Ayutthaya weather in September
September in Ayutthaya: hot, soaked, with very humid — not the time — 26 rainy days.
#12 of 12 months in Ayutthaya · #857 of 897 destinations to visit in September · comfort 49/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
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Ayutthaya climate normals — September
| Daytime high | 31°C / 88°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 293 mm / 11.5 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 7.7 h/day | |
| Daylight | 12.2 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 62 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ayutthaya in September — FAQ
- Is September a good time to visit Ayutthaya?
- September in Ayutthaya: hot, soaked, with very humid — not the time — 26 rainy days. It ranks #12 of 12 months for Ayutthaya on SeasonMap's comfort score (49/100).
- What is the weather like in Ayutthaya in September?
- In September, Ayutthaya averages a daily high of 31.3°C and a low of 24.8°C, with about 293 mm of rain over roughly 25.8 rainy days.
- What is the air quality in Ayutthaya in September?
- Ayutthaya has a mean US Air Quality Index of about 62 in September.