Cayenne (French Guiana) weather in May

May in Cayenne: hot, soaked, with clean air — not the time — 30 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Cayenne French Guiana · Guianas & Northern Brazil · City49
  1. 60Jan
  2. 57Feb
  3. 63Mar
  4. 50Apr
  5. 49May
  6. 52Jun
  7. 58Jul
  8. 69Aug
  9. 73Sep
  10. 72Oct
  11. 63Nov
  12. 53Dec

#12 of 12 months in Cayenne · #1287 of 1413 destinations to visit in May · comfort 49/100 (tier F)

Days
28°C
Nights
24°C
Wet days
30
Sun
7.9 h
Humidity
90%
Daylight
12 h
Cayenne, French Guiana
Photo: Wilfried · Pexels

Traveller notes on Cayenne in May

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.
Tripadvisor community · March · 1 month ago · Read more on Tripadvisor ↗
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.
Tripadvisor community · September · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Cayenne's card on the map.

Cayenne climate normals — May

Daytime high28°C / 83°F🥵 hot
Nighttime low24°C / 75°F
Feels like (high)33°C / 91°F
Sea temperature29°C / 83°F♨️ bath-warm
Rainfall539 mm / 21.2 in⛈ soaked
Rainy days30 days
Humidity90%💦 very humid
Dew point24°C / 75°F
Sunshine7.9 h/day
Daylight12.3 h
Wind16 km/h / 10 mph
Air quality (US AQI)32🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Cayenne in May

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.

Quietone of its worst months for weather(estimated)

JFMAMJJASOND

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).

Toughest weatherCayenne's weather peaks August–October, best around September.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Cayenne in May

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Nature

    Leatherback nesting

    1 Mar – 31 Aug · usuallyTurtle nesting

    Leatherbacks 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

    Wet season

    MonsoonRisk

    30 rainy days and about 539 mm in the month — the real kind of rainy season, not afternoon showers.

    from the climate normals

What's on around the world in May →

Where is Cayenne?

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Cayenne in May — FAQ

Is May a good time to visit Cayenne?
May in Cayenne: hot, soaked, with clean air — not the time — 30 rainy days. It ranks #12 of 12 months for Cayenne on SeasonMap's comfort score (49/100).
What is the weather like in Cayenne in May?
In May, Cayenne averages a daily high of 28.3°C and a low of 23.7°C, with about 539.2 mm of rain over roughly 29.9 rainy days.
What is the air quality in Cayenne in May?
Cayenne has a mean US Air Quality Index of about 32 in May.