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Monthly climate in Apatou, French Guiana

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Apatou features a tropical rainforest climate (Af). Temperatures typically range between 25 °C (78 °F) and 28 °C (82 °F) through the year, but rarely can drop to 19 °C (66 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 2297 mm (90.4 inches) and receives 260 rainy days on the 1 mm (0.04 inches) threshold annually. Apatou enjoys an average of 3452 hours of sunshine throughout the year, and daylight varies from 11 hours 49 minutes to 12 hours 23 minutes per day.

Monthly average temperatures in Apatou, French Guiana

The warmest months in Apatou are September, October and November, with daily mean temperatures ranging from 27 to 28 °C (80 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 25 to 26 °C (78 - 78 °F) throughout the day. On average each year, Apatou experiences 329 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Apatou. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum33°C
(92°F)		33°C
(92°F)		35°C
(96°F)		34°C
(93°F)		33°C
(91°F)		33°C
(91°F)		33°C
(92°F)		34°C
(94°F)		37°C
(99°F)		36°C
(96°F)		36°C
(97°F)		34°C
(94°F)
Mean maximum32°C
(89°F)		32°C
(90°F)		33°C
(91°F)		32°C
(90°F)		32°C
(91°F)		31°C
(89°F)		33°C
(91°F)		34°C
(93°F)		35°C
(95°F)		35°C
(96°F)		34°C
(93°F)		32°C
(91°F)
Average high30°C
(86°F)		30°C
(86°F)		30°C
(87°F)		30°C
(86°F)		30°C
(86°F)		30°C
(86°F)		31°C
(88°F)		32°C
(90°F)		33°C
(92°F)		33°C
(92°F)		32°C
(90°F)		30°C
(86°F)
Daily mean25°C
(78°F)		26°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		27°C
(80°F)		27°C
(82°F)		28°C
(82°F)		27°C
(80°F)		26°C
(78°F)
Average low23°C
(73°F)		23°C
(73°F)		23°C
(73°F)		23°C
(74°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)		23°C
(74°F)
Mean minimum21°C
(70°F)		21°C
(69°F)		21°C
(69°F)		21°C
(71°F)		22°C
(73°F)		22°C
(73°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(73°F)		22°C
(71°F)
Minimum19°C
(66°F)		20°C
(68°F)		20°C
(68°F)		21°C
(70°F)		22°C
(72°F)		22°C
(71°F)		22°C
(71°F)		22°C
(71°F)		21°C
(70°F)		22°C
(71°F)		22°C
(72°F)		20°C
(69°F)

Compare climate in Apatou with other places

Compare temperature, precipitation, sunshine, UV index in Apatou, French Guiana with other places around the world.

Monthly average precipitation in Apatou, French Guiana

Apatou usually has the most precipitation in April, May and June, with an average of 27 rainy days and 343 mm (13.5 inches) of precipitation per month. The driest months in Apatou are February, September and October. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Apatou. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)125 (4.9)102 (4.0)106 (4.2)257 (10.1)432 (17.0)340 (13.4)256 (10.1)132 (5.2)96 (3.8)63 (2.5)165 (6.5)223 (8.8)
Average precipitation days (≥ 1 mm)171617242929281914162328

Monthly sunshine hours in Apatou, French Guiana

The sunniest months in Apatou are August, September and October, when the sun shines an average of 10 hours 48 minutes a day. Least sunny months in Apatou: January, February and May receive an average of 8 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Apatou. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours239259309262248265304333326334289281
Mean daily daylight hours11h 50m11h 56m12h 4m12h 13m12h 20m12h 23m12h 22m12h 15m12h 7m11h 59m11h 52m11h 49m

Solar UV radiation in Apatou, French Guiana

Apatou experiences the highest level of ultraviolet (UV) radiation in February, March and April, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure. June, July and December are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 12. For more detailed information, check out our hourly Apatou UV Index data.

Average daily maximum UV levels by month for Apatou. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)131516161412121313131312