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Weather & Climate in Cayenne, French Guiana
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Cayenne has a warm climate with an average annual temperature of 79°F (26°C). Winters average 78°F in January while summers reach 78°F in July / relatively mild seasonal variation. The area gets 142 sunny days per year, below the national average of 205. Annual precipitation totals 114.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 23 feet.
Temperature
78°F Jan (25°C)
78°F Jul (26°C)
| Annual Average | 78.5°F |
| 45% above US avg | |
| January Average | 78°F (25°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 142 days/yr |
Geography
| Elevation | 23 ft (7 m) |
| Area | 9.1 sq mi (23.6 km²) |
| Population Density | 6,756/sq mi |
| Coordinates | 4.9381°N, 52.3346°W |
| Timezone | America/Cayenne |
Precipitation & Snow
Air Quality
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Jun 8, 2006 | 48 km E of Roura, French Guiana | M5.0 | 57 km | 10 km |
| Sep 29, 2017 | 19 km E of Kourou, French Guiana | M3.4 | 32 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 78°F (25°C) | 13.3 in | Coldest |
| February | 78°F (25°C) | 9.6 in | |
| March | 78°F (26°C) | 11.1 in | |
| April | 79°F (26°C) | 12.9 in | |
| May | 78°F (26°C) | 17.6 in | Wettest |
| June | 78°F (25°C) | 14.4 in | |
| July | 78°F (26°C) | 8.6 in | |
| August | 79°F (26°C) | 4.3 in | |
| September | 80°F (26°C) | 2.5 in | Driest |
| October | 80°F (27°C) | 3.0 in | Warmest |
| November | 79°F (26°C) | 5.2 in | |
| December | 78°F (26°C) | 11.7 in |
Cayenne has a seasonal temperature swing of 2°F / from 78°F in January to 80°F in October. Total annual precipitation is 114.2 inches, with May being the wettest month (17.6") and September the driest (2.5").