Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 27.5 °C | 27.3 °C | 27 days | Unfavourable season |
| February | 27.5 °C | 27.3 °C | 24 days | Unfavourable season |
| March | 28.1 °C | 27.6 °C | 27 days | Unfavourable season |
| April | 28 °C | 27.8 °C | 28 days | Unfavourable season |
| May | 28 °C | 28.1 °C | 30 days | Unfavourable season |
| June | 28.2 °C | 28.5 °C | 29 days | Unfavourable season |
| July | 28.9 °C | 28.6 °C | 29 days | Unfavourable season |
| August | 30.1 °C | 28.5 °C | 22 days | Unfavourable season |
| September | 31.1 °C | 28.4 °C | 15 days | Possible, with trade-offs |
| October | 31 °C | 28.5 °C | 15 days | Possible, with trade-offs |
| November | 29.5 °C | 28.3 °C | 23 days | Unfavourable season |
| December | 28 °C | 27.8 °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 90 days. Passport valid for at least 3 months. FCDO applies the France (Schengen) page: passport issued less than 10 years before arrival and valid 3 months after leaving; EES biometrics at the border.
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
CDC level 2 notice: Chikungunya
Vaccines · hepatitis A and hepatitis B if you are not already vaccinated; chikungunya depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · Vaccine recommended for the whole country. Vaccination certificate required on entry for all travellers.
Malaria · Present. Areas: Areas associated with gold mining, primarily the communes near the border with Brazil and Suriname, especially Régina and Saint-Georges-de-l’Oyapock; also, the communes of Kourou, Matoury, and Saint-Élie No malaria transmission in coastal areas west of Kourou No malaria transmission in Cayenne City (the capital). Preventive medication recommended: Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine — prescribed before departure.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
Per the CDC (page reviewed 3 September 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 Cayenne in August?
The sea averages 28.5°C in August — yes, pleasant swimming.
How hot is Cayenne in August?
Expect 30.1°C in the afternoon and 23.8°C at night, averaged over the last 10 years.
Does it rain a lot in Cayenne in August?
Around 22 days with rain (≥ 1 mm) in the month — 71% of days.