| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 30.9° | 21.3° | 14.5mm | 4 | 76 |
| February | 32.6° | 21.6° | 8.6mm | 1.9 | 74 |
| March | 34.3° | 22.3° | 36.1mm | 3.7 | 63 |
| April | 35.4° | 23.5° | 43.1mm | 3.6 | 59 |
| May | 34.6° | 23.7° | 129.7mm | 13.4 | 43 |
| June | 33.8° | 23.5° | 180.1mm | 18 | 43 |
| July | 33.1° | 23.2° | 184.2mm | 19.1 | 46 |
| August | 33.3° | 23.4° | 178mm | 18.4 | 45 |
| September | 32.9° | 23.4° | 203.8mm | 20.5 | 46 |
| October | 32° | 23.2° | 230.4mm | 21.5 | 50 |
| November | 30.8° | 22.9° | 323.8mm | 19.4 | 55 |
| December | 30° | 22.3° | 182.8mm | 13.8 | 60 |
January in Surat Thani averages a daily high of 30.9°C with nights around 21.3°C. Expect roughly 4 wet days totalling 14.5mm. Comfortable conditions for being outdoors all day.
February in Surat Thani averages a daily high of 32.6°C with nights around 21.6°C. Rain is rare — about 1.9 wet days and 8.6mm across the month. Generally workable, with some weather to plan around.
March in Surat Thani averages a daily high of 34.3°C with nights around 22.3°C. Expect roughly 3.7 wet days totalling 36.1mm. Generally workable, with some weather to plan around.
April in Surat Thani averages a daily high of 35.4°C with nights around 23.5°C. Expect roughly 3.6 wet days totalling 43.1mm. Generally workable, with some weather to plan around.
May in Surat Thani averages a daily high of 34.6°C with nights around 23.7°C. Expect roughly 13.4 wet days totalling 129.7mm. Demanding conditions — pack for it and plan indoor options.
June in Surat Thani averages a daily high of 33.8°C with nights around 23.5°C. Expect roughly 18 wet days totalling 180.1mm. Demanding conditions — pack for it and plan indoor options.
July in Surat Thani averages a daily high of 33.1°C with nights around 23.2°C. Expect roughly 19.1 wet days totalling 184.2mm. Demanding conditions — pack for it and plan indoor options.
August in Surat Thani averages a daily high of 33.3°C with nights around 23.4°C. Expect roughly 18.4 wet days totalling 178mm. Demanding conditions — pack for it and plan indoor options.
September in Surat Thani averages a daily high of 32.9°C with nights around 23.4°C. Expect roughly 20.5 wet days totalling 203.8mm. Demanding conditions — pack for it and plan indoor options.
October in Surat Thani averages a daily high of 32°C with nights around 23.2°C. Expect roughly 21.5 wet days totalling 230.4mm. Demanding conditions — pack for it and plan indoor options.
November in Surat Thani averages a daily high of 30.8°C with nights around 22.9°C. Expect roughly 19.4 wet days totalling 323.8mm. Generally workable, with some weather to plan around.
December in Surat Thani averages a daily high of 30°C with nights around 22.3°C. Expect roughly 13.8 wet days totalling 182.8mm. Generally workable, with some weather to plan around.
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. Surat Thani peaks at 76.
Based on 30 years of records, January–February scores highest for comfort in Surat Thani, balancing daytime temperature against rainfall.
April is the warmest, averaging a daily high of 35.4°C.
November is the wettest, averaging 323.8mm of rain across roughly 19.4 wet days.
December is the coolest month, with average daily highs around 30°C.