September · Thailand
Best time to visit Ayutthaya in September Weather, crowds & prices
Weather in Ayutthaya in September
Average temperature 27°C, 355 mm of rain, about 18 days with 6+ hours of sunshine and 87% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.1/10
Ranked #12 of 12 months
- Avg temp
- 27°C
- Rainfall
- 355 mm
- Humidity
- 87%
- Days with 6h+ sun
- 18
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Ayutthaya scores 3.1/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 27°C, 355 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
Ayutthaya's ruined temples and prangs recall the Siamese capital that once ruled a vast kingdom.
September in Ayutthaya: expect compromises
September averages 27°C (81°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
355 mm of rain puts this in monsoon territory — about 18 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 3.1/10 here, 12th of 12 months, against 8.5/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? December scores 5.4 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Ayutthaya in September?
- In September, Ayutthaya averages 27°C, 355 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 3.1/10.
- Is September a good time to visit Ayutthaya?
- September earns a 3.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Ayutthaya in September?
- Expect about 355 mm of rain in September. Average humidity is 87% and there are about 18 days with 6+ hours of sunshine.
Curated in Ayutthaya
Tickets & experiences
Things to do in Ayutthaya
Ayutthaya, Thailand. Live activities and tours from GetYourGuide, matched to this destination.