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 then reach 29 °C84 °F to 30 °C85 °F. Precipitation is 54 mm2.1 in to 58 mm2.3 in 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 ideal. That means 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
The nearest larger place is Paramaribo, about 330 km to the west. Compared with it, Cayenne is on average 0.4 °C0.7 °F cooler. It receives 65% more precipitation (2,873 mm113 in vs 1,744 mm69 in). The difference is largest in September (1 °C1.8 °F cooler).
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Paramaribo (Suriname, Am), Macapá (Brazil, Am) and Kotamobagu (Indonesia, Af).
Nearby places
- Climate in Paramaribo 330 km · 27 °C80 °F · 1,744 mm69 in
- Climate in Macapá 563 km · 27 °C80 °F · 2,068 mm81 in
- Climate in Santana 568 km · 27 °C80 °F · 2,068 mm81 in
- Climate in Georgetown 676 km · 27 °C81 °F · 2,302 mm91 in
- Climate in Breves 764 km · 27 °C80 °F · 2,418 mm95 in
- Climate in Ananindeua 828 km · 27 °C80 °F · 2,622 mm103 in
- Climate in Belém 829 km · 27 °C81 °F · 2,569 mm101 in
- Climate 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. Its average high is 30 °C (85 °F) and its average low is 25 °C (77 °F).
What is the coldest month in Cayenne?
February is the coldest month. Its average high is 27 °C (81 °F) and its average low is 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. The gaps are largest 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.