Cayenne (French Guiana) weather in August
August in Cayenne: sweltering, rainy, with clean air — fine if you can take 18 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#3 of 12 months in Cayenne · #941 of 1413 destinations to visit in August · comfort 69/100 (tier C)
- Days
- 31°C
- Nights
- 24°C
- Wet days
- 18
- Sun
- 10.8 h
- Humidity
- 81%
- Daylight
- 12 h

Traveller notes on Cayenne in August
Other months in Cayenne
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.
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Cayenne climate normals — August
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Cayenne in August
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.
Busyone of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Cayenne's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherCayenne's weather peaks August–October, best around September.
August includes Leatherback nesting.
Best weatherFair weatherToughest weather
What's on in Cayenne in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Leatherback nesting
1 Mar – 31 Aug · usuallyTurtle nestingLeatherbacks haul out at night on the beaches at Rémire-Montjoly and, in far greater numbers, on the reserve beaches west towards Awala-Yalimapo. Hatchlings run for the water from around June. Source ↗
- Season
The long dry season
15 Aug – 15 Nov · usuallyThe most settled months, when forest trails dry out and the rivers up to Amerindian and Maroon villages are easier going. The best window for the Iles du Salut and inland trips, though turtle nesting is over by then.
Where is Cayenne?
Cayenne in August — FAQ
- Is August a good time to visit Cayenne?
- August in Cayenne: sweltering, rainy, with clean air — fine if you can take 18 rainy days. It ranks #3 of 12 months for Cayenne on SeasonMap's comfort score (69/100).
- What is the weather like in Cayenne in August?
- In August, Cayenne averages a daily high of 30.5°C and a low of 23.9°C, with about 126 mm of rain over roughly 18.2 rainy days.
- What is the air quality in Cayenne in August?
- Cayenne has a mean US Air Quality Index of about 28 in August.