Cayenne (French Guiana) weather by month
The best time to visit Cayenne (French Guiana) is August to October — 73/100 in September, 32°C and 11 rainy days. The best season is the dry season, August to November (69/100 on average).
The worst month is May at 49/100 — hot, soaked, clean air. See May →
Updated September 2026 · climate normals from ERA5 reanalysis
Best season: August to November (69/100 on average) · worst May (49/100)
- Days
- 32°C
- Nights
- 25°C
- Wet days
- 11
- Sun
- 10.9 h
- Humidity
- 77%
- Daylight
- 12 h
Cayenne, month by month
Comfort score out of 100 for the kind of trip Cayenne is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
What's on in Cayenne through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Cayenne in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Busyschool holidays in 2 of the markets that fill it, one of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Traveller notes on Cayenne
What people who have been say about the place — the year-round notes first, then month by month.
Forum posters visiting Cayenne describe French Guiana as consistently hot and humid, though several are careful to note it wasn't as brutal as a Florida summer despite the tropical setting. One reviewer visiting Devil's Island specifically called the historical site fascinating but genuinely hot and humid, a pattern posters describe as fairly constant across the destination rather than tied to any one month. Given the limited destination-specific detail for March exactly, this note leans on French Guiana's broader equatorial pattern: March sits within the wetter half of the year here, with substantial rainfall and high humidity typical of this stretch of the northern South American coast. Posters generally rate March as hot, humid and genuinely wet for Cayenne, in line with the destination's consistently tropical character.
Forum posters describe French Guiana's climate in blunt terms - extremely hot and humid - though one visitor specifically compared it favorably to a Florida summer, finding it not quite as bad as expected. Posters describe nearby Devil's Island as a fascinating historical site despite the genuinely intense heat and humidity on site. Posters note at least one trip specifically planned for the August-September stretch, paired with neighboring Suriname and Guyana, suggesting this window is a workable time for a wider Guianas itinerary. Given the limited detailed trip reports available for Cayenne specifically, posters generally describe France's infrastructure standards - European-caliber hotels, restaurants and medical care - as a real practical upside for visitors regardless of exactly which month they choose.
Add your own note from Cayenne's card on the map.