Pattaya Weather in September
Pattaya in September: average high 29.8°C, low 25.7°C, 245.9 mm of rain on 23.8 days (2016-2025 averages).
In September, Pattaya averages a daytime high of 29.8°C and an overnight low of 25.7°C. Across 2016-2025, the month brought 245.9 mm of rain on 23.8 days with more than 1 mm of precipitation, with average relative humidity of 83%. Compared with the other months in the same dataset, September is wetter than the average month and close to the average month for daytime heat.
These figures are averages computed from ten years of daily Open-Meteo (ERA5 reanalysis) data for the grid cell nearest Pattaya, not readings from a single weather station. Any one year can run wetter, drier, hotter or cooler than the average.
Pattaya September climate at a glance
| Measure | September average (2016-2025) |
|---|---|
| Average daily high | 29.8°C |
| Average daily low | 25.7°C |
| Average monthly rainfall | 245.9 mm |
| Average rainy days (over 1 mm) | 23.8 |
| Average relative humidity | 83% |
What to pack for Pattaya in September
- A light, packable rain jacket or a compact umbrella — rain falls on a large share of days this month.
- Breathable, quick-drying clothing; humidity and daytime heat are part of every month in Pattaya.
- Sun protection (hat, sunglasses, reapplied sunscreen) for beach and boat days.
- A waterproof cover or dry bag for phones, passports and cameras on motorbike and boat trips.
- Sandals or shoes that cope with wet pavement — street drainage can pool after heavy showers.
Rainfall this month is above the 12-month average, so build slack into outdoor and island plans.