Summer arrives softly in Herlin-le-Sec, cooler than in 93% of mainland French towns
The coldest hours of a January night bottom out at 1.1°C on average. It is a wet place: more rain falls here than on 90% of mainland French towns. Winter and summer sit 22°C apart. The outdoor season runs from June to September, with highs of 19–23°C.
These are the figures of Météo-France’s Fiefs station, 16 km north.
A year in Herlin-le-Sec at a glance
Each month’s typical high and low in °C, at the Fiefs station.
What a year in Herlin-le-Sec feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Fiefs.
About 1,071 mm of rain a year
December is the wettest month and April the driest. About 33 days a year bring 10 mm or more. 3rd wettest of 131 towns of 2,500+ in Pas-de-Calais.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Le-Touquet
A frosty town: 53 frosts and 29 days of 25°C a year
On about 53 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 29 days a year reach 25°C, and 6 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Fiefs: 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 Fiefs
Fiefs is 16 km north of Herlin-le-Sec. Every figure on this page is the station’s, not a measurement in Herlin-le-Sec itself.
| Station (Météo-France number) | Fiefs (62333001) |
| Distance from the town | 16 km north |
| Station altitude | 180 m |
| Town altitude (its center) | 149 m |
| Period | 1991–2020 |
| Nearest station of any kind | 8.4 km |
| Sunshine measured at | Le-Touquet, 53 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 Herlin-le-Sec 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 Pas-de-Calais.
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 |
|---|---|---|---|---|
| Herlin-le-Sec | Fiefs | 22.7°C | 1.1°C | 1,071 mm |
| Saint-Pol-sur-Ternoise 2.7 km | same station | 22.7°C about the same | 1.1°C about the same | 1,071 mm |
| Frévent 9.4 km | Bernaville | 22.4°C about the same | 1.3°C about the same | 877 mm |
| Divion 18 km | same station | 22.7°C about the same | 1.1°C about the same | 1,071 mm |
| Calonne-Ricouart 19 km | same station | 22.7°C about the same | 1.1°C about the same | 1,071 mm |
| Cauchy-à-la-Tour 19 km | same station | 22.7°C about the same | 1.1°C about the same | 1,071 mm |
| Houdain 19 km | same station | 22.7°C about the same | 1.1°C about the same | 1,071 mm |
Herlin-le-Sec weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Fiefs station; sunshine at Le-Touquet.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.0°C | 1.1°C | 3.5°C | 104 mm | 62 |
| February | 6.9°C | 1.2°C | 4.0°C | 87 mm | 78 |
| March | 10.3°C | 2.8°C | 6.6°C | 76 mm | 133 |
| April | 14.2°C | 4.7°C | 9.4°C | 64 mm | 190 |
| May | 17.6°C | 7.8°C | 12.7°C | 76 mm | 210 |
| June | 20.4°C | 10.7°C | 15.5°C | 74 mm | 220 |
| July | 22.7°C | 12.8°C | 17.7°C | 81 mm | 225 |
| August | 22.7°C | 12.9°C | 17.8°C | 85 mm | 205 |
| September | 19.3°C | 10.4°C | 14.9°C | 83 mm | 161 |
| October | 14.7°C | 7.6°C | 11.1°C | 101 mm | 111 |
| November | 9.7°C | 4.3°C | 7.0°C | 113 mm | 63 |
| December | 6.6°C | 1.8°C | 4.2°C | 126 mm | 53 |
| Year | 14.3°C | 6.5°C | 10.4°C | 1,071 mm | 1,710 |
Where Herlin-le-Sec’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Fiefs, 16 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, Le-Touquet, 53 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 Pas-de-Calais.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Herlin-le-Sec’s climate
How warm does Herlin-le-Sec get in summer?
July is the warmest month, with average highs of 22.7°C. About 29 days a year reach 25°C, fewer than 92% of mainland French towns, and about 6 reach 30°C.
How cold does Herlin-le-Sec 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 7 days a year stay below freezing all day.
How much rain does Herlin-le-Sec get?
About 1,071 mm a year, more than 90% of mainland French towns. December is the wettest month (126 mm) and April the driest (64 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Le-Touquet (53 km away), averages 1,710 hours of sunshine a year.
Are these figures for Herlin-le-Sec itself?
No: they are the normals of the Météo-France station matched to Herlin-le-Sec, Fiefs, 16 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 FIEFS, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Herlin-le-Sec →
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.