Weather in Nice in September

How September compares

September is the 4th warmest month of the year in Nice and ranks 119th of 134 destinations we compare for September - see where else is hot in September. Within France it is 1st of 2 (France in September). Against London's average high of 18.6°C in September, Nice is 5.0°C warmer by day and 6.2°C warmer at night.

Daytime and night-time in September

The typical September day in Nice peaks at 23.6°C, but that is an average: the warmest 10% of days reach 26.9°C or more. Roughly 1 in 3 days top 25°C and 1 in 500 pass 30°C. Nights average 17.4°C; one night in ten drops to 14.5°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 31.6°C (2017-09-01) and the coldest night 8.5°C (2007-09-28).

Rain in September

Some rain (4-8 rainy days): about 8 days with 1 mm or more, 74 mm in total. Year to year it varies a lot - the wettest September was 1993 with 227 mm, the driest 1997 with 6 mm. Humidity averages 75%.

Sea temperature in September

The sea averages 22.7°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.3°C to 23.9°C. For the warmest sea here, come in August (24.8°C).

Sunshine and daylight

Around 6.8 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 07:10 and sets about 19:42 local time in mid-September. Average cloud cover is 45%.

Is September a good time to visit Nice?

It is a reasonable choice: warm days. The best months for Nice on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.

Warm days, with a layer for evenings

Light clothes should work well during the day, but bring a jumper or light jacket for evenings rather than packing only summer outfits. The warmest days reach around 27°C or more, so shade and a slower pace at midday can still appeal. Humidity averages 75%, which may make the warmth feel a little sticky. At the cooler end, nights can fall to around 15°C or below, making that extra layer useful if you stay out late. September is a sensible choice if you like warmth without needing very hot weather; it is less convincing if your main aim is dependable heat from morning through evening.

Swimming is appealing, but keep plans flexible

The sea averages 22.7°C, warm enough for swimming, though your comfort will still depend on how readily you feel the cold. Its year-to-year range of 21°C to 24°C means you should not expect exactly the same swimming conditions every September. On land, about 6.8 hours of sunshine a day leaves plenty of scope for outdoor plans, but it does not mean uninterrupted clear skies. There are about 8 rainy days during the month, so a lightweight waterproof is a more useful precaution than assuming you can leave rainwear at home. Keep swimming and other outdoor plans flexible around the forecast. The balance is favourable for a varied city holiday, with rain a practical consideration rather than a reason to rule September out.