Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 9.8 °C | — | 9 days | Unfavourable season |
| February | 12 °C | — | 9 days | Unfavourable season |
| March | 14.3 °C | — | 9 days | Possible, with trade-offs |
| April | 18.1 °C | — | 9 days | Possible, with trade-offs |
| May | 21.9 °C | — | 13 days | Pleasant — a good time to go |
| June | 27.9 °C | — | 8 days | Ideal — one of the best times of year |
| July | 32 °C | — | 5 days | Ideal — one of the best times of year |
| August | 31.6 °C | — | 6 days | Ideal — one of the best times of year |
| September | 25.7 °C | — | 8 days | Ideal — one of the best times of year |
| October | 20.5 °C | — | 10 days | Pleasant — a good time to go |
| November | 14.6 °C | — | 11 days | Possible, with trade-offs |
| December | 11 °C | — | 10 days | Unfavourable season |
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 Siena in October?
Siena is not a seaside destination (no sea data).
How hot is Siena in October?
Expect 20.5°C in the afternoon and 11.1°C at night, averaged over the last 10 years.
Does it rain a lot in Siena in October?
Around 10 days with rain (≥ 1 mm) in the month — 31% of days.