Oust-Marest is among the mainland French towns with the fewest days of 25 degrees or more
Nights in January average 3.4°C. Rain peaks in December and eases off in March. By frosts alone, it ranks gentler than 84% of mainland French towns. An umbrella earns its place on about 130 days a year with 1 mm of rain or more.
Figures from Météo-France’s Dieppe station, 30 km south-west: at that distance, read them as the area’s climate rather than the town’s.
A year in Oust-Marest at a glance
Each month’s typical high and low in °C, at the Dieppe station.
What a year in Oust-Marest feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Dieppe.
About 805 mm of rain a year
December is the wettest month and March the driest. About 22 days a year bring 10 mm or more. 6th wettest of 24 towns of 2,500+ in Somme.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Le-Touquet
24 frosts and 10 days of 25°C a year
On about 24 nights a year the air drops to 0°C or below, and on about 2 days it stays below freezing all day. About 10 days a year reach 25°C, and 2 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Dieppe: 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 Dieppe
Dieppe is 30 km south-west of Oust-Marest. Every figure on this page is the station’s, not a measurement in Oust-Marest itself.
| Station (Météo-France number) | Dieppe (76217001) |
| Distance from the town | 30 km south-west |
| Station altitude | 40 m |
| Town altitude (its center) | 19 m |
| Period | 1991–2020 |
| Nearest station of any kind | 17 km |
| Sunshine measured at | Le-Touquet, 54 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 Oust-Marest 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 Somme.
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 |
|---|---|---|---|---|
| Oust-Marest | Dieppe | 20.5°C | 3.4°C | 805 mm |
| Eu 3.6 km | same station | 20.5°C about the same | 3.4°C about the same | 805 mm |
| Mers-les-Bains 6 km | same station | 20.5°C about the same | 3.4°C about the same | 805 mm |
| Le Tréport 6.9 km | same station | 20.5°C about the same | 3.4°C about the same | 805 mm |
| Friville-Escarbotin 7.5 km | Abbeville | 22.4°C 1.9°C warmer | 2.2°C 1.2°C colder | 806 mm |
| Criel-sur-Mer 11 km | same station | 20.5°C about the same | 3.4°C about the same | 805 mm |
| Blangy-sur-Bresle 17 km | Oisemont | 23.2°C 2.7°C warmer | 1.9°C 1.5°C colder | 801 mm |
Oust-Marest weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Dieppe station; sunshine at Le-Touquet.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.9°C | 3.4°C | 5.6°C | 64 mm | 62 |
| February | 8.4°C | 3.2°C | 5.8°C | 56 mm | 78 |
| March | 10.6°C | 4.8°C | 7.7°C | 49 mm | 133 |
| April | 13.1°C | 6.3°C | 9.7°C | 52 mm | 190 |
| May | 15.8°C | 9.4°C | 12.6°C | 61 mm | 210 |
| June | 18.6°C | 12.3°C | 15.4°C | 55 mm | 220 |
| July | 20.5°C | 14.3°C | 17.4°C | 58 mm | 225 |
| August | 21.2°C | 14.5°C | 17.8°C | 70 mm | 205 |
| September | 19.3°C | 12.2°C | 15.8°C | 67 mm | 161 |
| October | 15.8°C | 9.8°C | 12.8°C | 90 mm | 111 |
| November | 11.5°C | 6.5°C | 9.0°C | 89 mm | 63 |
| December | 8.5°C | 4.0°C | 6.2°C | 94 mm | 53 |
| Year | 14.3°C | 8.4°C | 11.3°C | 805 mm | 1,710 |
Where Oust-Marest’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Dieppe, 30 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, 54 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 Somme.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Oust-Marest’s climate
How warm does Oust-Marest get in summer?
August is the warmest month, with average highs of 21.2°C. About 10 days a year reach 25°C, fewer than almost every mainland French town, and about 2 reach 30°C.
How cold does Oust-Marest get in winter?
February nights average 3.2°C. The air drops to 0°C or below on about 24 nights a year, and about 2 days a year stay below freezing all day.
How much rain does Oust-Marest get?
About 805 mm a year, more than 61% of mainland French towns. December is the wettest month (94 mm) and March the driest (49 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Le-Touquet (54 km away), averages 1,710 hours of sunshine a year.
Are these figures for Oust-Marest itself?
No: they are the normals of the Météo-France station matched to Oust-Marest, Dieppe, 30 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 DIEPPE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Oust-Marest →
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.