Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 11.2 °C | 13.2 °C | 6 days | Unfavourable season |
| February | 13.3 °C | 12.6 °C | 6 days | Possible, with trade-offs |
| March | 16 °C | 13.3 °C | 6 days | Possible, with trade-offs |
| April | 18.8 °C | 14.8 °C | 8 days | Possible, with trade-offs |
| May | 22.5 °C | 17.1 °C | 8 days | Pleasant — a good time to go |
| June | 27.7 °C | 20.9 °C | 5 days | Ideal — one of the best times of year |
| July | 31.3 °C | 22.4 °C | 2 days | Ideal — one of the best times of year |
| August | 30.5 °C | 22.8 °C | 3 days | Ideal — one of the best times of year |
| September | 25.9 °C | 21.7 °C | 6 days | Ideal — one of the best times of year |
| October | 21.1 °C | 19.2 °C | 8 days | Pleasant — a good time to go |
| November | 15.6 °C | 17.1 °C | 10 days | Possible, with trade-offs |
| December | 12.6 °C | 14.3 °C | 7 days | Possible, with trade-offs |
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 Istres in July?
The sea averages 22.4°C in July — swimming is possible but brisk.
How hot is Istres in July?
Expect 31.3°C in the afternoon and 20.7°C at night, averaged over the last 10 years.
Does it rain a lot in Istres in July?
Around 2 days with rain (≥ 1 mm) in the month — 6% of days.