Weather in Nice in September

Prime time. If you get to pick your dates, September is the one. Highs average 23 °C, lows 20.8 °C, and rain falls on 7 days — nothing in the month is working against you.

September ranks 4 of 12 in Nice: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 7 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 2.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 28.2 °C and the coldest night fell to 14.6 °C, and the wettest single day dropped 47 mm — roughly 100% of the month's rain in one day.

September is moderately variable: 15 mm in the driest year against 112 mm in the wettest, around an average of 47 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 10.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 72%.

How September sits in the year

The month is on the way down: 2.8 °C cooler than August, with October dropping another 3.3 °C. The first week and the last are not the same trip.

Daylight in September

12.6 hours of daylight, losing 1.5 hours across the month. That is between Nice's extremes of 15.4 and 9 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 22 °C in September — comfortable for a proper swim. This is the warmest the water gets all year.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Nice versus nearby

If Nice is one option among several, the nearby comparison is worth making. Genoa is close enough to be a coin toss — 3.4 °C warmer, 2 days more rain. Marseille is close enough to be a coin toss — 4.7 °C warmer, 1 day less rain.

So: September works, with July the better month by 7 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Nice

See all twelve months in Nice, or where else to go in September.