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La Seyne-sur-Mer, Provence-Alpes-Côte d'Azur climate

Csa Hot-summer Mediterranean

La Seyne-sur-Mer has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is August with an average daily high near 83°F, while the coldest is January averaging around 43°F at night. Precipitation totals about 22 inches a year and is strongly seasonal — November alone averages 3.5 inches while July barely receives 0.23 inches.

☀️ Summers

Warm

Highs near 83°F in August.

About 5 days a year above 90 °F

❄️ Winters

Cool

Lows near 43°F in January.

About 1 freezing nights a year

🌧️ Rain

Fairly dry

About 22 in of rain a year.

Wettest in November

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+1.0 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

La Seyne-sur-Mer climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	54	54	59	63	70	78	83	83	76	68	60	55
Avg temp (°F)	48	49	53	57	63	70	75	76	69	62	55	50
Avg low (°F)	43	43	46	50	56	63	67	68	62	57	50	45
Precipitation (in)	2.4	1.6	2.0	2.0	1.4	0.7	0.2	0.3	2.0	3.1	3.5	2.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	54	54	59	63	70	78
Avg temp (°F)	48	49	53	57	63	70
Avg low (°F)	43	43	46	50	56	63
Precipitation (in)	2.4	1.6	2.0	2.0	1.4	0.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	83	83	76	68	60	55
Avg temp (°F)	75	76	69	62	55	50
Avg low (°F)	67	68	62	57	50	45
Precipitation (in)	0.2	0.3	2.0	3.1	3.5	2.5

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	7	7	8	7	4	3	3	5	8	10	9
Days with high ≥ 90°F (days)	—	—	—	—	—	0.6	2	2	0.1	—	—	—
Days with low ≤ 32°F (days)	0.4	0.7	0.0	—	—	—	—	—	—	—	0.0	0.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	7	7	8	7	4
Days with high ≥ 90°F (days)	—	—	—	—	—	0.6
Days with low ≤ 32°F (days)	0.4	0.7	0.0	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	3	5	8	10	9
Days with high ≥ 90°F (days)	2	2	0.1	—	—	—
Days with low ≤ 32°F (days)	—	—	—	—	0.0	0.3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	53	50	50	52	52	41	29	35	43	55	55	54
Clear days (≤ 30% cloud)	9	9	10	10	10	13	19	16	13	9	8	9
Partly cloudy days (30–70%)	10	10	11	10	10	11	10	10	10	11	11	11
Cloudy days (≥ 70%)	11	9	10	11	11	6	3	4	7	12	11	11
Relative humidity (%)	79	78	78	78	78	75	72	73	75	80	79	79
Wind speed (mph)	12.5	12.6	12.1	11.3	10.1	9.4	9.9	9.4	10.2	11.4	12.6	13.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	53	50	50	52	52	41
Clear days (≤ 30% cloud)	9	9	10	10	10	13
Partly cloudy days (30–70%)	10	10	11	10	10	11
Cloudy days (≥ 70%)	11	9	10	11	11	6
Relative humidity (%)	79	78	78	78	78	75
Wind speed (mph)	12.5	12.6	12.1	11.3	10.1	9.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	29	35	43	55	55	54
Clear days (≤ 30% cloud)	19	16	13	9	8	9
Partly cloudy days (30–70%)	10	10	10	11	11	11
Cloudy days (≥ 70%)	3	4	7	12	11	11
Relative humidity (%)	72	73	75	80	79	79
Wind speed (mph)	9.9	9.4	10.2	11.4	12.6	13.1

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Cap Cepet, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →