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The best time to visit Phuket is November to April, when the sea is calm and the skies are clear at 24°C to 32°C. That is what makes the boat trips to Phi Phi and James Bond Island reliable rather than a gamble.
April is the hottest month but still dry. May to October is the southwest monsoon: short heavy bursts of rain, rough seas, and island tours cancelled at short notice. Rates are the lowest of the year.
If your dates are fixed in the monsoon months, Koh Samui on the Gulf coast stays dry and is the better swap. Krabi shares Phuket’s calendar exactly.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 30°/ 23° | 2 days |
| February | 30°/ 24° | 2 days |
| March | 30°/ 24° | 3 days |
| April | 30°/ 25° | 20 days |
| May | 29°/ 25° | 20 days |
| June | 29°/ 25° | 21 days |
| July | 29°/ 25° | 5 days |
| August | 29°/ 25° | 23 days |
| September | 28°/ 24° | 15 days |
| October | 28°/ 24° | 28 days |
| November | 28°/ 24° | 21 days |
| December | 29°/ 23° | 10 days |