Weather in Sardinia in September

How September compares

September is the 4th warmest month of the year in Sardinia and ranks 80th of 134 destinations we compare for September - see where else is hot in September. Within Italy it is 2nd of 16 (Italy in September). Against London's average high of 18.6°C in September, Sardinia is 7.2°C warmer by day and 7.4°C warmer at night.

Daytime and night-time in September

The typical September day in Sardinia peaks at 25.8°C, but that is an average: the warmest 10% of days reach 29.2°C or more. About 64% of days top 25°C and 1 in 20 pass 30°C. Nights average 18.6°C; one night in ten drops to 16.0°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 35.4°C (2008-09-05) and the coldest night 12.2°C (2007-09-29).

Rain in September

Some rain (4-8 rainy days): about 6 days with 1 mm or more, 37 mm in total. Year to year it varies a lot - the wettest September was 2018 with 129 mm, the driest 2001 with 6 mm. Humidity averages 72%.

Sea temperature in September

The sea averages 23.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.7°C to 24.6°C. For the warmest sea here, come in August (25.2°C).

Sunshine and daylight

Around 7.8 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 07:03 and sets about 19:32 local time in mid-September. Average cloud cover is 36%.

Is September a good time to visit Sardinia?

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

Warm enough for summer clothes, with some hotter days

Daytime warmth is fairly reliable: 64% of days reach 25°C, so light clothing should earn its place in your luggage. Days reaching 30°C are much less common, at 5%, which suits travellers who want heat without making very hot weather the main feature of the trip. Still, the warmest days can feel demanding around midday, and humidity averages 72%. Keep shade breaks in mind rather than planning to be active throughout the afternoon. Nights average around 19°C, but cooler nights can fall to 16°C or below. A light jumper or jacket is a useful addition for sitting outside after dark.

Plenty of sunshine, but keep plans flexible

September offers about 7.8 hours of sunshine within 12.3 hours of daylight, giving you useful time outdoors without suggesting every day will be cloudless. The catch is rain: about 6 days have measurable rainfall, so a completely dry holiday is not something to bank on. That does not mean those days are washouts, but it does make a light waterproof and flexible beach plans sensible. If swimming and time outside are your priorities, use the forecast to choose your outings rather than fixing everything in advance. September suits travellers who can accept some unsettled weather in return for generally warm conditions.

The sea is still a strong reason to go

The sea averages 23.6°C, putting September firmly in swimming territory rather than making it a test of tolerance for cold water. The year-to-year range is 23°C to 25°C, so the appeal is not dependent on an unusually warm year. This makes the month a good fit if you prefer spending time in the water to simply sitting in the sun. Your comfort on the beach will still depend on the day's weather, so warm water should not be confused with guaranteed beach conditions. Bring swimwear alongside a light layer for afterwards, especially if you plan to stay out into the evening.