Hardly any mainland French towns see hotter July days than Castelnau-le-Lez
The depth of winter brings overnight lows near 1.1°C. The seasons are far apart: from a winter night to a summer afternoon the average spans 31°C. Rain is plentiful here, more than falls on 74% of mainland French towns. Plan time outside for May, September and October, when highs sit at 21–26°C.
These are the figures of Météo-France’s Prades-le-Lez station, 9.6 km north.
A year in Castelnau-le-Lez at a glance
Each month’s typical high and low in °C, at the Prades-le-Lez station.
What a year in Castelnau-le-Lez feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Prades-le-Lez.
About 870 mm of rain a year
October is the wettest month and July the driest. About 24 days a year bring 10 mm or more. 6th wettest of 96 towns of 2,500+ in Hérault.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Montpellier-Aéroport
A frosty town: 53 frosts and 125 days of 25°C a year
On about 53 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 125 days a year reach 25°C, and 61 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Prades-le-Lez: 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 Prades-le-Lez
Prades-le-Lez is 9.6 km north of Castelnau-le-Lez. Every figure on this page is the station’s, not a measurement in Castelnau-le-Lez itself.
| Station (Météo-France number) | Prades-le-Lez (34217001) |
| Distance from the town | 9.6 km north |
| Station altitude | 69 m |
| Town altitude (its center) | 48 m |
| Period | 1991–2020 |
| Nearest station of any kind | 8.1 km |
| Sunshine measured at | Montpellier-Aéroport, 8.1 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 Castelnau-le-Lez 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 Hérault.
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 |
|---|---|---|---|---|
| Castelnau-le-Lez | Prades-le-Lez | 31.6°C | 1.1°C | 870 mm |
| Jacou 2.7 km | same station | 31.6°C about the same | 1.1°C about the same | 870 mm |
| Clapiers 2.7 km | same station | 31.6°C about the same | 1.1°C about the same | 870 mm |
| Le Crès 2.9 km | same station | 31.6°C about the same | 1.1°C about the same | 870 mm |
| Saint-Aunès 4.4 km | Montpellier-Aéroport | 29.5°C 2.1°C cooler | 3.3°C 2.2°C milder | 639 mm |
| Montpellier 4.8 km | Villeneuve-lès-Mag-Inrae | 29.1°C 2.5°C cooler | 3.8°C 2.7°C milder | 592 mm |
| Teyran 5.1 km | same station | 31.6°C about the same | 1.1°C about the same | 870 mm |
Castelnau-le-Lez weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Prades-le-Lez station; sunshine at Montpellier-Aéroport.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 12.1°C | 1.1°C | 6.6°C | 79 mm | 146 |
| February | 13.5°C | 1.1°C | 7.3°C | 52 mm | 170 |
| March | 16.9°C | 3.6°C | 10.3°C | 57 mm | 219 |
| April | 19.6°C | 6.7°C | 13.1°C | 75 mm | 229 |
| May | 23.7°C | 10.2°C | 16.9°C | 64 mm | 271 |
| June | 28.6°C | 13.7°C | 21.2°C | 45 mm | 316 |
| July | 31.6°C | 16.2°C | 23.9°C | 23 mm | 345 |
| August | 31.3°C | 16.0°C | 23.6°C | 45 mm | 305 |
| September | 26.3°C | 12.3°C | 19.3°C | 112 mm | 247 |
| October | 21.0°C | 9.8°C | 15.4°C | 128 mm | 176 |
| November | 15.7°C | 5.1°C | 10.4°C | 106 mm | 146 |
| December | 12.5°C | 2.0°C | 7.3°C | 84 mm | 137 |
| Year | 21.1°C | 8.2°C | 14.6°C | 870 mm | 2,705 |
Where Castelnau-le-Lez’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Prades-le-Lez, 9.6 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, Montpellier-Aéroport, 8.1 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 Hérault.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Castelnau-le-Lez’s climate
How warm does Castelnau-le-Lez get in summer?
July is the warmest month, with average highs of 31.6°C. About 125 days a year reach 25°C, more than 98% of mainland French towns, and about 61 reach 30°C.
How cold does Castelnau-le-Lez get in winter?
January nights average 1.1°C. The air drops to 0°C or below on about 53 nights a year, and about 0 days a year stay below freezing all day.
How much rain does Castelnau-le-Lez get?
About 870 mm a year, more than 74% of mainland French towns. October is the wettest month (128 mm) and July the driest (23 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Montpellier-Aéroport (8.1 km away), averages 2,705 hours of sunshine a year.
Are these figures for Castelnau-le-Lez itself?
No: they are the normals of the Météo-France station matched to Castelnau-le-Lez, Prades-le-Lez, 9.6 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 PRADES LE LEZ, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Castelnau-le-Lez →
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.