Chiang Rai weather in April
In April, Chiang Rai sees average daytime highs of 34°C and overnight lows near 21°C, with 132 mm of rain across 11.8 wet days and about 12.4 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.
Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 54% of the time in April, and the air most often feels muggy.
Daylight stretches from about 12 h 12 min at the start of April to 12 h 42 min by month's end. Set against the rest of the year, April is Chiang Rai's 6th-clearest and 2nd-windiest month. For the whole year in context, see Chiang Rai's year-round climate.
- Daytime high
- 34°
- 1st warmest
- Overnight low
- 21°
- 6th coldest
- Rainfall
- 132 mm
- 11.8 wet days
- Daylight
- 12 h 30 min
- 6:07 AM – 6:35 PM
- Cloud cover
- 44%
- 6th clearest
- Wind
- 5 km/h
- 2nd windiest
- Solar energy
- 6.3 kWh/m²
- Travel score
- 3.1
- out of 10
Chiang Rai is city in Chiang Rai province, Thailand.
- Air quality
- Very high
- PM2.5 37 µg/m³ · 2019
- Density
- 1,294/km²
- people per km²
- Founded
- 1936
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Day-to-day highs hold fairly steady near 34°C through the month.
A typical April day in Chiang Rai reaches about 34°C in the afternoon and slips back to 21°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 38°C. Set against its neighbours, April runs on par with March and about 2°C warmer than May.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 |
| Avg low (°C) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 34 | 20 |
| 2 | 34 | 20 |
| 3 | 34 | 20 |
| 4 | 34 | 20 |
| 5 | 34 | 20 |
| 6 | 34 | 20 |
| 7 | 34 | 20 |
| 8 | 34 | 21 |
| 9 | 34 | 21 |
| 10 | 34 | 21 |
| 11 | 34 | 21 |
| 12 | 34 | 21 |
| 13 | 34 | 21 |
| 14 | 34 | 21 |
| 15 | 34 | 21 |
| 16 | 34 | 21 |
| 17 | 34 | 21 |
| 18 | 34 | 22 |
| 19 | 34 | 22 |
| 20 | 34 | 22 |
| 21 | 34 | 22 |
| 22 | 34 | 22 |
| 23 | 34 | 22 |
| 24 | 34 | 22 |
| 25 | 33 | 22 |
| 26 | 33 | 22 |
| 27 | 33 | 22 |
| 28 | 33 | 22 |
| 29 | 33 | 22 |
| 30 | 33 | 22 |
How April really feels in Chiang Rai
Once humidity and wind are folded in, April averages 30 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 April is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Chiang Rai weather by month
How April compares with the rest of the year at a glance. April is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 28° / 14° | 22 | 3 | 10.9 | 7.7 |
| Feb | 31° / 15° | 13 | 2.4 | 11.3 | 5.9 |
| Mar | 33° / 18° | 42 | 5.1 | 11.9 | 4.1 |
| Apr | 34° / 21° | 132 | 11.8 | 12.4 | 3.1 |
| May | 32° / 23° | 292 | 22.8 | 12.9 | 2.8 |
| Jun | 31° / 24° | 297 | 26.2 | 13.2 | 2.5 |
| Jul | 31° / 24° | 398 | 28.4 | 13.1 | 2.6 |
| Aug | 30° / 24° | 383 | 28.8 | 12.7 | 2.6 |
| Sep | 30° / 23° | 295 | 25.1 | 12.1 | 3.0 |
| Oct | 30° / 22° | 139 | 17.8 | 11.5 | 4.4 |
| Nov | 28° / 18° | 49 | 6.7 | 11.1 | 6.7 |
| Dec | 26° / 15° | 27 | 3.7 | 10.8 | 8.0 |
Cloud cover in April
The sky is clear or mostly clear about 54% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 18% of April, with mostly cloudy or overcast conditions the remaining 27%. 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 80 | 79 | 79 | 79 | 78 | 78 | 77 | 76 | 76 | 76 | 74 | 74 | 74 | 73 | 73 | 73 | 72 | 72 | 71 | 71 | 70 | 70 | 70 | 69 | 69 | 68 | 68 | 67 | 66 | 64 |
| Cloudier (%) | 20 | 21 | 21 | 21 | 22 | 22 | 23 | 24 | 24 | 24 | 26 | 26 | 26 | 27 | 27 | 27 | 28 | 28 | 29 | 29 | 30 | 30 | 30 | 31 | 31 | 32 | 32 | 33 | 34 | 36 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 80 | 20 |
| 2 | 79 | 21 |
| 3 | 79 | 21 |
| 4 | 79 | 21 |
| 5 | 78 | 22 |
| 6 | 78 | 22 |
| 7 | 77 | 23 |
| 8 | 76 | 24 |
| 9 | 76 | 24 |
| 10 | 76 | 24 |
| 11 | 74 | 26 |
| 12 | 74 | 26 |
| 13 | 74 | 26 |
| 14 | 73 | 27 |
| 15 | 73 | 27 |
| 16 | 73 | 27 |
| 17 | 72 | 28 |
| 18 | 72 | 28 |
| 19 | 71 | 29 |
| 20 | 71 | 29 |
| 21 | 70 | 30 |
| 22 | 70 | 30 |
| 23 | 70 | 30 |
| 24 | 69 | 31 |
| 25 | 69 | 31 |
| 26 | 68 | 32 |
| 27 | 68 | 32 |
| 28 | 67 | 33 |
| 29 | 66 | 34 |
| 30 | 64 | 36 |
Chance of precipitation in April
Chiang Rai gets around 132 mm of rain over 11.8 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 40% and peaks near 58% on the wettest days. The odds climb toward the end of the month.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 27 | 27 | 28 | 28 | 29 | 29 | 30 | 31 | 32 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 40 | 41 | 42 | 44 | 45 | 46 | 48 | 49 | 51 | 52 | 54 | 55 | 57 | 58 |
| Rain chance (%) | |
|---|---|
| 1 | 27 |
| 2 | 27 |
| 3 | 28 |
| 4 | 28 |
| 5 | 29 |
| 6 | 29 |
| 7 | 30 |
| 8 | 31 |
| 9 | 32 |
| 10 | 32 |
| 11 | 33 |
| 12 | 34 |
| 13 | 35 |
| 14 | 36 |
| 15 | 37 |
| 16 | 38 |
| 17 | 40 |
| 18 | 41 |
| 19 | 42 |
| 20 | 44 |
| 21 | 45 |
| 22 | 46 |
| 23 | 48 |
| 24 | 49 |
| 25 | 51 |
| 26 | 52 |
| 27 | 54 |
| 28 | 55 |
| 29 | 57 |
| 30 | 58 |
Humidity in April
Most of April feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the muggy band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 79% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 12 | 10 | 9 | 8 | 8 | 7 | 6 | 5 | 5 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | 34 | 34 | 33 | 32 | 31 | 30 | 29 | 28 | 26 | 25 | 24 | 22 | 21 | 19 | 18 | 16 | 14 | 13 | 11 | 10 | 9 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 |
| Muggy (%) | 45 | 46 | 47 | 47 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 47 | 46 | 45 | 44 | 42 | 40 | 38 | 37 | 35 | 33 |
| Oppressive (%) | 9 | 10 | 11 | 12 | 13 | 15 | 16 | 18 | 20 | 22 | 24 | 25 | 27 | 29 | 31 | 33 | 35 | 37 | 39 | 41 | 43 | 45 | 47 | 49 | 52 | 55 | 57 | 59 | 61 | 63 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 12 | 34 | 45 | 9 |
| 2 | 10 | 34 | 46 | 10 |
| 3 | 9 | 33 | 47 | 11 |
| 4 | 8 | 32 | 47 | 12 |
| 5 | 8 | 31 | 48 | 13 |
| 6 | 7 | 30 | 48 | 15 |
| 7 | 6 | 29 | 48 | 16 |
| 8 | 5 | 28 | 49 | 18 |
| 9 | 5 | 26 | 49 | 20 |
| 10 | 4 | 25 | 49 | 22 |
| 11 | 3 | 24 | 49 | 24 |
| 12 | 3 | 22 | 50 | 25 |
| 13 | 2 | 21 | 50 | 27 |
| 14 | 2 | 19 | 50 | 29 |
| 15 | 2 | 18 | 50 | 31 |
| 16 | 1 | 16 | 50 | 33 |
| 17 | 1 | 14 | 49 | 35 |
| 18 | 1 | 13 | 49 | 37 |
| 19 | 1 | 11 | 49 | 39 |
| 20 | 1 | 10 | 48 | 41 |
| 21 | 1 | 9 | 47 | 43 |
| 22 | 1 | 8 | 46 | 45 |
| 23 | 1 | 7 | 45 | 47 |
| 24 | 0 | 6 | 44 | 49 |
| 25 | 0 | 6 | 42 | 52 |
| 26 | 0 | 5 | 40 | 55 |
| 27 | 0 | 5 | 38 | 57 |
| 28 | 0 | 4 | 37 | 59 |
| 29 | 0 | 4 | 35 | 61 |
| 30 | 0 | 4 | 33 | 63 |
Wind in April
Winds average 5 km/h in April.
Across April, daily wind ranges from about 5 km/h on the calmest days to 5 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 5 | 5 |
| 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 |
| 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 | 5 | calm |
| 30 | 5 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 12 min at the start of April to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 30 minutes over April. Sunrise moves from 6:20 AM to 5:57 AM, and sunset from 6:30 PM to 6:39 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 |
| Sunrise (AM) | 6:20 | 6:19 | 6:18 | 6:18 | 6:17 | 6:16 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:11 | 6:10 | 6:09 | 6:08 | 6:07 | 6:06 | 6:06 | 6:05 | 6:04 | 6:03 | 6:03 | 6:02 | 6:01 | 6:00 | 6:00 | 5:59 | 5:58 | 5:58 | 5:57 |
| Sunset (PM) | 6:30 | 6:31 | 6:31 | 6:31 | 6:31 | 6:32 | 6:32 | 6:32 | 6:33 | 6:33 | 6:33 | 6:33 | 6:34 | 6:34 | 6:34 | 6:35 | 6:35 | 6:35 | 6:35 | 6:36 | 6:36 | 6:36 | 6:37 | 6:37 | 6:37 | 6:38 | 6:38 | 6:38 | 6:39 | 6:39 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.2 | 6:20 | 6:30 |
| 2 | 12.2 | 6:19 | 6:31 |
| 3 | 12.2 | 6:18 | 6:31 |
| 4 | 12.2 | 6:18 | 6:31 |
| 5 | 12.2 | 6:17 | 6:31 |
| 6 | 12.3 | 6:16 | 6:32 |
| 7 | 12.3 | 6:15 | 6:32 |
| 8 | 12.3 | 6:14 | 6:32 |
| 9 | 12.3 | 6:13 | 6:33 |
| 10 | 12.3 | 6:12 | 6:33 |
| 11 | 12.4 | 6:11 | 6:33 |
| 12 | 12.4 | 6:11 | 6:33 |
| 13 | 12.4 | 6:10 | 6:34 |
| 14 | 12.4 | 6:09 | 6:34 |
| 15 | 12.4 | 6:08 | 6:34 |
| 16 | 12.5 | 6:07 | 6:35 |
| 17 | 12.5 | 6:06 | 6:35 |
| 18 | 12.5 | 6:06 | 6:35 |
| 19 | 12.5 | 6:05 | 6:35 |
| 20 | 12.5 | 6:04 | 6:36 |
| 21 | 12.5 | 6:03 | 6:36 |
| 22 | 12.6 | 6:03 | 6:36 |
| 23 | 12.6 | 6:02 | 6:37 |
| 24 | 12.6 | 6:01 | 6:37 |
| 25 | 12.6 | 6:00 | 6:37 |
| 26 | 12.6 | 6:00 | 6:38 |
| 27 | 12.6 | 5:59 | 6:38 |
| 28 | 12.7 | 5:58 | 6:38 |
| 29 | 12.7 | 5:58 | 6:39 |
| 30 | 12.7 | 5:57 | 6:39 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 6.3 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 4.1 kWh/m² to a high of 6.3 kWh/m² in April across the year — April'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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.2 | 6.2 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.3 | Intense |
| 2 | 6.3 | Intense |
| 3 | 6.3 | Intense |
| 4 | 6.3 | Intense |
| 5 | 6.3 | Intense |
| 6 | 6.3 | Intense |
| 7 | 6.3 | Intense |
| 8 | 6.4 | Intense |
| 9 | 6.4 | Intense |
| 10 | 6.4 | 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 | 6.3 | Intense |
| 22 | 6.2 | Intense |
| 23 | 6.2 | Intense |
| 24 | 6.2 | Intense |
| 25 | 6.2 | Intense |
| 26 | 6.1 | Intense |
| 27 | 6.1 | Intense |
| 28 | 6.1 | Intense |
| 29 | 6.0 | Intense |
| 30 | 6.0 | Intense |
Hazard calendar for Chiang Rai
None of Chiang Rai's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Chiang Rai's monsoon runs May–September, when most of the year's rain falls.
Is April a good time to visit Chiang Rai?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a weaker month for outdoor sightseeing in Chiang Rai.
What to pack for Chiang Rai in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Chiang Rai sees daytime highs around 34°C and nights near 21°C. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.
UV index in Chiang Rai in April
Clear-sky midday UV in April peaks 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 Chiang Rai peaks around July 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 7 (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 | 11 | 13 | 13 | 13 | 11 | 10 | 8 | 7 |
| Level | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | Very high |
| Feb | 9 | Very high |
| Mar | 9 | Very high |
| Apr | 10 | Very high |
| May | 11 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Very high |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Chiang Rai in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Chiang Rai is worst in April — around 142 µg/m³ PM2.5 (unhealthy), about 12.0× the cleanest month (July, 12 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Chiang Rai's WHO annual average of 37 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 21 | 36 | 117 | 142 | 34 | 14 | 12 | 12 | 12 | 13 | 14 | 17 |
| Level | Moderate | Poor | Unhealthy | Unhealthy | Moderate | Moderate | Good | Good | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 21 | Moderate |
| Feb | 36 | Poor |
| Mar | 117 | Unhealthy |
| Apr | 142 | Unhealthy |
| May | 34 | Moderate |
| Jun | 14 | Moderate |
| Jul | 12 | Good |
| Aug | 12 | Good |
| Sep | 12 | Moderate |
| Oct | 13 | Moderate |
| Nov | 14 | Moderate |
| Dec | 17 | Moderate |
Where is Chiang Rai?
Chiang Rai sits at 19.9°N, 99.8°E, 401 m above sea level, in Thailand. The nearest listed city is Mae Chan, 27 km away.
Topography around Chiang Rai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiang Rai.
Within 3 km, the terrain around Chiang Rai has only modest variations in elevation — a maximum elevation change of 66 m around an average of 398 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 815 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,937 m.
The land around Chiang Rai is covered by artificial surfaces (43%) and trees (36%) within 3 km, trees (52%) and cropland (33%) within 16 km, and trees (70%) and cropland (21%) 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 Rai (19.9086°, 99.8325°, elevation 401 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).