This post may contain affiliate links. If you purchase through them, I may earn a small commission at no extra cost to you. Thanks for supporting our small business.
La Rochelle has a temperate oceanic climate (Cfb) with strong maritime influences from the Bay of Biscay. Winters are mild but damp, summers are warm and relatively dry, and the city enjoys around 2,250 hours of sunshine annually — one of the highest totals on France’s Atlantic coast. Rain falls year-round, with autumn and winter being the wettest seasons. The sea temperature ranges from 10°C (50°F) in February to 20°C (68°F) in August, making swimming a summer-only activity for most visitors.
La Rochelle Weather in January
January is the coldest month, averaging 6°C (43°F) with highs of 9°C (48°F) and lows of 4°C (39°F). Expect 75mm of rain spread over 12-14 wet days, though downpours tend to be light and drizzly rather than stormy. Sunshine is limited to about 80 hours for the month — roughly 2-3 hours per day. Sea temperature drops to 10°C (50°F). Pack a waterproof jacket, warm layers, and sturdy shoes for slippery cobblestones in the Old Port.
La Rochelle Weather in February
Temperatures creep up slightly to an average of 7°C (45°F), with highs of 10°C (50°F) and lows of 4°C (39°F). February sees less rain at 55-60mm over about 10-11 wet days. Sunshine increases to around 100 hours. The sea remains cold at 10°C (50°F). Mornings can be foggy, especially near the marinas. By late February, you’ll notice the first hints of spring — daffodils appearing in the parks and slightly longer daylight.
La Rochelle Weather in March
Spring begins with average temperatures reaching 9°C (48°F), highs of 13°C (55°F), and lows of 6°C (43°F). Rainfall is moderate at 55mm over 10-11 wet days. Sunshine jumps to about 150 hours. The sea is still chilly at 11°C (52°F), but the portside cafes start setting up outdoor tables on sunny days. A light jacket plus a scarf is usually enough during daylight hours, but evenings remain cool.
La Rochelle Weather in April
April brings real spring warmth: averages of 11°C (52°F), highs of 15°C (59°F), lows of 8°C (46°F). Expect 55-60mm of rain over 10 days, often as brief showers. Sunshine increases to roughly 190 hours. The sea warms to 12°C (54°F). This is a good month for walking tours and cycling, weather permitting, but bring a rain jacket — April showers are common and can arrive with little warning.
La Rochelle Weather in May
May is one of the best months to visit: average 15°C (59°F), highs of 19°C (66°F), lows of 11°C (52°F). Rainfall drops to 55-60mm over 9-10 wet days. Sunshine reaches about 230 hours — over 7 hours per day. The sea temperature inches up to 15°C (59°F). Outdoor dining on the Vieux Port is comfortable well into the evening. The city’s parks are in full bloom and the tourist crowds haven’t yet peaked.
La Rochelle Weather in June
Early summer: average 18°C (64°F), highs of 22°C (72°F), lows of 14°C (57°F). June is the start of the drier season with just 40-45mm of rain over 7-8 days. Sunshine peaks at about 255 hours (8.5 hours/day). Sea temperature reaches 17°C (63°F) — swimmable for the brave. Daylight stretches to nearly 16 hours around the solstice, giving you long evenings for harbour strolls and sunset drinks.
La Rochelle Weather in July
July is the warmest month alongside August: average 20°C (68°F), highs of 25°C (77°F), occasionally touching 30°C (86°F) during heatwaves, lows of 16°C (61°F). This is the driest month with only 35-40mm of rain over 6-7 days. Sunshine tops out at about 270 hours. Sea temperature reaches a pleasant 19-20°C (66-68°F). The city is busy with tourists and the Francofolies music festival draws huge crowds. Book accommodation well in advance.
La Rochelle Weather in August
Essentially identical to July: average 20°C (68°F), highs of 25°C (77°F), lows of 16°C (61°F). Rainfall remains low at 35-40mm over 6-7 days. Sunshine stays at roughly 250 hours. Sea temperature peaks at 20°C (68°F). August is the busiest tourist month as French families take their annual holiday. The beaches at Les Minimes and Chef de Baie are packed. Restaurants around the Vieux Port require reservations for dinner.
La Rochelle Weather in September
Early autumn delivers some of the most pleasant conditions: average 18°C (64°F), highs of 22°C (72°F), lows of 14°C (57°F). Rain picks up to 55-60mm over 8-9 days. Sunshine remains generous at roughly 200 hours. Sea temperature holds at 19°C (66°F) — still comfortable for swimming. The Grand Pavois boat show brings sailing enthusiasts in late September. Tourist crowds thin out after the first week, making this an excellent month to visit.
La Rochelle Weather in October
Autumn sets in properly: average 14°C (57°F), highs of 18°C (64°F), lows of 11°C (52°F). October is significantly wetter with 80-90mm of rain over 12-13 days. Sunshine drops to about 130 hours. Sea temperature falls to 16°C (61°F). Atlantic storms become more frequent, bringing gusty winds and heavier rain. The city’s autumn colours and quieter streets still make it worth visiting, but waterproof clothing is essential.
La Rochelle Weather in November
November is the wettest month with 90-95mm of rain over 14-15 days. Average temperatures drop to 9°C (48°F), with highs of 13°C (55°F) and lows of 6°C (43°F). Sunshine is limited to about 85 hours. The sea cools to 13°C (55°F). The Marathon de La Rochelle takes place in late November, drawing runners despite the damp conditions. The Christmas market setup begins in the last week, adding festive lights to the Old Port.
La Rochelle Weather in December
December brings winter chill: average 7°C (45°F), highs of 10°C (50°F), lows of 4°C (39°F). Rain totals 80-85mm over 13-14 days. Sunshine is at its lowest with roughly 75 hours. Sea temperature drops to 11°C (52°F). The Christmas market on the Place du Commandant de la Motte Rouge runs through most of the month. Snow is extremely rare — the city might see a dusting once every few years. Frost occurs on perhaps 15-20 mornings, mainly in the suburbs.
La Rochelle Weather by Month: Quick Reference
| Month | Avg High (°C) | Avg Low (°C) | Rain (mm) | Sun (hrs) | Sea (°C) |
|---|---|---|---|---|---|
| Jan | 9 | 4 | 75 | 80 | 10 |
| Feb | 10 | 4 | 60 | 100 | 10 |
| Mar | 13 | 6 | 55 | 150 | 11 |
| Apr | 15 | 8 | 60 | 190 | 12 |
| May | 19 | 11 | 60 | 230 | 15 |
| Jun | 22 | 14 | 45 | 255 | 17 |
| Jul | 25 | 16 | 40 | 270 | 20 |
| Aug | 25 | 16 | 40 | 250 | 20 |
| Sep | 22 | 14 | 60 | 200 | 19 |
| Oct | 18 | 11 | 85 | 130 | 16 |
| Nov | 13 | 6 | 90 | 85 | 13 |
| Dec | 10 | 4 | 85 | 75 | 11 |
