| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 30.4° | 16.2° | 2.3mm | 1.1 | 84 |
| February | 32.5° | 18.5° | 47.7mm | 3.9 | 70 |
| March | 35.2° | 21.4° | 61.6mm | 5 | 57 |
| April | 36.6° | 24.5° | 73.9mm | 7.6 | 46 |
| May | 34.8° | 24.6° | 187.4mm | 17.4 | 39 |
| June | 33.7° | 25° | 222.1mm | 19.1 | 43 |
| July | 32.8° | 24.9° | 249.6mm | 22.3 | 47 |
| August | 32.4° | 24.4° | 319.9mm | 23 | 48 |
| September | 32.1° | 23.9° | 265.5mm | 20 | 50 |
| October | 32.3° | 22.7° | 84.1mm | 7 | 65 |
| November | 31.5° | 19.3° | 21.9mm | 2.8 | 76 |
| December | 29.6° | 16.7° | 0.8mm | 0.6 | 88 |
January in Udon Thani averages a daily high of 30.4°C with nights around 16.2°C. Rain is rare — about 1.1 wet days and 2.3mm across the month. Comfortable conditions for being outdoors all day.
February in Udon Thani averages a daily high of 32.5°C with nights around 18.5°C. Expect roughly 3.9 wet days totalling 47.7mm. Generally workable, with some weather to plan around.
March in Udon Thani averages a daily high of 35.2°C with nights around 21.4°C. Expect roughly 5 wet days totalling 61.6mm. Generally workable, with some weather to plan around.
April in Udon Thani averages a daily high of 36.6°C with nights around 24.5°C. Expect roughly 7.6 wet days totalling 73.9mm. Demanding conditions — pack for it and plan indoor options.
May in Udon Thani averages a daily high of 34.8°C with nights around 24.6°C. Expect roughly 17.4 wet days totalling 187.4mm. Demanding conditions — pack for it and plan indoor options.
June in Udon Thani averages a daily high of 33.7°C with nights around 25°C. Expect roughly 19.1 wet days totalling 222.1mm. Demanding conditions — pack for it and plan indoor options.
July in Udon Thani averages a daily high of 32.8°C with nights around 24.9°C. Expect roughly 22.3 wet days totalling 249.6mm. Demanding conditions — pack for it and plan indoor options.
August in Udon Thani averages a daily high of 32.4°C with nights around 24.4°C. Expect roughly 23 wet days totalling 319.9mm. Demanding conditions — pack for it and plan indoor options.
September in Udon Thani averages a daily high of 32.1°C with nights around 23.9°C. Expect roughly 20 wet days totalling 265.5mm. Demanding conditions — pack for it and plan indoor options.
October in Udon Thani averages a daily high of 32.3°C with nights around 22.7°C. Expect roughly 7 wet days totalling 84.1mm. Generally workable, with some weather to plan around.
November in Udon Thani averages a daily high of 31.5°C with nights around 19.3°C. Rain is rare — about 2.8 wet days and 21.9mm across the month. Comfortable conditions for being outdoors all day.
December in Udon Thani averages a daily high of 29.6°C with nights around 16.7°C. Rain is rare — about 0.6 wet days and 0.8mm across the month. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Udon Thani peaks at 88.
Based on 30 years of records, December–January scores highest for comfort in Udon Thani, balancing daytime temperature against rainfall.
April is the warmest, averaging a daily high of 36.6°C.
August is the wettest, averaging 319.9mm of rain across roughly 23 wet days.
December is the coolest month, with average daily highs around 29.6°C.