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Monthly climate in Cilaos, Réunion

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Cilaos features a oceanic climate (Cfb). Temperatures typically range between 17 °C (63 °F) and 23 °C (73 °F) through the year, but rarely can drop to 11 °C (53 °F) or can rise to as high as 29 °C (85 °F). The average annual precipitation amounts to about 1588 mm (62.5 inches) and receives 245 rainy days on the 1 mm (0.04 inches) threshold annually. Cilaos enjoys an average of 4035 hours of sunshine throughout the year, and daylight varies from 10 hours 50 minutes to 13 hours 23 minutes per day.

Monthly average temperatures in Cilaos, Réunion

The warmest months in Cilaos are January, February and March, with daily mean temperatures ranging from 23 to 23 °C (73 - 73 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 17 to 18 °C (63 - 64 °F) throughout the day. On average each year, Cilaos experiences 89 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 Cilaos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum29°C
(85°F)		29°C
(85°F)		28°C
(82°F)		27°C
(81°F)		25°C
(78°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		24°C
(76°F)		26°C
(80°F)		27°C
(81°F)		28°C
(83°F)
Mean maximum28°C
(82°F)		28°C
(82°F)		27°C
(81°F)		26°C
(79°F)		25°C
(76°F)		23°C
(73°F)		22°C
(72°F)		22°C
(72°F)		23°C
(74°F)		25°C
(77°F)		26°C
(79°F)		27°C
(81°F)
Average high26°C
(78°F)		25°C
(78°F)		25°C
(78°F)		24°C
(76°F)		22°C
(72°F)		21°C
(69°F)		20°C
(68°F)		20°C
(69°F)		21°C
(70°F)		22°C
(73°F)		24°C
(75°F)		25°C
(78°F)
Daily mean23°C
(73°F)		23°C
(73°F)		23°C
(73°F)		22°C
(71°F)		20°C
(67°F)		18°C
(65°F)		17°C
(63°F)		17°C
(63°F)		18°C
(64°F)		19°C
(67°F)		20°C
(69°F)		22°C
(72°F)
Average low21°C
(70°F)		21°C
(70°F)		21°C
(70°F)		20°C
(68°F)		18°C
(64°F)		16°C
(61°F)		15°C
(59°F)		15°C
(59°F)		15°C
(60°F)		17°C
(63°F)		18°C
(65°F)		20°C
(68°F)
Mean minimum19°C
(66°F)		19°C
(67°F)		19°C
(66°F)		18°C
(64°F)		15°C
(60°F)		14°C
(58°F)		13°C
(56°F)		12°C
(55°F)		13°C
(56°F)		14°C
(58°F)		16°C
(60°F)		18°C
(64°F)
Minimum17°C
(63°F)		19°C
(66°F)		18°C
(64°F)		16°C
(61°F)		14°C
(58°F)		13°C
(56°F)		12°C
(54°F)		11°C
(53°F)		12°C
(54°F)		14°C
(57°F)		13°C
(56°F)		17°C
(62°F)

Compare climate in Cilaos with other places

Compare temperature, precipitation, sunshine, UV index in Cilaos, Réunion with other places around the world.

Monthly average precipitation in Cilaos, Réunion

Cilaos usually has the most precipitation in January, February and March, with an average of 24 rainy days and 234 mm (9.2 inches) of precipitation per month. The driest months in Cilaos are July, August and September. On average, 63 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Cilaos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)230 (9.1)229 (9.0)242 (9.5)179 (7.0)85 (3.3)75 (2.9)69 (2.7)64 (2.5)58 (2.3)88 (3.5)128 (5.0)142 (5.6)
Average precipitation days (≥ 1 mm)212427242020191414182024

Monthly sunshine hours in Cilaos, Réunion

The sunniest months in Cilaos are October, November and December, when the sun shines an average of 12 hours 16 minutes a day. Least sunny months in Cilaos: January, June and July receive an average of 9 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Cilaos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours304336352315318301313329334365371393
Mean daily daylight hours13h 14m12h 46m12h 10m11h 34m11h 5m10h 50m10h 58m11h 23m11h 58m12h 34m13h 6m13h 23m

Solar UV radiation in Cilaos, Réunion

Cilaos experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 17, which corresponds to the Extreme category of sun exposure. May, June and July are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly Cilaos UV Index data.

Average daily maximum UV levels by month for Cilaos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)161714129781011131415