Weather in Florence in September

How September compares

September is the 4th warmest month of the year in Florence and ranks 95th of 134 destinations we compare for September - see where else is hot in September. Within Italy it is 6th of 16 (Italy in September). Against London's average high of 18.6°C in September, Florence is 6.1°C warmer by day and 3.4°C warmer at night.

Daytime and night-time in September

The typical September day in Florence peaks at 24.7°C, but that is an average: the warmest 10% of days reach 29.6°C or more. Roughly 1 in 2 days top 25°C and 1 in 12 pass 30°C. Nights average 14.6°C; one night in ten drops to 10.5°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 33.2°C (2006-09-06) and the coldest night 4.5°C (1995-09-30).

Rain in September

Wet (more than 8 rainy days): about 9 days with 1 mm or more, 85 mm in total. Year to year it varies a lot - the wettest September was 2001 with 162 mm, the driest 2003 with 25 mm. Humidity averages 71%.

Sunshine and daylight

Around 6.9 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:54 and sets about 19:26 local time in mid-September. Average cloud cover is 43%.

Is September a good time to visit Florence?

Yes - it is one of the better months: warm days, manageable rain. The best months for Florence on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug.

Warm days, with a reason to pack layers

Florence should feel noticeably warmer than London in September, making it a good choice if you still want warmth for spending time outdoors. Light, breathable clothing is a sensible daytime starting point, but the average high does not rule out a hot afternoon. On warmer days, put longer walks earlier in the day and leave room for a shaded break around midday. After dark, keep a jumper or light jacket handy rather than assuming daytime clothes will be enough. The coldest 10% of nights reach 10.5°C or lower, so a useful outer layer matters particularly if you expect to be out late or leave early.

Enough sunshine for outdoor plans, but rain is the catch

September gives you about 6.9 hours of sunshine a day within 12.3 hours of daylight, so there is a useful amount of bright weather to work with. That is not a promise of clear skies all day, and about 9 rainy days make waterproof clothing a practical choice rather than spare baggage. Pack a light waterproof and shoes you are comfortable wearing on wet pavements. Keep your schedule flexible enough to move outdoor time into brighter spells, with indoor breaks when rain arrives. This is a reasonable trade-off if warmth matters more to you than staying dry, but less suitable if your plans depend entirely on being outside.