Cayenne weather by month & the best time to visit
🇬🇫 French Guiana · beach resort · tropical monsoon climate
The best time to visit Cayenne is September — its sunniest month (Sunshine Score 81/100), with October and August close behind. Cayenne averages about 2,049 hours of sunshine a year. Daytime highs around 29°C / 84°F and roughly 54 mm of rain in September.
Jump to: month-by-month table · sea temperature · nearby alternatives · embed this data
- Sun hours / year
- 2,049
- Sunniest month
- September
- Peak score
- 81/100
- Rain / year
- 2,872 mm
- Midday UV at peak
- 12 (extreme)
- Sea at warmest
- 31°C / 88°F
- Population
- 62k
- Elevation
- 5 m
When is the best time to visit Cayenne?
For sunshine, the best time to visit Cayenne is September, then October and August. The dullest month is January (63/100, 300 mm of rain). The full month-by-month picture is in the table below.
How sunny is Cayenne?
Cayenne gets a moderate 2,049 hours of sunshine a year. September (81/100) is noticeably better than January (63). It ranks #3 of 3 destinations in French Guiana for annual sunshine, below the national median of 2,290 hours. Rain has a clear season: the wettest stretch, around May, carries about 42% of the annual 2,872 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 63 | 27° / 81°F | 24° / 75°F | 300 mm | 8 | 29° / 84°F |
| February | 63 | 27° / 81°F | 24° / 75°F | 264 mm | 9 | 29° / 84°F |
| March | 63 | 28° / 82°F | 24° / 75°F | 250 mm | 9 | 30° / 86°F |
| April | 63 | 28° / 82°F | 25° / 77°F | 369 mm | 9 | 30° / 86°F |
| May | 63 | 28° / 82°F | 25° / 77°F | 504 mm | 8 | 29° / 84°F |
| June | 63 | 28° / 82°F | 25° / 77°F | 334 mm | 9 | 30° / 86°F |
| July | 63 | 28° / 82°F | 24° / 75°F | 217 mm | 10 | 30° / 86°F |
| August | 71 | 28° / 82°F | 25° / 77°F | 109 mm | 11 | 31° / 88°F |
| September | 81 | 29° / 84°F | 25° / 77°F | 54 mm | 12 | 31° / 88°F |
| October | 80 | 30° / 86°F | 25° / 77°F | 58 mm | 11 | 31° / 88°F |
| November | 71 | 29° / 84°F | 25° / 77°F | 110 mm | 10 | 30° / 86°F |
| December | 63 | 28° / 82°F | 25° / 77°F | 303 mm | 8 | 29° / 84°F |
Sea temperature in Cayenne by month
The sea off Cayenne is warmest in August at around 31°C / 88°F, and coolest in January at 29°C / 84°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Cayenne on the interactive sunshine globe →
Nearby places for sunshine
- Macapá Brazil · 549 km · best in Aug · 2,203 h sun/yr
- Georgetown Guyana · 678 km · best in Sep · 2,001 h sun/yr
- Belém Brazil · 813 km · best in Aug · 2,385 h sun/yr
- Santarém Brazil · 849 km · best in Sep · 2,281 h sun/yr
- Boa Vista Brazil · 950 km · best in Sep · 2,322 h sun/yr
- Port of Spain Trinidad & Tobago · 1,179 km · best in Mar · 2,546 h sun/yr
Nearest destinations
- Saint-Laurent-du-Maroni French Guiana · 199 km · 2,290 h sun/yr · best in Sep
- Maripasoula French Guiana · 227 km · 2,422 h sun/yr · best in Sep
- Moengo Suriname · 242 km · 2,290 h sun/yr · best in Sep
- Drietabbetje Suriname · 268 km · 2,385 h sun/yr · best in Sep
- Paramaribo Suriname · 321 km · 2,370 h sun/yr · best in Sep
Head-to-head
How Cayenne compares month by month: Cayenne vs Belém · Cayenne vs Macapá · Cayenne vs Georgetown · all comparisons
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