Kourou climate — normals and trends
Kourou (French Guiana) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 25.8 °C and it receives 2,578 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is September (26.6 °C on average) and the coldest is January (25.2 °C). Rainfall peaks in May.
Kourou averages 0 frost days, 16 hot days (≥ 30 °C) and 292 rainy days per year.
Kourou has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.7 °C (on 21 September 2023) and the coldest 22.0 °C (on 21 March 1952).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
KourouGuyane
- coords
- 5.16°, -52.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.8°C
Average daily high
27.9°C
Average daily low
24.3°C
Annual rainfall
2,578mm
Sunshine / day
10.2h
Mean relative humidity
85%
Average peak wind
18.9km/h
Seasonal range
1.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
16 d/yr
Rainy days (≥ 1 mm)
292 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.3 °C
Average feels-like low
27.6 °C
Average peak gust
35.6 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
18.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.72 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.7 °C
21 September 2023
Coldest day
22.0 °C
21 March 1952
Wettest day
210 mm
29 May 1967
Windiest day
30.8 km/h
9 January 1987
Strongest gust
55.8 km/h
9 April 1996
Hottest feels-like
40.0 °C
4 September 2024
Coldest feels-like
23.1 °C
9 March 1975
Sunniest day
12.2 h
6 June 2016
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 27.9 °C | +0.9 °C | 328 mm | +60 mm |
| Feb | 27.8 °C | +0.8 °C | 282 mm | +68 mm |
| Mar | 28.0 °C | +0.7 °C | 258 mm | +55 mm |
| Apr | 28.7 °C | +1.1 °C | 249 mm | -6 mm |
| May | 28.2 °C | +0.7 °C | 684 mm | +271 mm |
| Jun | 28.4 °C | +0.9 °C | 469 mm | +100 mm |
| Jul | 29.1 °C | +1.1 °C | 219 mm | -8 mm |
| Aug | 29.4 °C | +0.6 °C | 133 mm | +23 mm |
| Sep | 30.2 °C | +1.1 °C | 55 mm | -2 mm |
| Oct | 29.8 °C | +0.6 °C | 74 mm | +7 mm |
| Nov | 29.2 °C | +0.7 °C | 103 mm | -38 mm |
| Dec | 28.1 °C | +0.6 °C | 251 mm | -4 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Kourou?
Kourou has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 2,578 mm of precipitation per year.
What is the hottest day ever recorded in Kourou?
The hottest day measured in Kourou between 1940 and 2025 was 21 September 2023, reaching 31.7 °C.
What is the coldest day in Kourou?
The coldest day measured in Kourou between 1940 and 2025 was 21 March 1952, at 22.0 °C.
Does it snow in Kourou?
Almost never: Kourou sees virtually no snow, with about 0 frost days per year.
Has the climate of Kourou warmed?
Yes: Kourou warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kourou?
The wettest day measured in Kourou between 1940 and 2025 was 29 May 1967, with 210 mm of rain in 24 hours.
What was the windiest day in Kourou?
The windiest day measured in Kourou between 1940 and 2025 was 9 January 1987, with winds reaching 30.8 km/h.
What is the warmest month in Kourou?
The warmest month in Kourou is September (26.6 °C on average); the coldest is January (25.2 °C).
How much does it rain in Kourou?
Kourou receives on average 2,578 mm of precipitation per year, spread over about 292 rainy days.
Is it sunny in Kourou?
Kourou gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
Are there tropical nights in Kourou?
Yes: Kourou has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kourou?
In Kourou, between 1940 and 2025, the highest apparent temperature reached 40.0 °C on 4 September 2024, and the lowest was 23.1 °C on 9 March 1975.
Compare Kourou with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kourou