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UV Index in Laos

Live UV forecast for 18 cities

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UV climate of Laos: overview

Laos stretches from 15.1202° to 21.1921° latitude (Northern hemisphere), so UV conditions differ a lot from region to region. The clear-sky UV index reaches ≈ 9.7 in Ban Laongam (peak in May), while in Muang Xay the yearly maximum is only ≈ 9.2.

UV index by month by climate zone

ZoneCitiesJFMAMJJASONDPeak
Tropical18 7 7.8 8.7 9.3 9.4 9.4 9.4 9.4 9.1 8.4 7.5 6.9 9.4

Calculated clear-sky noon peaks at the average latitude of each zone. Real values vary with clouds, altitude and ozone.

Sunniest cities in Laos (highest UV)

Ban Laongam · 9.7 in May Pakse · 9.7 in May Sekong · 9.7 in May Ban Kengkok · 9.6 in May Ban Xeno · 9.6 in May

Cities with the mildest sun

Muang Xay · max 9.2 Muang Sing · max 9.2 Xam Nua · max 9.3 Muang Phonsavan · max 9.3 Luang Prabang · max 9.3

When do you need SPF in Laos?

Using Vientiane as a reference: the UV index reaches 6+ in January, February, March, April, May, June, July, August, September, October, November and December. In the sunniest zones (see table) SPF 30–50+ is needed almost year-round; in the mildest — only in late spring and summer.

FAQ: UV index in Laos

What is the highest UV index in Laos?

The calculated clear-sky maximum is ≈ 9.7 — in Ban Laongam around May. Values above this occur only near the equator and in high mountains.

Which city in Laos is the sunniest?

Ban Laongam (peak ≈ 9.7), followed by Pakse and Sekong. The mildest sun is in Muang Xay (max ≈ 9.2).

When is SPF needed in Laos?

In Vientiane and similar latitudes the UV reaches 6+ in January, February, March, April, May, June, July, August, September, October, November and December: use SPF 30–50+ on sunny days. Protection is advised from UV 3.

Is UV 11+ possible in Laos?

No — the local maximum is ≈ 9.7. UV 11+ occurs only near the equator, in deserts and high mountains.