Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 28.7 °C | 28.1 °C | 23 days | Unfavourable season |
| February | 28.5 °C | 28.3 °C | 21 days | Unfavourable season |
| March | 28.6 °C | 28.4 °C | 21 days | Unfavourable season |
| April | 27.8 °C | 27.9 °C | 18 days | Unfavourable season |
| May | 26.1 °C | 26.8 °C | 12 days | Ideal — one of the best times of year |
| June | 24.4 °C | 25.3 °C | 11 days | Ideal — one of the best times of year |
| July | 23.9 °C | 24.2 °C | 7 days | Ideal — one of the best times of year |
| August | 24.1 °C | 23.8 °C | 9 days | Ideal — one of the best times of year |
| September | 25 °C | 24.1 °C | 9 days | Ideal — one of the best times of year |
| October | 25.9 °C | 24.7 °C | 13 days | Ideal — one of the best times of year |
| November | 27 °C | 26 °C | 15 days | Possible, with trade-offs |
| December | 28.4 °C | 27.4 °C | 18 days | Possible, with trade-offs |
Nearby in December
Before you go
Three things to check once you have picked your dates.
Entry
No visa needed for stays of up to 90 days. Passport valid for at least 3 months. Schengen rules: passport issued less than 10 years ago, valid 3 months after leaving Schengen; insurance, funds and accommodation may be checked.
For a British passport, per the UK Foreign Office on 11 August 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 11 August 2026
Health
Vaccines · hepatitis A and hepatitis B if you are not already vaccinated. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · None.
Mosquitoes · dengue reported: protect yourself from bites.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Saint-Denis in December?
The sea averages 27.4°C in December — yes, pleasant swimming.
How hot is Saint-Denis in December?
Expect 28.4°C in the afternoon and 24°C at night, averaged over the last 10 years.
Does it rain a lot in Saint-Denis in December?
Around 18 days with rain (≥ 1 mm) in the month — 58% of days.