Udon Thani climate
Udon Thani (Thailand) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 26 °C79 °F, and about 1,323 mm52 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Udon Thani climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2985 | 1559 | 2272 | 80.3 |
| Feb | 3392 | 1965 | 2678 | 170.7 |
| Mar | 3696 | 2272 | 2984 | 391.6 |
| Apr | 3799 | 2578 | 3188 | 722.9 |
| May | 3494 | 2577 | 3085 | 1877.4 |
| Jun | 3289 | 2476 | 2882 | 1797.0 |
| Jul | 3187 | 2475 | 2781 | 2038.0 |
| Aug | 3086 | 2475 | 2780 | 25710 |
| Sep | 3086 | 2374 | 2780 | 2349.2 |
| Oct | 2984 | 2170 | 2577 | 1024.0 |
| Nov | 2984 | 1865 | 2374 | 180.7 |
| Dec | 2882 | 1559 | 2170 | 70.3 |
| Year | 3799 | 1559 | 2679 | 1,32352 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 60% | 33% | 4.8 | 11:11 |
| Feb | 52% | 33% | 5.2 | 11:33 |
| Mar | 49% | 47% | 5.2 | 11:00 |
| Apr | 52% | 58% | 5.7 | 12:31 |
| May | 69% | 82% | 5.5 | 12:56 |
| Jun | 80% | 90% | 5.1 | 13:10 |
| Jul | 83% | 92% | 4.8 | 13:04 |
| Aug | 86% | 93% | 4.6 | 12:43 |
| Sep | 87% | 84% | 4.7 | 12:13 |
| Oct | 84% | 59% | 4.9 | 11:43 |
| Nov | 77% | 40% | 4.9 | 11:17 |
| Dec | 67% | 32% | 4.6 | 11:05 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Udon Thani is like
The warmest month is April, with an average high of 37 °C99 °F and a low of 25 °C78 °F. The coldest is December, when highs average 28 °C82 °F and lows 15 °C59 °F. There is a clear seasonal cycle, with 9.9 °C17.8 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,323 mm52 in of precipitation per year. The wettest three-month stretch is July–September, which brings 52% of the annual total. Months with less than 20 mm0.8 in on average: November–February. The wettest month is August (257 mm10 in), the driest is December (7 mm0.3 in).
Relative humidity ranges from 49% in March to 87% in September. The clearest skies (lowest average cloud amount, 32%) are typical of December. Average wind speed near the ground ranges from 5 km/h (3 mph) in September to 8 km/h (5 mph) in January. Daylight lasts from about 11.1 hours in December to 13.2 hours in June.
Best time to visit Udon Thani
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–January: average highs of 28 °C82 °F to 29 °C85 °F with 7 mm0.3 in to 18 mm0.7 in of precipitation per month.
The most challenging month is August, which is very wet (257 mm10 in) and humid (86% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Udon Thani
- Wetter months (May–September) — highs 3086 to 34 °C94 °F, lows 2374 to 25 °C77 °F, about 212 mm8.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (October–April) — highs 2882 to 37 °C99 °F, lows 1559 to 25 °C78 °F, about 38 mm1.5 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Udon Thani compares
Compared with Vientiane, about 64 km to the north, Udon Thani has practically the same average temperature and receives 9% more precipitation (1,323 mm52 in vs 1,215 mm48 in). The difference is largest in February (0.8 °C1.5 °F warmer).
Of the 22 places in Thailand covered by World Climates, Udon Thani is the 21st warmest by annual mean temperature and the 15th wettest by annual precipitation. See all of them on the Thailand climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Vientiane (Laos, Aw), Savannakhet (Laos, Aw) and Rondonópolis (Brazil, Aw).
Nearby places
- Vientiane 64 km · 26 °C79 °F · 1,215 mm48 in
- Khon Kaen 108 km · 27 °C80 °F · 1,364 mm54 in
- Savannakhet 230 km · 26 °C79 °F · 1,227 mm48 in
- Nakhon Ratchasima 282 km · 27 °C80 °F · 1,220 mm48 in
- Ubon Ratchathani 327 km · 27 °C81 °F · 1,523 mm60 in
- Vinh 338 km · 25 °C78 °F · 1,774 mm70 in
- Lampang 362 km · 27 °C80 °F · 1,189 mm47 in
- Kỳ Anh 379 km · 26 °C78 °F · 1,851 mm73 in
Frequently asked questions
What is the warmest month in Udon Thani?
April is the warmest month in Udon Thani, with an average high of 37 °C (99 °F) and an average low of 25 °C (78 °F).
What is the coldest month in Udon Thani?
December is the coldest month, with an average high of 28 °C (82 °F) and an average low of 15 °C (59 °F).
When does it rain the most in Udon Thani?
August is the wettest month with about 257 mm (10.1 in) of precipitation; December is the driest with about 7 mm (0.3 in).
What is the best time to visit Udon Thani?
Judging by long-term averages, the most comfortable months are November–January.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.