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Monthly climate in Vientiane, Laos

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Vientiane features a tropical savanna climate (Aw). Temperatures typically range between 23 °C (74 °F) and 29 °C (85 °F) through the year, but rarely can drop to 9 °C (48 °F) or can rise to as high as 42 °C (107 °F). The average annual precipitation amounts to about 1790 mm (70.5 inches) and receives 160 rainy days on the 1 mm (0.04 inches) threshold annually. Vientiane enjoys an average of 3457 hours of sunshine throughout the year, and daylight varies from 11 hours 3 minutes to 13 hours 10 minutes per day.

Monthly average temperatures in Vientiane, Laos

The warmest months in Vientiane are April, May and June, with daily mean temperatures ranging from 29 to 29 °C (85 - 85 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 23 to 25 °C (74 - 76 °F) throughout the day. On average each year, Vientiane experiences 324 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 Vientiane. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum35°C
(95°F)		38°C
(100°F)		40°C
(104°F)		42°C
(107°F)		41°C
(107°F)		39°C
(102°F)		37°C
(99°F)		37°C
(98°F)		37°C
(98°F)		36°C
(98°F)		36°C
(98°F)		35°C
(95°F)
Mean maximum34°C
(93°F)		37°C
(99°F)		39°C
(102°F)		40°C
(104°F)		38°C
(101°F)		36°C
(97°F)		36°C
(97°F)		36°C
(97°F)		36°C
(97°F)		35°C
(95°F)		35°C
(95°F)		33°C
(91°F)
Average high30°C
(86°F)		32°C
(89°F)		35°C
(94°F)		35°C
(95°F)		34°C
(94°F)		33°C
(92°F)		32°C
(91°F)		32°C
(90°F)		33°C
(91°F)		32°C
(90°F)		32°C
(89°F)		30°C
(85°F)
Daily mean24°C
(75°F)		25°C
(76°F)		28°C
(82°F)		29°C
(85°F)		29°C
(85°F)		29°C
(85°F)		29°C
(84°F)		28°C
(83°F)		28°C
(83°F)		28°C
(82°F)		26°C
(79°F)		23°C
(74°F)
Average low18°C
(65°F)		19°C
(66°F)		22°C
(73°F)		24°C
(76°F)		26°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		25°C
(78°F)		24°C
(76°F)		22°C
(71°F)		18°C
(64°F)
Mean minimum14°C
(57°F)		15°C
(59°F)		19°C
(66°F)		21°C
(70°F)		23°C
(74°F)		24°C
(76°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)		21°C
(71°F)		18°C
(64°F)		12°C
(54°F)
Minimum10°C
(51°F)		13°C
(55°F)		17°C
(63°F)		17°C
(63°F)		22°C
(71°F)		24°C
(75°F)		25°C
(76°F)		24°C
(75°F)		23°C
(73°F)		20°C
(68°F)		17°C
(63°F)		9°C
(48°F)

Compare climate in Vientiane with other places

Compare temperature, precipitation, sunshine, UV index in Vientiane, Laos with other places around the world.

Monthly average precipitation in Vientiane, Laos

Vientiane usually has the most precipitation in June, July and August, with an average of 25 rainy days and 347 mm (13.7 inches) of precipitation per month. The driest months in Vientiane are January, November and December. On average, 8 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Vientiane. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)6 (0.2)17 (0.7)41 (1.6)70 (2.8)204 (8.0)309 (12.2)331 (13.0)402 (15.8)265 (10.4)129 (5.1)10 (0.4)7 (0.3)
Average precipitation days (≥ 1 mm)1161121252626241531

Monthly sunshine hours in Vientiane, Laos

The sunniest months in Vientiane are March, April and December, when the sun shines an average of 10 hours 12 minutes a day. Least sunny months in Vientiane: January, July and August receive an average of 8 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Vientiane. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours252292318309308271269249274295305311
Mean daily daylight hours11h 10m11h 32m12h 2m12h 32m12h 57m13h 10m13h 4m12h 41m12h 12m11h 42m11h 16m11h 3m

Solar UV radiation in Vientiane, Laos

Vientiane experiences the highest level of ultraviolet (UV) radiation in April, August and September, when the maximum UV index can reach values of 14 - 14, which corresponds to the Extreme category of sun exposure. January, November and December are in the 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 Vientiane UV Index data.

Average daily maximum UV levels by month for Vientiane. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)911131414131414141298