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Monthly climate in Cayenne, French Guiana

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Cayenne features a tropical rainforest climate (Af).Temperatures typically range between 26 °C (79 °F) and 28 °C (82 °F) through the year, but rarely can drop to 23 °C (74 °F) or can rise to as high as 32 °C (90 °F).The average annual precipitation amounts to about 3038 mm (119.6 inches) and receives 286 rainy days on the 1 mm (0.04 inches) threshold annually.Cayenne enjoys an average of 3566 hours of sunshine throughout the year, and daylight varies from 11 hours 50 minutes to 12 hours 23 minutes per day.

Monthly average temperatures in Cayenne, French Guiana §

The warmest months in Cayenne are August, September and October, with daily mean temperatures ranging from 27 to 28 °C (81 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 26 to 26 °C (79 - 79 °F) throughout the day. On average each year, Cayenne 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 Cayenne, French Guiana.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 29°C
(84°F)		 28°C
(83°F)		 30°C
(86°F)		 29°C
(85°F)		 30°C
(86°F)		 30°C
(86°F)		 30°C
(87°F)		 32°C
(89°F)		 32°C
(90°F)		 32°C
(90°F)		 31°C
(88°F)		 30°C
(86°F)
Mean maximum 28°C
(84°F)		 28°C
(83°F)		 29°C
(84°F)		 29°C
(84°F)		 29°C
(85°F)		 29°C
(85°F)		 30°C
(86°F)		 31°C
(88°F)		 32°C
(89°F)		 31°C
(89°F)		 30°C
(87°F)		 29°C
(85°F)
Average high 27°C
(81°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(82°F)		 28°C
(82°F)		 28°C
(83°F)		 29°C
(84°F)		 30°C
(86°F)		 31°C
(87°F)		 30°C
(87°F)		 29°C
(85°F)		 28°C
(82°F)
Daily mean 26°C
(79°F)		 26°C
(79°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)		 26°C
(80°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(82°F)		 27°C
(81°F)		 26°C
(79°F)
Average low 25°C
(77°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(78°F)		 26°C
(78°F)		 26°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)
Mean minimum 24°C
(75°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 24°C
(75°F)		 24°C
(76°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(76°F)		 24°C
(76°F)
Minimum 23°C
(74°F)		 24°C
(75°F)		 24°C
(75°F)		 24°C
(75°F)		 24°C
(76°F)		 23°C
(75°F)		 24°C
(75°F)		 24°C
(75°F)		 24°C
(76°F)		 25°C
(77°F)		 24°C
(76°F)		 24°C
(75°F)

Compare climate in Cayenne with other places

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

Monthly average precipitation in Cayenne, French Guiana §

Cayenne usually has the most precipitation in April, May and June, with an average of 28 rainy days and 467 mm (18.4 inches) of precipitation per month.The driest months in Cayenne are August, September and October. On average, 69 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Cayenne, French Guiana.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 225 (8.9) 189 (7.5) 196 (7.7) 390 (15.4) 576 (22.7) 433 (17.1) 269 (10.6) 92 (3.6) 56 (2.2) 59 (2.3) 204 (8.0) 349 (13.7)
Average precipitation days (≥ 1 mm) 23 24 25 27 30 29 29 18 12 16 24 29

Monthly sunshine hours in Cayenne, French Guiana §

The sunniest months in Cayenne are August, September and October, when the sun shines an average of 11 hours 8 minutes a day.Least sunny months in Cayenne: January, February and May receive an average of 8 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Cayenne, French Guiana.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 244 255 311 274 259 280 330 346 337 341 300 282
Mean daily daylight hours 11h 51m 11h 57m 12h 4m 12h 12m 12h 19m 12h 23m 12h 21m 12h 15m 12h 7m 11h 59m 11h 52m 11h 50m

Solar UV radiation in Cayenne, French Guiana §

Cayenne experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 14 - 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 13. For more detailed information, check out our hourly Cayenne UV Index data.

Average daily maximum UV levels by month for Cayenne, French Guiana.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 13 14 16 16 14 13 12 13 13 13 13 12