UV Index
UV Index
Today's UV index in Vientiane, Laos 
will be up to 12.3, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-21
UV index at 12.3 in Vientiane means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Vientiane can reach very high levels, especially from March to May, often peaking around 10 or 11. This means the sun’s rays are very strong during these months.
Vientiane has three main seasons: a hot season from March to May, a rainy season from May to October, and a cool season from November to February. The hottest months are April and May, while it rains most in July and August.
Compared to nearby countries like Thailand and Vietnam, Vientiane is usually hotter in the dry season but has similar heavy rains during the monsoon. It is a bit drier than some coastal parts of Vietnam.
See the UV index hour by hour for Vientiane, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.