Chiang Mai weather in March
In March, Chiang Mai sees average daytime highs of 35°C and overnight lows near 20°C, with 12 mm of rain across 2.1 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.
Highs climb over the month, from about 34°C in the first days to 36°C by the end. The sky is clear or mostly clear about 79% of the time in March, and the air most often feels humid.
Daylight stretches from about 11 h 36 min at the start of March to 12 h 06 min by month's end. Set against the rest of the year, March is Chiang Mai's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Chiang Mai's year-round climate.
- Daytime high
- 35°
- 2nd warmest
- Overnight low
- 20°
- 5th coldest
- Rainfall
- 12 mm
- 2.1 wet days
- Daylight
- 11 h 54 min
- 6:38 AM – 6:30 PM
- Cloud cover
- 25%
- 2nd clearest
- Wind
- 5 km/h
- 2nd windiest
- Solar energy
- 6.3 kWh/m²
- Travel score
- 3.1
- out of 10
Chiang Mai is city in Chiang Mai province, Thailand.
- Air quality
- High
- PM2.5 33 µg/m³ · 2019
- Density
- 314/km²
- people per km²
- Founded
- 1201
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in March
Highs climb over the month, from about 34°C in the first days to 36°C by the end.
A typical March day in Chiang Mai reaches about 35°C in the afternoon and slips back to 20°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 38°C. Set against its neighbours, March runs about 3°C warmer than February and about 2°C cooler than April.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| Avg low (°C) | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 34 | 18 |
| 2 | 34 | 18 |
| 3 | 34 | 18 |
| 4 | 34 | 19 |
| 5 | 34 | 19 |
| 6 | 35 | 19 |
| 7 | 35 | 19 |
| 8 | 35 | 19 |
| 9 | 35 | 19 |
| 10 | 35 | 19 |
| 11 | 35 | 19 |
| 12 | 35 | 20 |
| 13 | 35 | 20 |
| 14 | 35 | 20 |
| 15 | 35 | 20 |
| 16 | 35 | 20 |
| 17 | 35 | 20 |
| 18 | 35 | 20 |
| 19 | 35 | 21 |
| 20 | 36 | 21 |
| 21 | 36 | 21 |
| 22 | 36 | 21 |
| 23 | 36 | 21 |
| 24 | 36 | 21 |
| 25 | 36 | 21 |
| 26 | 36 | 22 |
| 27 | 36 | 22 |
| 28 | 36 | 22 |
| 29 | 36 | 22 |
| 30 | 36 | 22 |
| 31 | 36 | 22 |
How March really feels in Chiang Mai
Once humidity and wind are folded in, March averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in March is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Chiang Mai weather by month
How March compares with the rest of the year at a glance. March is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 15° | 7 | 1.3 | 11 | 6.7 |
| Feb | 33° / 17° | 3 | 0.7 | 11.4 | 5.0 |
| Mar | 35° / 20° | 12 | 2.1 | 11.9 | 3.1 |
| Apr | 37° / 24° | 26 | 4.4 | 12.4 | 1.9 |
| May | 35° / 25° | 99 | 13.2 | 12.9 | 2.3 |
| Jun | 33° / 25° | 120 | 18.3 | 13.1 | 2.5 |
| Jul | 32° / 25° | 175 | 21.9 | 13 | 2.6 |
| Aug | 31° / 25° | 236 | 25.1 | 12.6 | 2.7 |
| Sep | 31° / 24° | 227 | 23.4 | 12.1 | 2.8 |
| Oct | 31° / 22° | 114 | 15.7 | 11.6 | 4.0 |
| Nov | 30° / 19° | 21 | 4 | 11.1 | 5.8 |
| Dec | 29° / 16° | 9 | 1.2 | 10.9 | 7.2 |
Cloud cover in March
The sky is clear or mostly clear about 79% of the time in March.
Beyond those clear spells, partly cloudy skies cover about 8% of March, with mostly cloudy or overcast conditions the remaining 13%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 92 | 92 | 92 | 91 | 91 | 90 | 90 | 89 | 89 | 89 | 88 | 88 | 87 | 86 | 86 | 86 | 85 | 85 | 86 | 86 | 86 | 86 | 85 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 85 |
| Cloudier (%) | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 11 | 12 | 12 | 13 | 14 | 14 | 14 | 15 | 15 | 14 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 92 | 8 |
| 2 | 92 | 8 |
| 3 | 92 | 8 |
| 4 | 91 | 9 |
| 5 | 91 | 9 |
| 6 | 90 | 10 |
| 7 | 90 | 10 |
| 8 | 89 | 11 |
| 9 | 89 | 11 |
| 10 | 89 | 11 |
| 11 | 88 | 12 |
| 12 | 88 | 12 |
| 13 | 87 | 13 |
| 14 | 86 | 14 |
| 15 | 86 | 14 |
| 16 | 86 | 14 |
| 17 | 85 | 15 |
| 18 | 85 | 15 |
| 19 | 86 | 14 |
| 20 | 86 | 14 |
| 21 | 86 | 14 |
| 22 | 86 | 14 |
| 23 | 85 | 15 |
| 24 | 86 | 14 |
| 25 | 86 | 14 |
| 26 | 86 | 14 |
| 27 | 86 | 14 |
| 28 | 86 | 14 |
| 29 | 86 | 14 |
| 30 | 86 | 14 |
| 31 | 85 | 15 |
Chance of precipitation in March
Chiang Mai gets around 12 mm of rain over 2.1 wet days in March. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 7% and peaks near 9% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Rain chance (%) | |
|---|---|
| 1 | 4 |
| 2 | 5 |
| 3 | 5 |
| 4 | 5 |
| 5 | 5 |
| 6 | 5 |
| 7 | 5 |
| 8 | 5 |
| 9 | 5 |
| 10 | 5 |
| 11 | 5 |
| 12 | 5 |
| 13 | 6 |
| 14 | 6 |
| 15 | 6 |
| 16 | 7 |
| 17 | 7 |
| 18 | 7 |
| 19 | 8 |
| 20 | 8 |
| 21 | 8 |
| 22 | 8 |
| 23 | 9 |
| 24 | 9 |
| 25 | 9 |
| 26 | 9 |
| 27 | 9 |
| 28 | 9 |
| 29 | 9 |
| 30 | 9 |
| 31 | 9 |
Humidity in March
Most of March feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, March lands in the humid band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 16 | 16 | 15 | 15 | 14 | 14 | 13 | 12 | 12 | 11 | 10 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 |
| Comfortable (%) | 41 | 40 | 40 | 39 | 38 | 38 | 37 | 36 | 35 | 35 | 34 | 33 | 33 | 32 | 32 | 31 | 31 | 30 | 29 | 29 | 28 | 27 | 27 | 26 | 25 | 25 | 24 | 23 | 22 | 21 | 19 |
| Humid (%) | 30 | 30 | 31 | 31 | 32 | 32 | 33 | 34 | 34 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 38 | 38 | 39 | 39 |
| Muggy (%) | 13 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 17 | 17 | 18 | 19 | 20 | 21 | 21 | 22 | 23 | 24 | 25 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 32 | 33 | 34 | 35 |
| Oppressive (%) | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 4 | 4 | 4 | 4 | 5 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 16 | 41 | 30 | 13 | 1 |
| 2 | 16 | 40 | 30 | 13 | 1 |
| 3 | 15 | 40 | 31 | 13 | 1 |
| 4 | 15 | 39 | 31 | 14 | 1 |
| 5 | 14 | 38 | 32 | 14 | 1 |
| 6 | 14 | 38 | 32 | 15 | 2 |
| 7 | 13 | 37 | 33 | 15 | 2 |
| 8 | 12 | 36 | 34 | 16 | 2 |
| 9 | 12 | 35 | 34 | 17 | 2 |
| 10 | 11 | 35 | 35 | 17 | 2 |
| 11 | 10 | 34 | 35 | 18 | 2 |
| 12 | 10 | 33 | 36 | 19 | 2 |
| 13 | 9 | 33 | 36 | 20 | 2 |
| 14 | 9 | 32 | 36 | 21 | 2 |
| 15 | 8 | 32 | 36 | 21 | 3 |
| 16 | 7 | 31 | 36 | 22 | 3 |
| 17 | 7 | 31 | 37 | 23 | 3 |
| 18 | 6 | 30 | 37 | 24 | 3 |
| 19 | 5 | 29 | 37 | 25 | 4 |
| 20 | 5 | 29 | 37 | 25 | 4 |
| 21 | 4 | 28 | 37 | 26 | 4 |
| 22 | 4 | 27 | 37 | 27 | 4 |
| 23 | 4 | 27 | 37 | 28 | 4 |
| 24 | 3 | 26 | 37 | 29 | 4 |
| 25 | 3 | 25 | 37 | 30 | 5 |
| 26 | 3 | 25 | 37 | 31 | 5 |
| 27 | 3 | 24 | 37 | 32 | 4 |
| 28 | 3 | 23 | 38 | 32 | 4 |
| 29 | 2 | 22 | 38 | 33 | 4 |
| 30 | 2 | 21 | 39 | 34 | 4 |
| 31 | 2 | 19 | 39 | 35 | 5 |
Wind in March
Winds average 5 km/h in March.
Across March, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in March
Daylight runs from about 11 h 36 min at the start of March to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 30 minutes over March. Sunrise moves from 6:49 AM to 6:25 AM, and sunset from 6:25 PM to 6:33 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.6 | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 |
| Sunrise (AM) | 6:49 | 6:49 | 6:48 | 6:47 | 6:46 | 6:46 | 6:45 | 6:44 | 6:43 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 | 6:34 | 6:33 | 6:33 | 6:32 | 6:31 | 6:30 | 6:29 | 6:28 | 6:27 | 6:27 | 6:26 | 6:25 |
| Sunset (PM) | 6:25 | 6:26 | 6:26 | 6:26 | 6:27 | 6:27 | 6:27 | 6:28 | 6:28 | 6:28 | 6:28 | 6:29 | 6:29 | 6:29 | 6:29 | 6:30 | 6:30 | 6:30 | 6:30 | 6:31 | 6:31 | 6:31 | 6:31 | 6:32 | 6:32 | 6:32 | 6:32 | 6:33 | 6:33 | 6:33 | 6:33 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 6:49 | 6:25 |
| 2 | 11.6 | 6:49 | 6:26 |
| 3 | 11.6 | 6:48 | 6:26 |
| 4 | 11.7 | 6:47 | 6:26 |
| 5 | 11.7 | 6:46 | 6:27 |
| 6 | 11.7 | 6:46 | 6:27 |
| 7 | 11.7 | 6:45 | 6:27 |
| 8 | 11.7 | 6:44 | 6:28 |
| 9 | 11.7 | 6:43 | 6:28 |
| 10 | 11.8 | 6:43 | 6:28 |
| 11 | 11.8 | 6:42 | 6:28 |
| 12 | 11.8 | 6:41 | 6:29 |
| 13 | 11.8 | 6:40 | 6:29 |
| 14 | 11.8 | 6:39 | 6:29 |
| 15 | 11.8 | 6:39 | 6:29 |
| 16 | 11.9 | 6:38 | 6:30 |
| 17 | 11.9 | 6:37 | 6:30 |
| 18 | 11.9 | 6:36 | 6:30 |
| 19 | 11.9 | 6:35 | 6:30 |
| 20 | 11.9 | 6:34 | 6:31 |
| 21 | 12.0 | 6:33 | 6:31 |
| 22 | 12.0 | 6:33 | 6:31 |
| 23 | 12.0 | 6:32 | 6:31 |
| 24 | 12.0 | 6:31 | 6:32 |
| 25 | 12.0 | 6:30 | 6:32 |
| 26 | 12.1 | 6:29 | 6:32 |
| 27 | 12.1 | 6:28 | 6:32 |
| 28 | 12.1 | 6:27 | 6:33 |
| 29 | 12.1 | 6:27 | 6:33 |
| 30 | 12.1 | 6:26 | 6:33 |
| 31 | 12.1 | 6:25 | 6:33 |
Solar energy in March
Average shortwave solar energy reaching the ground each day in March, about 6.3 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 3.96 kWh/m² to a high of 6.3 kWh/m² in March across the year — March's 6.3 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.1 | Intense |
| 2 | 6.1 | Intense |
| 3 | 6.1 | Intense |
| 4 | 6.2 | Intense |
| 5 | 6.2 | Intense |
| 6 | 6.2 | Intense |
| 7 | 6.2 | Intense |
| 8 | 6.2 | Intense |
| 9 | 6.3 | Intense |
| 10 | 6.3 | Intense |
| 11 | 6.3 | Intense |
| 12 | 6.3 | Intense |
| 13 | 6.3 | Intense |
| 14 | 6.3 | Intense |
| 15 | 6.3 | Intense |
| 16 | 6.3 | Intense |
| 17 | 6.3 | Intense |
| 18 | 6.3 | Intense |
| 19 | 6.3 | Intense |
| 20 | 6.3 | Intense |
| 21 | 6.4 | Intense |
| 22 | 6.4 | Intense |
| 23 | 6.4 | Intense |
| 24 | 6.4 | Intense |
| 25 | 6.4 | Intense |
| 26 | 6.4 | Intense |
| 27 | 6.4 | Intense |
| 28 | 6.4 | Intense |
| 29 | 6.4 | Intense |
| 30 | 6.4 | Intense |
| 31 | 6.4 | Intense |
Hazard calendar for Chiang Mai
None of Chiang Mai's seasonal hazards are active in March. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Chiang Mai's monsoon runs June–October, when most of the year's rain falls.
Is March a good time to visit Chiang Mai?
Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
March is a weaker month for outdoor sightseeing in Chiang Mai. The water and warmth also suit a beach or pool day.
What to pack for Chiang Mai in March
From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In March, Chiang Mai sees daytime highs around 35°C and nights near 20°C. Pack light clothes and sun protection.
UV index in Chiang Mai in March
Clear-sky midday UV in March peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chiang Mai peaks around August 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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) | 7 | 9 | 9 | 10 | 12 | 13 | 13 | 14 | 12 | 10 | 8 | 7 |
| Level | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | Very high |
| Feb | 9 | Very high |
| Mar | 9 | Very high |
| Apr | 10 | Very high |
| May | 12 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | Very high |
Air quality in Chiang Mai in March
Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.
Air quality in Chiang Mai is worst in March — around 69 µg/m³ PM2.5 (unhealthy), about 4.3× the cleanest month (July, 16 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Chiang Mai's WHO annual average of 33 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 37 | 46 | 69 | 60 | 28 | 16 | 16 | 17 | 21 | 25 | 28 | 32 |
| Level | Poor | Poor | Unhealthy | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 37 | Poor |
| Feb | 46 | Poor |
| Mar | 69 | Unhealthy |
| Apr | 60 | Unhealthy |
| May | 28 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 17 | Moderate |
| Sep | 21 | Moderate |
| Oct | 25 | Moderate |
| Nov | 28 | Moderate |
| Dec | 32 | Moderate |
Where is Chiang Mai?
Chiang Mai sits at 18.8°N, 99.0°E, 313 m above sea level, in Thailand. The nearest listed city is Hang Dong, 13 km away.
Topography around Chiang Mai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiang Mai.
Within 3 km, the terrain around Chiang Mai has only modest variations in elevation — a maximum elevation change of 45 m around an average of 313 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,399 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,341 m.
The land around Chiang Mai is covered by artificial surfaces (72%) and trees (22%) within 3 km, trees (57%) and artificial surfaces (21%) within 16 km, and trees (84%) 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 Chiang Mai (18.7904°, 98.9847°, elevation 313 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).