The best time to visit Bangkok & Gulf Coast is Feb–Mar. Month by month, the verdicts rate Jan–Mar as comfortable on both daytime heat and rainfall — 3 months in all.
Wettest May–Oct (SW monsoon)
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 27.4 | 81 | 40% | Go |
| February | 27.8 | 82 | 21% | Go |
| March | 28.7 | 84 | 31% | Go |
| April | 29.7 | 85 | 45% | Fair |
| May | 29.9 | 86 | 85% | Too wet |
| June | 29.4 | 85 | 84% | Too wet |
| July | 29.0 | 84 | 87% | Too wet |
| August | 28.9 | 84 | 84% | Too wet |
| September | 28.6 | 83 | 91% | Too wet |
| October | 28.2 | 83 | 90% | Too wet |
| November | 28.1 | 83 | 82% | Too wet |
| December | 27.6 | 82 | 59% | Too wet |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
February is the driest month, with rain on 21% of days and daytime highs near 27.8°C (82°F). September is the wettest, at 91%. Temperature barely moves all year — just 2.5°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in May–Dec.