Summer warmth: Castelmayran logs more 25-degree days than 88% of mainland French towns
In January the night’s low is typically 1.7°C. It is a dry place: less rain falls here than on 67% of mainland French towns. Wet weather is most frequent in May and least in July. Warm coats and heating bills mark the months from November to March, when means dip under 10°C.
These are the figures of Météo-France’s Castelsarrasin station, 9.5 km north-east.
A year in Castelmayran at a glance
Each month’s typical high and low in °C, at the Castelsarrasin station.
What a year in Castelmayran feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Castelsarrasin.
About 699 mm of rain a year
May is the wettest month and July the driest. About 20 days a year bring 10 mm or more. 14th wettest of 17 towns of 2,500+ in Tarn-et-Garonne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Montauban
45 frosts and 100 days of 25°C a year
On about 45 nights a year the air drops to 0°C or below, and on about 1 days it stays below freezing all day. About 100 days a year reach 25°C, and 40 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Castelsarrasin: 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 Castelsarrasin
Castelsarrasin is 9.5 km north-east of Castelmayran. Every figure on this page is the station’s, not a measurement in Castelmayran itself.
| Station (Météo-France number) | Castelsarrasin (82033005) |
| Distance from the town | 9.5 km north-east |
| Station altitude | 73 m |
| Town altitude (its center) | 92 m |
| Period | 1991–2020 |
| Sunshine measured at | Montauban, 27 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 Castelmayran 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 Tarn-et-Garonne.
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 |
|---|---|---|---|---|
| Castelmayran | Castelsarrasin | 29.0°C | 1.7°C | 699 mm |
| Castelsarrasin 6.3 km | same station | 29.0°C about the same | 1.7°C about the same | 699 mm |
| Moissac 10 km | same station | 29.0°C about the same | 1.7°C about the same | 699 mm |
| La Ville-Dieu-du-Temple 14 km | same station | 29.0°C about the same | 1.7°C about the same | 699 mm |
| Valence 15 km | Valence | 29.5°C 0.5°C warmer | 2.6°C 0.9°C milder | 747 mm |
| Beaumont-de-Lomagne 17 km | Sérignac | 28.0°C 1°C cooler | 2.9°C 1.2°C milder | 691 mm |
| Montech 17 km | Savenès | 28.2°C 0.8°C cooler | 1.8°C about the same | 705 mm |
Castelmayran weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Castelsarrasin station; sunshine at Montauban.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.5°C | 1.7°C | 5.6°C | 62 mm | 84 |
| February | 11.6°C | 1.4°C | 6.5°C | 49 mm | 120 |
| March | 15.6°C | 3.8°C | 9.7°C | 53 mm | 176 |
| April | 18.7°C | 6.3°C | 12.5°C | 70 mm | 190 |
| May | 22.5°C | 9.8°C | 16.2°C | 73 mm | 221 |
| June | 26.4°C | 13.5°C | 19.9°C | 59 mm | 243 |
| July | 29.0°C | 15.3°C | 22.1°C | 44 mm | 270 |
| August | 29.0°C | 15.2°C | 22.1°C | 50 mm | 260 |
| September | 25.3°C | 11.6°C | 18.4°C | 54 mm | 214 |
| October | 20.1°C | 8.7°C | 14.4°C | 55 mm | 154 |
| November | 13.7°C | 4.7°C | 9.2°C | 63 mm | 93 |
| December | 10.0°C | 2.3°C | 6.2°C | 67 mm | 81 |
| Year | 19.3°C | 7.9°C | 13.6°C | 699 mm | 2,104 |
Where Castelmayran’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Castelsarrasin, 9.5 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, Montauban, 27 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 Tarn-et-Garonne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Castelmayran’s climate
How warm does Castelmayran get in summer?
July is the warmest month, with average highs of 29.0°C. About 100 days a year reach 25°C, more than 88% of mainland French towns, and about 40 reach 30°C.
How cold does Castelmayran get in winter?
February nights average 1.4°C. The air drops to 0°C or below on about 45 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Castelmayran get?
About 699 mm a year, less than 67% of mainland French towns. May is the wettest month (73 mm) and July the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Montauban (27 km away), averages 2,104 hours of sunshine a year.
Are these figures for Castelmayran itself?
No: they are the normals of the Météo-France station matched to Castelmayran, Castelsarrasin, 9.5 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 CASTELSARRASIN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Castelmayran →
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.