| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 30.9° | 21.7° | 39.5mm | 6.1 | 72 |
| February | 31.9° | 22.4° | 69.3mm | 5.9 | 69 |
| March | 33.3° | 23.6° | 50mm | 4.9 | 65 |
| April | 34.3° | 24.5° | 56mm | 5 | 61 |
| May | 33.5° | 24.6° | 198.4mm | 19.6 | 44 |
| June | 32.8° | 24.8° | 153.2mm | 18.5 | 47 |
| July | 32° | 24.2° | 222.9mm | 21.1 | 50 |
| August | 32° | 24.5° | 209mm | 21.4 | 50 |
| September | 31.7° | 24.1° | 202mm | 20.8 | 51 |
| October | 31.3° | 23.7° | 291.4mm | 20.2 | 53 |
| November | 30.6° | 23.6° | 323.7mm | 17.8 | 56 |
| December | 30.1° | 22.3° | 154.8mm | 7.3 | 73 |
January in Chumphon averages a daily high of 30.9°C with nights around 21.7°C. Expect roughly 6.1 wet days totalling 39.5mm. Generally workable, with some weather to plan around.
February in Chumphon averages a daily high of 31.9°C with nights around 22.4°C. Expect roughly 5.9 wet days totalling 69.3mm. Generally workable, with some weather to plan around.
March in Chumphon averages a daily high of 33.3°C with nights around 23.6°C. Expect roughly 4.9 wet days totalling 50mm. Generally workable, with some weather to plan around.
April in Chumphon averages a daily high of 34.3°C with nights around 24.5°C. Expect roughly 5 wet days totalling 56mm. Generally workable, with some weather to plan around.
May in Chumphon averages a daily high of 33.5°C with nights around 24.6°C. Expect roughly 19.6 wet days totalling 198.4mm. Demanding conditions — pack for it and plan indoor options.
June in Chumphon averages a daily high of 32.8°C with nights around 24.8°C. Expect roughly 18.5 wet days totalling 153.2mm. Demanding conditions — pack for it and plan indoor options.
July in Chumphon averages a daily high of 32°C with nights around 24.2°C. Expect roughly 21.1 wet days totalling 222.9mm. Demanding conditions — pack for it and plan indoor options.
August in Chumphon averages a daily high of 32°C with nights around 24.5°C. Expect roughly 21.4 wet days totalling 209mm. Demanding conditions — pack for it and plan indoor options.
September in Chumphon averages a daily high of 31.7°C with nights around 24.1°C. Expect roughly 20.8 wet days totalling 202mm. Demanding conditions — pack for it and plan indoor options.
October in Chumphon averages a daily high of 31.3°C with nights around 23.7°C. Expect roughly 20.2 wet days totalling 291.4mm. Demanding conditions — pack for it and plan indoor options.
November in Chumphon averages a daily high of 30.6°C with nights around 23.6°C. Expect roughly 17.8 wet days totalling 323.7mm. Generally workable, with some weather to plan around.
December in Chumphon averages a daily high of 30.1°C with nights around 22.3°C. Expect roughly 7.3 wet days totalling 154.8mm. 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. Chumphon peaks at 73.
Based on 30 years of records, December–March scores highest for comfort in Chumphon, balancing daytime temperature against rainfall.
April is the warmest, averaging a daily high of 34.3°C.
November is the wettest, averaging 323.7mm of rain across roughly 17.8 wet days.
December is the coolest month, with average daily highs around 30.1°C.