Rainfall in Sagy trails that of 79% of mainland French towns: 667 mm a year
In July the day’s top temperature is typically 26.1°C. Rain peaks in December and eases off in April. Frosty nights are scarcer than in 67% of mainland French towns. Warm coats and heating bills mark the months from November to March, when means dip under 10°C.
Figures from Météo-France’s Pontoise -Ville station, 9.2 km east.
A year in Sagy at a glance
Each month’s typical high and low in °C, at the Pontoise -Ville station.
What a year in Sagy 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
Sunshine by month
Hours of sunshine at Trappes
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 9.2 km east of Sagy. Every figure on this page is the station’s, not a measurement in Sagy itself.
| Station (Météo-France number) | Pontoise -Ville (95500003) |
| Distance from the town | 9.2 km east |
| Station altitude | 50 m |
| Town altitude (its center) | 54 m |
| Period | 1991–2020 |
| Nearest station of any kind | 6.9 km |
| Sunshine measured at | Trappes, 31 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 Sagy 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 |
|---|---|---|---|---|
| Sagy | Pontoise -Ville | 26.1°C | 2.7°C | 667 mm |
| Menucourt 2.8 km | Pontoise - Aéro | 24.9°C 1.2°C cooler | 1.6°C 1.1°C colder | 636 mm |
| Courdimanche 3.3 km | Pontoise - Aéro | 24.9°C 1.2°C cooler | 1.6°C 1.1°C colder | 636 mm |
| Vaux-sur-Seine 4.6 km | same station | 26.1°C about the same | 2.7°C about the same | 667 mm |
| Vauréal 5.2 km | Pontoise - Aéro | 24.9°C 1.2°C cooler | 1.6°C 1.1°C colder | 636 mm |
| Meulan-en-Yvelines 5.4 km | Pontoise - Aéro | 24.9°C 1.2°C cooler | 1.6°C 1.1°C colder | 636 mm |
| Cergy 6.1 km | Pontoise - Aéro | 24.9°C 1.2°C cooler | 1.6°C 1.1°C colder | 636 mm |
Sagy weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Pontoise -Ville station; sunshine at Trappes.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.8°C | 2.7°C | 5.3°C | 58 mm | 57 |
| February | 9.1°C | 2.6°C | 5.8°C | 52 mm | 81 |
| March | 13.1°C | 4.5°C | 8.8°C | 49 mm | 134 |
| April | 16.9°C | 6.4°C | 11.7°C | 45 mm | 176 |
| May | 20.5°C | 9.8°C | 15.2°C | 62 mm | 202 |
| June | 23.8°C | 13.0°C | 18.4°C | 54 mm | 210 |
| July | 26.1°C | 14.9°C | 20.5°C | 49 mm | 222 |
| August | 26.2°C | 14.7°C | 20.4°C | 53 mm | 216 |
| September | 22.2°C | 11.7°C | 16.9°C | 46 mm | 177 |
| October | 17.0°C | 9.1°C | 13.0°C | 64 mm | 117 |
| November | 11.5°C | 5.6°C | 8.5°C | 59 mm | 68 |
| December | 8.2°C | 3.3°C | 5.7°C | 75 mm | 55 |
| Year | 16.9°C | 8.2°C | 12.5°C | 667 mm | 1,714 |
Where Sagy’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Pontoise -Ville, 9.2 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, 31 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 Sagy’s climate
How warm does Sagy 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 Sagy 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 Sagy 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).
How sunny is it?
The nearest Météo-France station that records sunshine, Trappes (31 km away), averages 1,714 hours of sunshine a year.
Are these figures for Sagy itself?
No: they are the normals of the Météo-France station matched to Sagy, Pontoise -Ville, 9.2 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 Sagy →
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.