Cayenne climate
Cayenne (French Guiana) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 26 °C80 °F, and about 2,873 mm113 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Cayenne climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2781 | 2476 | 2678 | 30012 |
| Feb | 2781 | 2476 | 2678 | 26410 |
| Mar | 2882 | 2476 | 2679 | 2519.9 |
| Apr | 2882 | 2576 | 2679 | 36915 |
| May | 2882 | 2577 | 2679 | 50420 |
| Jun | 2882 | 2576 | 2679 | 33413 |
| Jul | 2882 | 2476 | 2679 | 2178.6 |
| Aug | 2883 | 2576 | 2680 | 1094.3 |
| Sep | 2984 | 2576 | 2780 | 542.1 |
| Oct | 3085 | 2577 | 2781 | 582.3 |
| Nov | 2985 | 2577 | 2781 | 1104.3 |
| Dec | 2882 | 2576 | 2679 | 30312 |
| Year | 3085 | 2476 | 2680 | 2,873113 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 85% | 73% | 4.0 | 11:52 |
| Feb | 84% | 78% | 4.1 | 11:58 |
| Mar | 83% | 71% | 4.5 | 12:05 |
| Apr | 86% | 76% | 4.3 | 12:13 |
| May | 89% | 80% | 4.0 | 12:21 |
| Jun | 89% | 70% | 4.6 | 12:24 |
| Jul | 87% | 57% | 5.1 | 12:23 |
| Aug | 86% | 44% | 5.8 | 12:17 |
| Sep | 83% | 35% | 6.2 | 12:08 |
| Oct | 80% | 43% | 5.9 | 12:00 |
| Nov | 82% | 54% | 5.1 | 11:53 |
| Dec | 85% | 70% | 4.2 | 11:50 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Cayenne is like
The warmest month is October, with an average high of 30 °C85 °F and a low of 25 °C77 °F. The coldest is February, when highs average 27 °C81 °F and lows 24 °C76 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 1.5 °C2.7 °F.
It is very wet, receiving about 2,873 mm113 in of precipitation per year. The wettest three-month stretch is April–June, which brings 42% of the annual total. The wettest month is May (504 mm20 in), the driest is September (54 mm2.1 in).
Relative humidity ranges from 80% in October to 89% in May. The clearest skies (lowest average cloud amount, 35%) are typical of September. Average wind speed near the ground ranges from 6 km/h (4 mph) in July to 8 km/h (5 mph) in February.
Best time to visit Cayenne
Based on these averages, the most comfortable months for sightseeing and outdoor activities are September and October: average highs of 29 °C84 °F to 30 °C85 °F with 54 mm2.1 in to 58 mm2.3 in of precipitation per month.
The most challenging month is May, which is very wet (504 mm20 in) and humid (89% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Cayenne
- Wetter months (December–June) — highs 2781 to 28 °C82 °F, lows 2476 to 25 °C77 °F, about 332 mm13 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (July–November) — highs 2882 to 30 °C85 °F, lows 2476 to 25 °C77 °F, about 110 mm4.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Cayenne compares
Compared with Paramaribo, about 330 km to the west, Cayenne is on average 0.4 °C0.7 °F cooler and receives 65% more precipitation (2,873 mm113 in vs 1,744 mm69 in). The difference is largest in September (1 °C1.8 °F cooler).
Places in other countries with the most similar temperature and rainfall pattern: Paramaribo (Suriname, Am), Macapá (Brazil, Am) and Kotamobagu (Indonesia, Af).
Nearby places
- Paramaribo 330 km · 27 °C80 °F · 1,744 mm69 in
- Macapá 563 km · 27 °C80 °F · 2,068 mm81 in
- Santana 568 km · 27 °C80 °F · 2,068 mm81 in
- Georgetown 676 km · 27 °C81 °F · 2,302 mm91 in
- Breves 764 km · 27 °C80 °F · 2,418 mm95 in
- Ananindeua 828 km · 27 °C80 °F · 2,622 mm103 in
- Belém 829 km · 27 °C81 °F · 2,569 mm101 in
- Castanhal 849 km · 26 °C80 °F · 2,622 mm103 in
Frequently asked questions
What is the warmest month in Cayenne?
October is the warmest month in Cayenne, with an average high of 30 °C (85 °F) and an average low of 25 °C (77 °F).
What is the coldest month in Cayenne?
February is the coldest month, with an average high of 27 °C (81 °F) and an average low of 24 °C (76 °F).
When does it rain the most in Cayenne?
May is the wettest month with about 504 mm (19.8 in) of precipitation; September is the driest with about 54 mm (2.1 in).
What is the best time to visit Cayenne?
Judging by long-term averages, the most comfortable months are September and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.