Hennebont climate — normals and trends
Hennebont (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.0 °C and it receives 801 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (17.5 °C on average) and the coldest is February (7.0 °C). Rainfall peaks in December.
Hennebont averages 6 frost days, 0 hot days (≥ 30 °C) and 130 rainy days per year.
Hennebont has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 1 per year over the period.
The hottest day of the period reached 31.2 °C (on 18 July 2022) and the coldest -8.3 °C (on 20 January 1963).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HennebontBrittany Region
- coords
- 47.80°, -3.28°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.0°C
Average daily high
14.0°C
Average daily low
10.0°C
Annual rainfall
801mm
Sunshine / day
9.0h
Mean relative humidity
81%
Average peak wind
26.4km/h
Seasonal range
10.5°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
2.4 cm
Average feels-like high
11.7 °C
Average feels-like low
6.7 °C
Average peak gust
40.6 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
12.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.31 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.2 °C
18 July 2022
Coldest day
-8.3 °C
20 January 1963
Wettest day
48 mm
21 August 1944
Windiest day
86.9 km/h
16 October 1987
Strongest gust
136.4 km/h
16 October 1987
Hottest feels-like
33.2 °C
10 August 2003
Coldest feels-like
-17.2 °C
13 January 1987
Snowiest day
7.8 cm
7 January 1982
Sunniest day
15.4 h
15 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 9.0 °C | +0.3 °C | 203 mm | +113 mm |
| Feb | 9.4 °C | +0.6 °C | 53 mm | -20 mm |
| Mar | 11.9 °C | +1.4 °C | 39 mm | -25 mm |
| Apr | 15.4 °C | +2.9 °C | 71 mm | +16 mm |
| May | 17.2 °C | +2.0 °C | 52 mm | -7 mm |
| Jun | 20.7 °C | +2.8 °C | 28 mm | -15 mm |
| Jul | 21.3 °C | +1.6 °C | 47 mm | +10 mm |
| Aug | 21.8 °C | +2.0 °C | 35 mm | -8 mm |
| Sep | 18.0 °C | -0.3 °C | 42 mm | -13 mm |
| Oct | 16.6 °C | +1.2 °C | 73 mm | -12 mm |
| Nov | 13.6 °C | +1.7 °C | 100 mm | +5 mm |
| Dec | 10.5 °C | +0.7 °C | 125 mm | +24 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Hennebont?
Hennebont has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.0 °C and it receives 801 mm of precipitation per year.
What is the hottest day ever recorded in Hennebont?
The hottest day measured in Hennebont between 1940 and 2025 was 18 July 2022, reaching 31.2 °C.
What is the coldest day in Hennebont?
The coldest day measured in Hennebont between 1940 and 2025 was 20 January 1963, at -8.3 °C.
Does it snow in Hennebont?
Yes. Hennebont gets on average 2.4 cm of snow per year and has around 6 frost days.
Has the climate of Hennebont warmed?
Yes: Hennebont warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hennebont?
The wettest day measured in Hennebont between 1940 and 2025 was 21 August 1944, with 48 mm of rain in 24 hours.
What was the windiest day in Hennebont?
The windiest day measured in Hennebont between 1940 and 2025 was 16 October 1987, with winds reaching 86.9 km/h.
What is the warmest month in Hennebont?
The warmest month in Hennebont is August (17.5 °C on average); the coldest is February (7.0 °C).
How much does it rain in Hennebont?
Hennebont receives on average 801 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Hennebont?
Hennebont gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hennebont?
The heaviest 24-hour snowfall measured in Hennebont between 1940 and 2025 was 7 January 1982, with 7.8 cm.
Are there tropical nights in Hennebont?
Yes: Hennebont has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hennebont?
In Hennebont, between 1940 and 2025, the highest apparent temperature reached 33.2 °C on 10 August 2003, and the lowest was -17.2 °C on 13 January 1987.
Compare Hennebont with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hennebont