Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 3.6 °C | — | 14 days | Unfavourable season |
| February | 6.2 °C | — | 12 days | Unfavourable season |
| March | 8.3 °C | — | 14 days | Unfavourable season |
| April | 11.9 °C | — | 14 days | Unfavourable season |
| May | 15.3 °C | — | 19 days | Unfavourable season |
| June | 20.5 °C | — | 18 days | Possible, with trade-offs |
| July | 23.2 °C | — | 14 days | Possible, with trade-offs |
| August | 22.8 °C | — | 13 days | Pleasant — a good time to go |
| September | 18.3 °C | — | 13 days | Possible, with trade-offs |
| October | 15.1 °C | — | 12 days | Possible, with trade-offs |
| November | 8.7 °C | — | 14 days | Unfavourable season |
| December | 5.2 °C | — | 14 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
France 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 Chamonix-Mont-Blanc in August?
Chamonix-Mont-Blanc is not a seaside destination (no sea data).
How hot is Chamonix-Mont-Blanc in August?
Expect 22.8°C in the afternoon and 12.7°C at night, averaged over the last 10 years.
Does it rain a lot in Chamonix-Mont-Blanc in August?
Around 13 days with rain (≥ 1 mm) in the month — 42% of days.