Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 9.3 °C | 9.3 °C | 13 days | Unfavourable season |
| February | 10.6 °C | 9.2 °C | 11 days | Unfavourable season |
| March | 12.4 °C | 10.2 °C | 14 days | Possible, with trade-offs |
| April | 15.4 °C | 12.5 °C | 9 days | Possible, with trade-offs |
| May | 18.6 °C | 14.8 °C | 12 days | Possible, with trade-offs |
| June | 21.9 °C | 17.4 °C | 11 days | Pleasant — a good time to go |
| July | 23.5 °C | 18.7 °C | 9 days | Pleasant — a good time to go |
| August | 23.5 °C | 18.8 °C | 9 days | Pleasant — a good time to go |
| September | 21.3 °C | 17.6 °C | 11 days | Pleasant — a good time to go |
| October | 17.5 °C | 16.1 °C | 12 days | Possible, with trade-offs |
| November | 13.2 °C | 13.7 °C | 12 days | Possible, with trade-offs |
| December | 10.8 °C | 10.6 °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 Saint-Nazaire in January?
The sea averages 9.3°C in January — too cold for most swimmers.
How hot is Saint-Nazaire in January?
Expect 9.3°C in the afternoon and 4.9°C at night, averaged over the last 10 years.
Does it rain a lot in Saint-Nazaire in January?
Around 13 days with rain (≥ 1 mm) in the month — 43% of days.