Pai in Fall
In fall (September, October and November), Pai sees average daytime highs around 28°C and overnight lows near 19°C, with 401 mm of rain over about 50 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 25% of the time across fall, and the air most often feels muggy.
Fall is Pai's 2nd-best season to visit on our travel score. For the whole year in context, see Pai's year-round climate.
- Avg daytime high
- 28°C
- 3rd-warmest season
- Avg overnight low
- 19°C
- Rainfall
- 401 mm
- 50 wet days
- Avg wind
- 4 km/h
- Travel score
- 5.2
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Pai in Fall
Across fall, daytime highs hold fairly steady around 28°C.
A typical fall day in Pai reaches about 28°C and drops to 19°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Pai
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
fall sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Pai weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 12° | 16 | 2.4 | 11 | 8.2 |
| Feb | 30° / 13° | 7 | 1.4 | 11.3 | 6.6 |
| Mar | 32° / 16° | 21 | 3.3 | 11.9 | 4.8 |
| Apr | 33° / 20° | 60 | 7.7 | 12.4 | 3.7 |
| May | 31° / 21° | 193 | 20.7 | 12.9 | 3.3 |
| Jun | 29° / 22° | 221 | 25.4 | 13.1 | 3.1 |
| Jul | 29° / 22° | 287 | 27.7 | 13.1 | 3.2 |
| Aug | 28° / 21° | 321 | 29 | 12.7 | 3.1 |
| Sep | 29° / 21° | 248 | 25.6 | 12.1 | 3.4 |
| Oct | 28° / 20° | 116 | 17.6 | 11.6 | 4.9 |
| Nov | 27° / 17° | 37 | 6.6 | 11.1 | 7.2 |
| Dec | 26° / 14° | 16 | 3.2 | 10.9 | 8.2 |
Cloud cover in Fall
The sky is clear or mostly clear about 25% of the time across fall.
Chance of precipitation in Fall
Pai gets around 401 mm of rain over 50 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 4 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early September to 10 h 54 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.3 kWh/m².
Hazard calendar for Pai
In fall, Pai overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Pai's monsoon runs May–September, when most of the year's rain falls.
Is fall a good time to visit Pai?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Pai for sightseeing.
What to pack for Pai in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Pai sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. About 50 days see rain.
UV index in Pai in Fall
Clear-sky midday UV across fall averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Pai peaks around August 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 7 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 10 | 10 | 10 | 12 | 12 | 13 | 14 | 12 | 11 | 9 | 7 |
| Level | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Very high |
| Mar | 10 | Very high |
| Apr | 10 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 7 | Very high |
Air quality in Pai in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Pai is worst in March — around 90 µg/m³ PM2.5 (unhealthy), about 9.6× the cleanest month (October, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 35 | 90 | 57 | 20 | 11 | 10 | 10 | 10 | 9 | 9 | 11 |
| Level | Moderate | Moderate | Unhealthy | Unhealthy | Moderate | Good | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 35 | Moderate |
| Mar | 90 | Unhealthy |
| Apr | 57 | Unhealthy |
| May | 20 | Moderate |
| Jun | 11 | Good |
| Jul | 10 | Good |
| Aug | 10 | Good |
| Sep | 10 | Good |
| Oct | 9 | Good |
| Nov | 9 | Good |
| Dec | 11 | Good |
Where is Pai?
Pai sits at 19.4°N, 98.4°E, 0 m above sea level, in Thailand. The nearest listed city is Chiang Mai, 86 km away.
Topography around Pai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Pai.
Within 3 km, the terrain around Pai has significant variations in elevation — a maximum elevation change of 444 m around an average of 563 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,543 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,997 m.
The land around Pai is covered by trees (48%), grassland (23%) and cropland (21%) within 3 km, trees (86%) within 16 km, and trees (91%) within 80 km.
Thailand travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C
- 230 V · 50 Hz
- Prices
- ≈ 31% of US
- price level, 2025
- GDP per capita
- $8,057
- 2025
- Happiness
- 6.3 / 10
- World Happiness, 2025
- Homicide rate
- 4.8
- per 100k, 2011
- Road deaths
- 32.2
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 402
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Pai (19.3617°, 98.4397°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.