Climate averages 1991–2020
Ban I Chang weather
in September.
A hot, very wet month: the 9th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Ban I Chang: daytime highs average 31.3°C and nights cool to about 24.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 236 mm of rain on roughly 25 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average September day.
The nearest other city in this atlas is Nakhon Pathom (20 km away). In September its highs average 31.3°C, about as warm as Ban I Chang, with 236 mm of rain.
Among the 46 cities listed in Thailand, Ban I Chang ranks joint 2nd of 46 for the warmest September highs and joint 15th of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Ban I Chang is 0.9°C warmer than that mean.
From September to October, average highs fall by 0.9°C to 30.4°C, and monthly rainfall falls from 236 mm to 221 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Ban I Chang climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.4°C21.3°C | 21.3°C | 17 | 2.6 | 11.411 h |
| February | 33.2°C22.6°C | 22.6°C | 15 | 3.0 | 11.712 h |
| March | 34.8°C24.5°C | 24.5°C | 46 | 7.3 | 12.012 h |
| April | 35.8°C26.0°C | 26.0°C | 82 | 11.4 | 12.412 h |
| May | 34.2°C26.0°C | 26.0°C | 141 | 21.8 | 12.813 h |
| June | 33.0°C25.6°C | 25.6°C | 130 | 22.0 | 12.913 h |
| July | 32.2°C25.2°C | 25.2°C | 137 | 22.7 | 12.913 h |
| August | 31.7°C25.0°C | 25.0°C | 151 | 23.5 | 12.613 h |
| September, selected | 31.3°C24.6°C | 24.6°C | 236 | 24.9 | 12.212 h |
| October | 30.4°C23.8°C | 23.8°C | 221 | 21.4 | 11.812 h |
| November | 30.7°C22.9°C | 22.9°C | 55 | 7.2 | 11.512 h |
| December | 30.6°C21.5°C | 21.5°C | 12 | 2.3 | 11.311 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Nakhon Pathom in SeptemberThailand · 20 kmHigh 31.3°C · Low 24.7°C · 236 mm rain
- Ratchaburi in SeptemberThailand · 21 kmHigh 31.0°C · Low 24.6°C · 197 mm rain
- Nong Khaem in SeptemberThailand · 49 kmHigh 30.9°C · Low 25.1°C · 245 mm rain
- Thawi Watthana in SeptemberThailand · 53 kmHigh 31.1°C · Low 25.0°C · 237 mm rain
- Ban Samae Dam in SeptemberThailand · 55 kmHigh 30.5°C · Low 25.5°C · 212 mm rain
- Bang Khae in SeptemberThailand · 55 kmHigh 30.9°C · Low 25.2°C · 237 mm rain
- Bangkok in SeptemberThailand · 66 kmHigh 30.9°C · Low 24.9°C · 237 mm rain
- Thung Khru in SeptemberThailand · 67 kmHigh 30.5°C · Low 25.5°C · 237 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ban I Chang) is explained once on the Ban I Chang year overview and on the Sources, method and limits page.
Nakhon Pathom lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.