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Monthly climate in Viengthong, Laos

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Viengthong features a humid subtropical climate (Cwa). Temperatures typically range between 15 °C (59 °F) and 24 °C (75 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 1516 mm (59.7 inches) and receives 181 rainy days on the 1 mm (0.04 inches) threshold annually. Viengthong enjoys an average of 3250 hours of sunshine throughout the year, and daylight varies from 10 hours 54 minutes to 13 hours 19 minutes per day.

Monthly average temperatures in Viengthong, Laos

The warmest months in Viengthong are June, July and August, with daily mean temperatures ranging from 23 to 24 °C (73 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 15 to 17 °C (59 - 62 °F) throughout the day. On average each year, Viengthong experiences 202 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 Viengthong. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(81°F)		31°C
(89°F)		33°C
(92°F)		34°C
(94°F)		35°C
(95°F)		34°C
(94°F)		32°C
(90°F)		31°C
(89°F)		31°C
(88°F)		30°C
(87°F)		29°C
(85°F)		27°C
(81°F)
Mean maximum26°C
(80°F)		28°C
(83°F)		31°C
(88°F)		32°C
(90°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		30°C
(87°F)		30°C
(87°F)		29°C
(85°F)		28°C
(82°F)		26°C
(79°F)
Average high21°C
(71°F)		23°C
(75°F)		26°C
(80°F)		27°C
(81°F)		28°C
(83°F)		28°C
(83°F)		27°C
(82°F)		27°C
(81°F)		27°C
(81°F)		25°C
(77°F)		24°C
(75°F)		21°C
(70°F)
Daily mean15°C
(60°F)		17°C
(62°F)		20°C
(68°F)		21°C
(70°F)		23°C
(73°F)		24°C
(75°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		21°C
(69°F)		18°C
(65°F)		15°C
(59°F)
Average low11°C
(53°F)		12°C
(53°F)		15°C
(59°F)		17°C
(63°F)		19°C
(67°F)		21°C
(70°F)		21°C
(70°F)		20°C
(69°F)		20°C
(68°F)		17°C
(64°F)		15°C
(58°F)		11°C
(51°F)
Mean minimum6°C
(44°F)		7°C
(45°F)		12°C
(53°F)		12°C
(54°F)		16°C
(61°F)		20°C
(68°F)		20°C
(68°F)		19°C
(67°F)		17°C
(63°F)		13°C
(56°F)		9°C
(49°F)		4°C
(40°F)
Minimum3°C
(38°F)		6°C
(42°F)		9°C
(49°F)		7°C
(45°F)		13°C
(56°F)		19°C
(66°F)		19°C
(67°F)		19°C
(67°F)		13°C
(56°F)		11°C
(51°F)		9°C
(48°F)		-0°C
(32°F)

Compare climate in Viengthong with other places

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

Monthly average precipitation in Viengthong, Laos

Viengthong usually has the most precipitation in June, July and August, with an average of 26 rainy days and 268 mm (10.5 inches) of precipitation per month. The driest months in Viengthong are February, November and December. On average, 21 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Viengthong. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)26 (1.0)25 (1.0)60 (2.3)148 (5.8)165 (6.5)196 (7.7)260 (10.2)347 (13.7)152 (6.0)101 (4.0)19 (0.7)18 (0.7)
Average precipitation days (≥ 1 mm)53101622252727221653

Monthly sunshine hours in Viengthong, Laos

The sunniest months in Viengthong are March, May and September, when the sun shines an average of 9 hours 42 minutes a day. Least sunny months in Viengthong: January, August and November receive an average of 7 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Viengthong. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours211273298275314276271245280264263276
Mean daily daylight hours11h 2m11h 27m12h 1m12h 36m13h 5m13h 19m13h 12m12h 46m12h 13m11h 39m11h 9m10h 54m

Solar UV radiation in Viengthong, Laos

Viengthong experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 15 - 15, 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 10. For more detailed information, check out our hourly Viengthong UV Index data.

Average daily maximum UV levels by month for Viengthong. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)9111313151415151413108