Olonne-sur-Mer climate — normals and trends

Q: What is the climate of Olonne-sur-Mer?

Olonne-sur-Mer has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.9 °C and it receives 779 mm of precipitation per year.

Q: What is the hottest day ever recorded in Olonne-sur-Mer?

The hottest day measured in Olonne-sur-Mer between 1940 and 2025 was 17 June 2022, reaching 33.7 °C.

Q: What is the coldest day in Olonne-sur-Mer?

The coldest day measured in Olonne-sur-Mer between 1940 and 2025 was 12 January 1987, at -8.2 °C.

Q: Does it snow in Olonne-sur-Mer?

Yes. Olonne-sur-Mer gets on average 1.6 cm of snow per year and has around 7 frost days.

Q: Has the climate of Olonne-sur-Mer warmed?

Yes: Olonne-sur-Mer warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Olonne-sur-Mer?

The wettest day measured in Olonne-sur-Mer between 1940 and 2025 was 28 September 1991, with 50 mm of rain in 24 hours.

Q: What was the windiest day in Olonne-sur-Mer?

The windiest day measured in Olonne-sur-Mer between 1940 and 2025 was 27 December 1999, with winds reaching 88.7 km/h.

Q: What is the warmest month in Olonne-sur-Mer?

The warmest month in Olonne-sur-Mer is August (19.0 °C on average); the coldest is January (7.3 °C).

Q: How much does it rain in Olonne-sur-Mer?

Olonne-sur-Mer receives on average 779 mm of precipitation per year, spread over about 127 rainy days.

Q: Is it sunny in Olonne-sur-Mer?

Olonne-sur-Mer gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

Olonne-sur-Mer (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.9 °C and it receives 779 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 (19.0 °C on average) and the coldest is January (7.3 °C). Rainfall peaks in November.

Olonne-sur-Mer averages 7 frost days, 0 hot days (≥ 30 °C) and 127 rainy days per year.

Olonne-sur-Mer has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.

The number of frost days there went from about 12 to 2 per year over the period.

The hottest day of the period reached 33.7 °C (on 17 June 2022) and the coldest -8.2 °C (on 12 January 1987).

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

Olonne-sur-MerPays de la Loire Region

coords: 46.54°, -1.77°
period: 1940–2025 · 86 yrs

CfbTemperate oceanicWarmest monthAugustColdest monthJanuaryWettest monthNovemberDriest monthJuly

Mean daily temperature

12.9°C

Average daily high

14.9°C

Average daily low

11.0°C

Annual rainfall

779mm

Sunshine / day

9.3h

Mean relative humidity

79%

Average peak wind

25.9km/h

Seasonal range

11.7°C

Frost days (< 0 °C)

7 d/yr

Hot days (≥ 30 °C)

0 d/yr

Rainy days (≥ 1 mm)

127 d/yr

Annual snowfall

1.6 cm

Average feels-like high

12.8 °C

Average feels-like low

7.9 °C

Average peak gust

38.6 km/h

Tropical nights (≥ 20 °C)

4 d/yr

Solar radiation

13.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.3 °C

since 1940

+0.2 °C per decade · r² = 0.34 · p = < 0.001

19402025

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

33.7 °C

17 June 2022

Coldest day

-8.2 °C

12 January 1987

Wettest day

50 mm

28 September 1991

Windiest day

88.7 km/h

27 December 1999

Strongest gust

142.6 km/h

27 December 1999

Hottest feels-like

35.3 °C

10 August 2003

Coldest feels-like

-16.9 °C

12 January 1987

Snowiest day

10.9 cm

26 January 1945

Sunniest day

15.4 h

22 June 2018

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	33.0 °C15 August 2025	-0.4 °C14 January 2025	14.2 °C	821 mm	2	1
2024	30.3 °C11 August 2024	-0.4 °C20 January 2024	13.8 °C	996 mm	1	1
2023	30.1 °C23 August 2023	-0.2 °C22 January 2023	14.4 °C	1,028 mm	1	1
2022	33.7 °C17 June 2022	-0.1 °C17 December 2022	14.5 °C	706 mm	6	1
2021	28.5 °C6 September 2021	-0.1 °C11 February 2021	13.3 °C	721 mm	0	1
2020	29.5 °C30 July 2020	2.4 °C21 January 2020	14.4 °C	876 mm	0	0
2019	31.0 °C26 June 2019	1.6 °C5 January 2019	13.8 °C	846 mm	3	0
2018	29.9 °C3 August 2018	-3.6 °C28 February 2018	13.9 °C	837 mm	0	3
2017	28.7 °C17 July 2017	-2.2 °C20 January 2017	13.6 °C	570 mm	0	3
2016	30.9 °C18 July 2016	1.0 °C31 December 2016	13.4 °C	674 mm	2	0
2015	29.5 °C30 June 2015	0.4 °C6 February 2015	13.5 °C	725 mm	0	0
2014	28.4 °C17 July 2014	-1.1 °C29 December 2014	14.2 °C	924 mm	0	1
2013	27.0 °C14 July 2013	-1.0 °C23 February 2013	12.9 °C	847 mm	0	4
2012	28.4 °C17 August 2012	-5.3 °C8 February 2012	13.0 °C	813 mm	0	13
2011	28.7 °C20 August 2011	-0.2 °C31 January 2011	13.9 °C	555 mm	0	1
2010	26.5 °C8 July 2010	-3.2 °C5 January 2010	12.1 °C	715 mm	0	22
2009	30.0 °C1 July 2009	-3.6 °C7 January 2009	13.1 °C	819 mm	1	12
2008	26.0 °C30 August 2008	0.4 °C28 December 2008	12.9 °C	800 mm	0	0
2007	26.1 °C4 August 2007	-1.5 °C26 January 2007	13.3 °C	692 mm	0	2
2006	31.0 °C16 July 2006	-1.2 °C28 January 2006	13.6 °C	825 mm	1	3
2005	30.5 °C18 June 2005	-4.1 °C1 March 2005	13.1 °C	509 mm	1	8
2004	31.0 °C1 August 2004	-0.4 °C1 March 2004	13.1 °C	633 mm	1	3
2003	31.5 °C4 August 2003	-4.3 °C9 January 2003	13.7 °C	727 mm	1	12
2002	25.3 °C19 July 2002	0.9 °C1 January 2002	13.4 °C	842 mm	0	0
2001	30.6 °C25 June 2001	-3.0 °C15 December 2001	13.0 °C	832 mm	1	7
2000	28.9 °C24 August 2000	-1.4 °C25 January 2000	13.3 °C	965 mm	0	2
1999	27.4 °C25 July 1999	-0.4 °C14 February 1999	13.6 °C	1,037 mm	0	1
1998	27.3 °C7 August 1998	-0.6 °C2 February 1998	12.9 °C	805 mm	0	4
1997	28.3 °C8 August 1997	-6.2 °C2 January 1997	13.7 °C	728 mm	0	6
1996	27.5 °C19 July 1996	-6.2 °C29 December 1996	12.6 °C	682 mm	0	7
1995	29.3 °C20 July 1995	-0.4 °C6 December 1995	13.6 °C	829 mm	0	2
1994	28.7 °C16 July 1994	-0.6 °C14 February 1994	13.8 °C	1,070 mm	0	1
1993	27.4 °C21 August 1993	-1.6 °C3 January 1993	12.7 °C	781 mm	0	8
1992	26.2 °C8 August 1992	-2.0 °C22 January 1992	12.9 °C	694 mm	0	4
1991	27.9 °C21 August 1991	-5.2 °C7 February 1991	12.4 °C	738 mm	0	13
1990	31.5 °C2 August 1990	0.4 °C17 December 1990	13.8 °C	694 mm	2	0
1989	28.9 °C20 June 1989	0.7 °C26 November 1989	13.8 °C	578 mm	0	0
1988	25.6 °C7 September 1988	0.8 °C23 November 1988	13.1 °C	867 mm	0	0
1987	30.0 °C16 August 1987	-8.2 °C12 January 1987	12.1 °C	648 mm	1	22
1986	26.2 °C26 June 1986	-7.1 °C10 February 1986	12.0 °C	881 mm	0	13
1985	28.9 °C13 July 1985	-7.4 °C8 January 1985	12.1 °C	725 mm	0	17
1984	27.1 °C19 August 1984	0.1 °C10 March 1984	12.7 °C	975 mm	0	0
1983	31.0 °C11 July 1983	-1.0 °C10 February 1983	12.9 °C	764 mm	1	5
1982	28.8 °C8 July 1982	0.8 °C7 January 1982	13.3 °C	967 mm	0	0
1981	28.7 °C4 August 1981	-0.3 °C19 February 1981	12.6 °C	946 mm	0	3
1980	25.1 °C24 July 1980	-2.4 °C14 January 1980	11.9 °C	784 mm	0	11
1979	25.1 °C26 July 1979	-1.7 °C2 January 1979	12.4 °C	910 mm	0	5
1978	25.1 °C16 July 1978	-1.6 °C11 February 1978	12.4 °C	855 mm	0	4
1977	22.8 °C11 September 1977	-1.5 °C30 November 1977	12.5 °C	954 mm	0	2
1976	30.5 °C28 June 1976	-0.8 °C26 December 1976	13.0 °C	730 mm	3	4
1975	30.3 °C2 August 1975	-0.3 °C19 December 1975	12.6 °C	724 mm	2	2
1974	25.5 °C15 August 1974	1.3 °C2 January 1974	12.6 °C	862 mm	0	0
1973	28.9 °C13 August 1973	-1.1 °C3 December 1973	12.3 °C	645 mm	0	2
1972	24.2 °C15 July 1972	-2.2 °C31 January 1972	12.1 °C	795 mm	0	3
1971	28.2 °C8 July 1971	-3.9 °C7 March 1971	12.6 °C	711 mm	0	9
1970	28.1 °C6 July 1970	-2.6 °C26 December 1970	12.4 °C	797 mm	0	10
1969	27.0 °C7 August 1969	-4.1 °C16 February 1969	12.5 °C	836 mm	0	8
1968	28.8 °C30 June 1968	-0.9 °C10 January 1968	12.6 °C	835 mm	0	3
1967	24.8 °C11 July 1967	-2.7 °C8 January 1967	12.6 °C	827 mm	0	4
1966	26.5 °C7 September 1966	-5.1 °C16 January 1966	12.9 °C	1,096 mm	0	8
1965	25.2 °C12 August 1965	-1.2 °C3 March 1965	12.2 °C	1,027 mm	0	3
1964	27.2 °C16 July 1964	-2.7 °C29 December 1964	12.4 °C	655 mm	0	11
1963	27.4 °C30 July 1963	-7.6 °C19 January 1963	11.4 °C	748 mm	0	39
1962	26.4 °C2 September 1962	-4.5 °C25 December 1962	12.0 °C	666 mm	0	8
1961	28.4 °C31 August 1961	-1.0 °C19 December 1961	13.5 °C	751 mm	0	4
1960	27.5 °C19 June 1960	-3.8 °C16 January 1960	12.9 °C	1,088 mm	0	10
1959	29.0 °C4 July 1959	0.1 °C2 February 1959	13.7 °C	794 mm	0	0
1958	24.9 °C9 August 1958	-1.3 °C11 March 1958	12.5 °C	984 mm	0	1
1957	29.1 °C3 August 1957	-2.3 °C18 January 1957	12.7 °C	725 mm	0	5
1956	25.7 °C26 July 1956	-7.1 °C3 February 1956	11.6 °C	534 mm	0	24
1955	29.7 °C21 August 1955	-1.0 °C3 January 1955	12.8 °C	671 mm	0	4
1954	24.8 °C31 August 1954	-7.5 °C1 February 1954	12.2 °C	692 mm	0	11
1953	28.4 °C11 August 1953	-1.4 °C16 January 1953	12.5 °C	509 mm	0	9
1952	32.2 °C30 June 1952	-1.1 °C25 January 1952	12.7 °C	958 mm	1	2
1951	27.6 °C29 July 1951	0.7 °C30 January 1951	12.7 °C	924 mm	0	0
1950	25.9 °C5 June 1950	-2.8 °C20 January 1950	12.8 °C	903 mm	0	11
1949	29.8 °C11 July 1949	-1.0 °C3 February 1949	13.7 °C	632 mm	0	1
1948	26.7 °C27 July 1948	-4.7 °C21 February 1948	13.0 °C	815 mm	0	7
1947	29.1 °C1 August 1947	-5.9 °C28 January 1947	13.2 °C	545 mm	0	15
1946	28.9 °C1 July 1946	-5.5 °C21 December 1946	12.3 °C	639 mm	0	15
1945	29.6 °C21 July 1945	-4.8 °C12 January 1945	13.2 °C	577 mm	0	15
1944	28.9 °C14 August 1944	-1.7 °C25 December 1944	12.6 °C	596 mm	0	15
1943	30.5 °C30 July 1943	-0.3 °C12 December 1943	13.2 °C	610 mm	1	1
1942	27.9 °C31 July 1942	-4.4 °C11 January 1942	12.2 °C	542 mm	0	21
1941	28.9 °C24 July 1941	-5.3 °C15 January 1941	11.9 °C	651 mm	0	18
1940	27.8 °C7 June 1940	-7.2 °C20 January 1940	12.2 °C	726 mm	0	29

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?

Year

Across the whole year

Average daily high

16.4 °C

+1.5 °C

Hot days (≥ 30 °C)

2 d/yr

Frost days (< 0 °C)

1 d/yr

-6

Annual rainfall

821 mm

+42 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	9.9 °C	+1.0 °C	192 mm	+104 mm
Feb	10.0 °C	+0.8 °C	63 mm	-6 mm
Mar	12.4 °C	+1.3 °C	27 mm	-33 mm
Apr	15.8 °C	+2.6 °C	86 mm	+35 mm
May	17.9 °C	+1.7 °C	29 mm	-27 mm
Jun	22.4 °C	+3.2 °C	26 mm	-14 mm
Jul	22.2 °C	+1.2 °C	53 mm	+19 mm
Aug	23.3 °C	+2.2 °C	18 mm	-22 mm
Sep	19.4 °C	-0.2 °C	61 mm	+7 mm
Oct	17.6 °C	+1.1 °C	76 mm	-9 mm
Nov	14.3 °C	+1.9 °C	90 mm	-12 mm
Dec	11.2 °C	+1.3 °C	100 mm	+1 mm

The year's extremes

Hottest day

33.0 °C

15 Aug 2025

Coldest day

-0.4 °C

14 Jan 2025

Wettest day

24.8 mm

10 Jan 2025

Windiest day

60.3 km/h

26 Jan 2025

Strongest gust

101.2 km/h

23 Oct 2025

Hottest feels-like

34.2 °C

15 Aug 2025

Coldest feels-like

-5.5 °C

25 Dec 2025

Snowiest day

0.2 cm

25 Dec 2025

Sunniest day

15.4 h

16 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Olonne-sur-Mer?

Olonne-sur-Mer has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.9 °C and it receives 779 mm of precipitation per year.

What is the hottest day ever recorded in Olonne-sur-Mer?

The hottest day measured in Olonne-sur-Mer between 1940 and 2025 was 17 June 2022, reaching 33.7 °C.

What is the coldest day in Olonne-sur-Mer?

The coldest day measured in Olonne-sur-Mer between 1940 and 2025 was 12 January 1987, at -8.2 °C.

Does it snow in Olonne-sur-Mer?

Yes. Olonne-sur-Mer gets on average 1.6 cm of snow per year and has around 7 frost days.

Has the climate of Olonne-sur-Mer warmed?

Yes: Olonne-sur-Mer warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Olonne-sur-Mer?

The wettest day measured in Olonne-sur-Mer between 1940 and 2025 was 28 September 1991, with 50 mm of rain in 24 hours.

What was the windiest day in Olonne-sur-Mer?

The windiest day measured in Olonne-sur-Mer between 1940 and 2025 was 27 December 1999, with winds reaching 88.7 km/h.

What is the warmest month in Olonne-sur-Mer?

The warmest month in Olonne-sur-Mer is August (19.0 °C on average); the coldest is January (7.3 °C).

How much does it rain in Olonne-sur-Mer?

Olonne-sur-Mer receives on average 779 mm of precipitation per year, spread over about 127 rainy days.

Is it sunny in Olonne-sur-Mer?

Olonne-sur-Mer gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

What is the biggest single-day snowfall in Olonne-sur-Mer?

The heaviest 24-hour snowfall measured in Olonne-sur-Mer between 1940 and 2025 was 26 January 1945, with 10.9 cm.

Are there tropical nights in Olonne-sur-Mer?

Yes: Olonne-sur-Mer has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Olonne-sur-Mer?

In Olonne-sur-Mer, between 1940 and 2025, the highest apparent temperature reached 35.3 °C on 10 August 2003, and the lowest was -16.9 °C on 12 January 1987.

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