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Monthly climate in Siem Reap, Cambodia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Siem Reap features a tropical savanna climate (Aw). Temperatures typically range between 26 °C (80 °F) and 30 °C (87 °F) through the year, but rarely can drop to 15 °C (59 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 1279 mm (50.4 inches) and receives 176 rainy days on the 1 mm (0.04 inches) threshold annually. Siem Reap enjoys an average of 3563 hours of sunshine throughout the year, and daylight varies from 11 hours 20 minutes to 12 hours 53 minutes per day.

Monthly average temperatures in Siem Reap, Cambodia

The warmest months in Siem Reap are March, April and May, with daily mean temperatures ranging from 30 to 30 °C (86 - 87 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 26 to 27 °C (80 - 82 °F) throughout the day. On average each year, Siem Reap experiences 328 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 Siem Reap. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum35°C
(95°F)		36°C
(97°F)		37°C
(99°F)		39°C
(102°F)		39°C
(103°F)		38°C
(100°F)		38°C
(101°F)		37°C
(99°F)		35°C
(96°F)		34°C
(93°F)		34°C
(94°F)		34°C
(94°F)
Mean maximum34°C
(93°F)		35°C
(96°F)		36°C
(98°F)		38°C
(100°F)		37°C
(98°F)		35°C
(96°F)		36°C
(97°F)		36°C
(97°F)		34°C
(94°F)		33°C
(92°F)		33°C
(92°F)		33°C
(92°F)
Average high31°C
(89°F)		33°C
(91°F)		34°C
(94°F)		34°C
(94°F)		34°C
(93°F)		33°C
(92°F)		33°C
(91°F)		33°C
(91°F)		32°C
(90°F)		31°C
(89°F)		31°C
(88°F)		30°C
(87°F)
Daily mean27°C
(81°F)		28°C
(82°F)		30°C
(86°F)		30°C
(87°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		29°C
(85°F)		28°C
(84°F)		28°C
(83°F)		27°C
(82°F)		26°C
(80°F)
Average low23°C
(74°F)		24°C
(75°F)		26°C
(80°F)		27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		27°C
(80°F)		27°C
(80°F)		26°C
(80°F)		26°C
(78°F)		25°C
(76°F)		23°C
(73°F)
Mean minimum19°C
(66°F)		20°C
(69°F)		24°C
(76°F)		23°C
(74°F)		25°C
(78°F)		26°C
(80°F)		25°C
(78°F)		25°C
(78°F)		25°C
(77°F)		24°C
(75°F)		22°C
(71°F)		19°C
(66°F)
Minimum15°C
(59°F)		17°C
(63°F)		22°C
(72°F)		20°C
(68°F)		22°C
(72°F)		26°C
(79°F)		25°C
(77°F)		25°C
(77°F)		24°C
(76°F)		22°C
(72°F)		21°C
(71°F)		16°C
(61°F)

Compare climate in Siem Reap with other places

Compare temperature, precipitation, sunshine, UV index in Siem Reap, Cambodia with other places around the world.

Monthly average precipitation in Siem Reap, Cambodia

Siem Reap usually has the most precipitation in August, September and October, with an average of 23 rainy days and 210 mm (8.3 inches) of precipitation per month. The driest months in Siem Reap are January, February and December. On average, 14 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Siem Reap. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)11 (0.4)9 (0.3)40 (1.6)86 (3.4)141 (5.6)117 (4.6)145 (5.7)152 (6.0)240 (9.4)238 (9.4)78 (3.1)23 (0.9)
Average precipitation days (≥ 1 mm)22614202123232522135

Monthly sunshine hours in Siem Reap, Cambodia

The sunniest months in Siem Reap are March, May and December, when the sun shines an average of 10 hours 17 minutes a day. Least sunny months in Siem Reap: January, September and October receive an average of 8 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Siem Reap. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours260299326309316303299286271276298314
Mean daily daylight hours11h 25m11h 41m12h 2m12h 25m12h 43m12h 53m12h 48m12h 32m12h 10m11h 48m11h 29m11h 20m

Solar UV radiation in Siem Reap, Cambodia

Siem Reap experiences the highest level of ultraviolet (UV) radiation in March, April and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High / Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. For more detailed information, check out our hourly Siem Reap UV Index data.

Average daily maximum UV levels by month for Siem Reap. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)101315141413141414121110