm | 81 |
| March | 12.9°C | 3.1°C | 8.0°C | 51 mm | 134 |
| April | 16.7°C | 4.9°C | 10.8°C | 47 mm | 176 |
| May | 20.4°C | 8.5°C | 14.4°C | 65 mm | 202 |
| June | 23.7°C | 11.6°C | 17.7°C | 56 mm | 210 |
| July | 26.2°C | 13.4°C | 19.8°C | 53 mm | 222 |
| August | 26.0°C | 13.1°C | 19.5°C | 53 mm | 216 |
| September | 22.0°C | 10.1°C | 16.1°C | 46 mm | 177 |
| October | 16.8°C | 7.7°C | 12.2°C | 65 mm | 117 |
| November | 11.3°C | 4.4°C | 7.8°C | 61 mm | 68 |
| December | 8.0°C | 2.1°C | 5.1°C | 73 mm | 55 |
| Year | 16.7°C | 6.8°C | 11.8°C | 677 mm | 1,714 |
Where Mareil-le-Guyon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Maule, 13 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.
- Sunshine: the nearest station with at least 10 years of sunshine records, Trappes, 12 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 Yvelines.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Mareil-le-Guyon’s climate
How warm does Mareil-le-Guyon get in summer?
July is the warmest month, with average highs of 26.2°C. About 63 days a year reach 25°C, more than 53% of mainland French towns, and about 19 reach 30°C.
How cold does Mareil-le-Guyon get in winter?
February nights average 1.3°C. The air drops to 0°C or below on about 52 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Mareil-le-Guyon get?
About 677 mm a year, less than 76% of mainland French towns. December is the wettest month (73 mm) and September the driest (46 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Trappes (12 km away), averages 1,714 hours of sunshine a year.
Are these figures for Mareil-le-Guyon itself?
No: they are the normals of the Météo-France station matched to Mareil-le-Guyon, Maule, 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 MAULE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Mareil-le-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.