Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 27.7 °C | 29.6 °C | 29 days | Unfavourable season |
| February | 28.1 °C | 29.6 °C | 25 days | Unfavourable season |
| March | 28.3 °C | 29.8 °C | 27 days | Unfavourable season |
| April | 28.8 °C | 30.1 °C | 21 days | Unfavourable season |
| May | 28 °C | 29.5 °C | 14 days | Ideal — one of the best times of year |
| June | 27 °C | 28.3 °C | 10 days | Ideal — one of the best times of year |
| July | 26.6 °C | 27.1 °C | 7 days | Ideal — one of the best times of year |
| August | 26.9 °C | 26.8 °C | 11 days | Ideal — one of the best times of year |
| September | 27.4 °C | 27.1 °C | 14 days | Possible, with trade-offs |
| October | 28.4 °C | 27.9 °C | 18 days | Possible, with trade-offs |
| November | 28.6 °C | 28.9 °C | 25 days | Unfavourable season |
| December | 28.4 °C | 29.6 °C | 29 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 15 days. Passport valid for at least 6 months. 10-euro fee on arrival for the visa-free 15 days; longer stays: 30- or 60-day tourist visa bought on arrival (cash), extendable to 90 days in total.
For a British passport, per the UK Foreign Office on 9 September 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 9 September 2026
Health
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; rabies depending on activities and areas visited. 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; except in Antananarivo (the capital) where malaria transmission is rare. Preventive medication recommended: All areas (except the city of Antananarivo): Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine Antananarivo: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only) — prescribed before departure.
Mosquitoes · dengue and Zika 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 Nosy Be in August?
The sea averages 26.8°C in August — yes, pleasant swimming.
How hot is Nosy Be in August?
Expect 26.9°C in the afternoon and 21.3°C at night, averaged over the last 10 years.
Does it rain a lot in Nosy Be in August?
Around 11 days with rain (≥ 1 mm) in the month — 36% of days.