Climate averages 1991–2020
Khlong Sam Wa weather
in September.
A hot, very wet month: the joint 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 Khlong Sam Wa: daytime highs average 31.0°C and nights cool to about 24.7°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 254 mm of rain on roughly 26 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 Sai Mai (11 km away). In September its highs average 31.0°C, about as warm as Khlong Sam Wa, with 284 mm of rain.
Among the 46 cities listed in Thailand, Khlong Sam Wa ranks joint 8th of 46 for the warmest September highs and joint 29th of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Khlong Sam Wa is 0.6°C warmer than that mean.
From September to October, average highs fall by 0.4°C to 30.6°C, and monthly rainfall falls from 254 mm to 183 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
Khlong Sam Wa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.1°C21.2°C | 21.2°C | 17 | 3.6 | 11.411 h |
| February | 32.4°C22.9°C | 22.9°C | 16 | 3.6 | 11.712 h |
| March | 33.8°C24.9°C | 24.9°C | 49 | 8.4 | 12.012 h |
| April | 34.5°C26.1°C | 26.1°C | 81 | 12.9 | 12.412 h |
| May | 33.2°C26.1°C | 26.1°C | 150 | 22.2 | 12.813 h |
| June | 32.2°C25.8°C | 25.8°C | 141 | 22.9 | 12.913 h |
| July | 31.6°C25.4°C | 25.4°C | 154 | 24.4 | 12.913 h |
| August | 31.3°C25.2°C | 25.2°C | 165 | 25.0 | 12.613 h |
| September, selected | 31.0°C24.7°C | 24.7°C | 254 | 26.2 | 12.212 h |
| October | 30.6°C23.8°C | 23.8°C | 183 | 20.3 | 11.812 h |
| November | 31.0°C22.7°C | 22.7°C | 39 | 6.5 | 11.511 h |
| December | 30.6°C21.2°C | 21.2°C | 9.7 | 1.9 | 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
- Sai Mai in SeptemberThailand · 11 kmHigh 31.0°C · Low 24.7°C · 284 mm rain
- Bueng Kum in SeptemberThailand · 12 kmHigh 30.8°C · Low 24.9°C · 254 mm rain
- Nong Chok in SeptemberThailand · 14 kmHigh 30.9°C · Low 24.6°C · 254 mm rain
- Lat Krabang in SeptemberThailand · 17 kmHigh 30.8°C · Low 25.0°C · 254 mm rain
- Ban Khlong Prawet in SeptemberThailand · 18 kmHigh 30.8°C · Low 25.2°C · 254 mm rain
- Chatuchak in SeptemberThailand · 20 kmHigh 30.8°C · Low 24.9°C · 237 mm rain
- Watthana in SeptemberThailand · 23 kmHigh 30.7°C · Low 25.1°C · 237 mm rain
- Khlong Luang in SeptemberThailand · 24 kmHigh 31.2°C · Low 24.7°C · 284 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 Khlong Sam Wa) is explained once on the Khlong Sam Wa year overview and on the Sources, method and limits page.
Lat Krabang, Ban Khlong Prawet and Nong Chok lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.