Climate averages 1991–2020
Chon Buri weather
in September.
A hot, very wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Chon Buri: daytime highs average 30.4°C and nights cool to about 25.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 232 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 Si Racha (22 km away). In September its highs average 30.1°C, about as warm as Chon Buri, with 232 mm of rain.
Among the 46 cities listed in Thailand, Chon Buri ranks joint 24th of 46 for the warmest September highs and joint 13th of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Chon Buri is 0.1°C warmer than that mean.
From September to October, average highs fall by 0.2°C to 30.2°C, and monthly rainfall falls from 232 mm to 195 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
Chon Buri climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.4°C22.1°C | 22.1°C | 22 | 4.7 | 11.411 h |
| February | 32.4°C23.4°C | 23.4°C | 23 | 5.1 | 11.712 h |
| March | 33.3°C25.1°C | 25.1°C | 58 | 10.6 | 12.012 h |
| April | 33.8°C26.1°C | 26.1°C | 90 | 14.1 | 12.412 h |
| May | 32.5°C26.2°C | 26.2°C | 145 | 21.2 | 12.713 h |
| June | 31.6°C26.1°C | 26.1°C | 123 | 20.9 | 12.913 h |
| July | 31.0°C25.8°C | 25.8°C | 133 | 22.5 | 12.813 h |
| August | 30.8°C25.6°C | 25.6°C | 136 | 23.3 | 12.613 h |
| September, selected | 30.4°C25.0°C | 25.0°C | 232 | 25.1 | 12.212 h |
| October | 30.2°C24.0°C | 24.0°C | 195 | 21.7 | 11.812 h |
| November | 30.8°C23.2°C | 23.2°C | 43 | 7.1 | 11.512 h |
| December | 30.8°C21.9°C | 21.9°C | 12 | 2.6 | 11.411 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
- Si Racha in SeptemberThailand · 22 kmHigh 30.1°C · Low 25.4°C · 232 mm rain
- Laem Chabang in SeptemberThailand · 32 kmHigh 29.6°C · Low 25.6°C · 242 mm rain
- Lat Krabang in SeptemberThailand · 45 kmHigh 30.8°C · Low 25.0°C · 254 mm rain
- Pattaya in SeptemberThailand · 49 kmHigh 29.8°C · Low 25.7°C · 242 mm rain
- Samut Prakan in SeptemberThailand · 49 kmHigh 30.4°C · Low 25.5°C · 212 mm rain
- Ban Khlong Prawet in SeptemberThailand · 51 kmHigh 30.8°C · Low 25.2°C · 254 mm rain
- Nong Chok in SeptemberThailand · 56 kmHigh 30.9°C · Low 24.6°C · 254 mm rain
- Bueng Kum in SeptemberThailand · 58 kmHigh 30.8°C · Low 24.9°C · 254 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 Chon Buri) is explained once on the Chon Buri year overview and on the Sources, method and limits page.
Si Racha lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.