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Cayenne, French Guiana climate
Am Tropical monsoon
Cayenne has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is October with an average daily high near 91°F, while the coldest is January averaging around 74°F at night. Precipitation totals about 134 inches a year and is strongly seasonal — May alone averages 22.4 inches while October barely receives 2.17 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Cayenne climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 86 | 86 | 87 | 87 | 88 | 90 | 90 | 91 | 89 | 87 |
| Avg temp (°F) | 80 | 80 | 80 | 81 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 80 |
| Avg low (°F) | 74 | 74 | 75 | 75 | 74 | 73 | 72 | 72 | 72 | 72 | 73 | 74 |
| Precipitation (in) | 15.3 | 13.3 | 11.9 | 17.4 | 22.4 | 15.1 | 10.2 | 5.5 | 2.3 | 2.2 | 5.3 | 13.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 86 | 86 | 87 | 87 |
| Avg temp (°F) | 80 | 80 | 80 | 81 | 80 | 80 |
| Avg low (°F) | 74 | 74 | 75 | 75 | 74 | 73 |
| Precipitation (in) | 15.3 | 13.3 | 11.9 | 17.4 | 22.4 | 15.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 90 | 90 | 91 | 89 | 87 |
| Avg temp (°F) | 80 | 81 | 81 | 81 | 81 | 80 |
| Avg low (°F) | 72 | 72 | 72 | 72 | 73 | 74 |
| Precipitation (in) | 10.2 | 5.5 | 2.3 | 2.2 | 5.3 | 13.0 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 24 | 22 | 22 | 23 | 26 | 26 | 23 | 17 | 10 | 10 | 16 | 23 |
| Days with high ≥ 90°F (days) | 0.1 | 0.2 | 0.2 | 0.5 | 1 | 2 | 6 | 12 | 18 | 21 | 12 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 24 | 22 | 22 | 23 | 26 | 26 |
| Days with high ≥ 90°F (days) | 0.1 | 0.2 | 0.2 | 0.5 | 1 | 2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 23 | 17 | 10 | 10 | 16 | 23 |
| Days with high ≥ 90°F (days) | 6 | 12 | 18 | 21 | 12 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 78 | 73 | 75 | 78 | 69 | 57 | 46 | 37 | 44 | 57 | 69 |
| Relative humidity (%) | 85 | 84 | 83 | 86 | 89 | 89 | 87 | 86 | 83 | 80 | 82 | 85 |
| Wind speed (mph) | 5.0 | 5.3 | 5.2 | 4.9 | 4.5 | 3.9 | 3.6 | 3.8 | 4.0 | 4.1 | 4.2 | 4.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 78 | 73 | 75 | 78 | 69 |
| Relative humidity (%) | 85 | 84 | 83 | 86 | 89 | 89 |
| Wind speed (mph) | 5.0 | 5.3 | 5.2 | 4.9 | 4.5 | 3.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 46 | 37 | 44 | 57 | 69 |
| Relative humidity (%) | 87 | 86 | 83 | 80 | 82 | 85 |
| Wind speed (mph) | 3.6 | 3.8 | 4.0 | 4.1 | 4.2 | 4.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Rochambeau, a weather station, about 12 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.