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From Town Tools. For the current version, visit https://www.towntools.org/pai-mae-hong-son-province-th/when-to-come
Pai's year has three faces: a clear, cool dry season from November to January, a hot burning season from February to April when smoke fills the valley, and a green monsoon from May to October, heaviest in July and August. Which months suit you depends mostly on how you weigh smoke against rain. This page shows the pattern of past years, month by month.
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The current month is selected to start.
January
The classic month to be in Pai: dry, cool and clear, before the burning season. Also the busiest — book beds ahead.
Weather
Dry and cool — clear days, cold nights in the valley. Usually the most comfortable month of the year.
Smoke & haze
clear
Prices
high
Crowds
busy
These are the patterns of past years, not a forecast. Burning season and the monsoon both shift by a few weeks from year to year — for what the air and the rain are doing right now, use the live pages linked below.
Rain & the Pai RiverWhere the monsoon stands — the last 30 days against the long-term average, and the week ahead.
The year at a glance
January
The classic month to be in Pai: dry, cool and clear, before the burning season. Also the busiest — book beds ahead.
February
A gamble: early February can still be lovely, but burning season usually arrives during the month and the valley starts to fill with haze.
March
The heart of burning season. In recent years PM2.5 in Pai district has run several times above the Thai daily standard for weeks. Most people who can choose their dates avoid March.
April
Hot and often still smoky — in 2026 the haze ran well into April. Songkran (mid-April) brings a burst of visitors despite it.
May
A transition month — you might get late smoke or early rains. When the first storms come, the air clears and the valley turns green.
June
Green, quiet and cheap. Rain comes mostly in bursts. The 762-curve road needs more care in the wet.
(3 months ago)
July
Very green and very wet. Fine if you don't mind rain; watch the river and the road in heavy spells.
August
The wettest stretch of the year alongside July. Riverside places should know their higher ground — Pai's floods come fast, from heavy overnight rain.
September
Late monsoon is when the big floods have come — September 2024 put around 10,000 people under water after one night of rain. A quiet, green month, but stay flood-aware near the river.
October
An underrated month: the monsoon fades, everything is green, and the cool season is around the corner.
November
The start of the best window. Clear, dry and comfortable, before the December–January peak crowds fully arrive.
December
Peak season: the weather at its best and the town at its fullest. Book ahead around Christmas and New Year.
October
The rains taper off through the month; the valley is at its greenest and the air is washed clean.