Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 14 °C | 15.1 °C | 8 days | Possible, with trade-offs |
| February | 14.8 °C | 14.4 °C | 7 days | Possible, with trade-offs |
| March | 16.3 °C | 14.4 °C | 7 days | Possible, with trade-offs |
| April | 19.2 °C | 15.7 °C | 7 days | Pleasant — a good time to go |
| May | 22.8 °C | 18 °C | 6 days | Pleasant — a good time to go |
| June | 28.1 °C | 21.9 °C | 3 days | Ideal — one of the best times of year |
| July | 31.6 °C | 25.2 °C | 0 day | Ideal — one of the best times of year |
| August | 31.1 °C | 26.6 °C | 2 days | Ideal — one of the best times of year |
| September | 27.7 °C | 25.4 °C | 5 days | Ideal — one of the best times of year |
| October | 23.4 °C | 22.6 °C | 6 days | Pleasant — a good time to go |
| November | 18.6 °C | 19.6 °C | 10 days | Possible, with trade-offs |
| December | 15.5 °C | 16.7 °C | 6 days | Possible, with trade-offs |
Before you go
Three things to check once you have picked your dates.
Entry
Italy is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 11 August 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Cagliari (Sardaigne) in September?
The sea averages 25.4°C in September — yes, pleasant swimming.
How hot is Cagliari (Sardaigne) in September?
Expect 27.7°C in the afternoon and 20°C at night, averaged over the last 10 years.
Does it rain a lot in Cagliari (Sardaigne) in September?
Around 5 days with rain (≥ 1 mm) in the month — 16% of days.