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.
Across the year, the best time to visit Chumphon is December–March.
Based on CHUMPHON, TH (1.5km), 1995–2024. 22 years of January data.