Key facts
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Before you go
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- Treat mid-May to mid-October as an approximate planning frame.
- Allow for the documented one- or two-week variation in onset.
- Use current official weather and marine products for a specific date.
Detailed explanation4 short sections
Use the season as a broad planning frame
TMD explains the national rainy season through the southwest monsoon and monsoon trough, generally from around mid-May to mid-October. It also warns that the start can be earlier or later.
Pattaya is in eastern Thailand and has its own station in TMD’s detailed monthly reporting. Local totals do not follow one identical pattern every year.
A season label is not a daily forecast
“Rainy season” does not mean continuous rain, and it does not answer whether one day or one hour will be wet. Use the current Pattaya forecast and radar for an actual trip.
Do not use the broad date range to guarantee beach, boat or outdoor conditions. Marine and warning products need a separate live check.
Use the Pattaya station reports for local history
TMD's monthly climate reports include a Pattaya station and show that recorded rainfall varies by month and year. That local record adds detail without turning one year into a permanent Pattaya pattern.
The broad national framework and the Pattaya station reports serve different purposes: one outlines an approximate season, while the other records local monthly variation.
Keep date-specific claims live
The approximate range cannot establish whether rain will occur on a particular day, how long it will last or what marine conditions will be. Those questions require current official products for the intended date.
A trip can fall inside the broad rainy-season framework without the framework becoming a forecast. Preserve that uncertainty rather than promising continuous rain or guaranteed dry intervals.
Evidence
Sources
2 dated records support the material facts on this page.
- Climate of Thailand (opens in a new tab)
Thai Meteorological Departmentofficial governmentChecked
- Monthly weather summary (opens in a new tab)
Thai Meteorological Departmentofficial governmentChecked