Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 28.6 °C | 29.2 °C | 27 days | Unfavourable season |
| February | 28.7 °C | 29.4 °C | 25 days | Unfavourable season |
| March | 29.2 °C | 29.8 °C | 26 days | Unfavourable season |
| April | 29.2 °C | 29.8 °C | 20 days | Unfavourable season |
| May | 28.4 °C | 28.6 °C | 11 days | Ideal — one of the best times of year |
| June | 27.4 °C | 27.5 °C | 7 days | Ideal — one of the best times of year |
| July | 26.6 °C | 26.4 °C | 6 days | Ideal — one of the best times of year |
| August | 26.9 °C | 26.1 °C | 11 days | Ideal — one of the best times of year |
| September | 27.4 °C | 26.3 °C | 14 days | Possible, with trade-offs |
| October | 28.1 °C | 27.1 °C | 17 days | Possible, with trade-offs |
| November | 28.7 °C | 28.1 °C | 20 days | Unfavourable season |
| December | 29.1 °C | 29.2 °C | 23 days | Unfavourable season |
Nearby in August
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. French overseas department (EU): visa-free up to 90 days; passport valid at least 3 months after your planned departure.
For a British passport, per the UK Foreign Office on 10 December 2025. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 10 December 2025
Health
CDC level 2 notice: Malaria
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. Certificate required only if you arrive from a country with yellow fever risk.
Malaria · Present. Areas: All. Although malaria was previously controlled, an increasing number of locally acquired cases are being reported.. Preventive medication recommended: Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine — prescribed before departure.
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 Mamoudzou in August?
The sea averages 26.1°C in August — yes, pleasant swimming.
How hot is Mamoudzou in August?
Expect 26.9°C in the afternoon and 22.2°C at night, averaged over the last 10 years.
Does it rain a lot in Mamoudzou in August?
Around 11 days with rain (≥ 1 mm) in the month — 35% of days.