Climate averages 1991–2020
Sewon weather
in September.
A hot, fairly dry month: the 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sewon: daytime highs average 29.5°C and nights cool to about 22.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 36 mm of rain on roughly 8 days, which makes September a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 03 min on an average September day.
The nearest other city in this atlas is Kasihan (6 km away). In September its highs average 28.8°C, 0.7°C cooler than Sewon, with 66 mm of rain.
Among the 200 cities listed in Indonesia, Sewon ranks joint 125th of 200 for the warmest September highs and 42nd of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Sewon is 0.6°C cooler than that mean.
From September to October, average highs rise by 0.2°C to 29.7°C, and monthly rainfall rises from 36 mm to 121 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
Sewon climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C23.6°C | 23.6°C | 283 | 28.0 | 12.513 h |
| February | 28.6°C23.6°C | 23.6°C | 233 | 24.6 | 12.412 h |
| March | 28.9°C23.6°C | 23.6°C | 211 | 26.5 | 12.212 h |
| April | 29.2°C23.7°C | 23.7°C | 161 | 23.0 | 11.912 h |
| May | 29.4°C23.4°C | 23.4°C | 82 | 14.5 | 11.812 h |
| June | 29.3°C22.7°C | 22.7°C | 62 | 9.8 | 11.712 h |
| July | 28.9°C21.9°C | 21.9°C | 29 | 5.9 | 11.712 h |
| August | 29.0°C21.6°C | 21.6°C | 18 | 3.6 | 11.912 h |
| September, selected | 29.5°C22.3°C | 22.3°C | 36 | 7.9 | 12.112 h |
| October | 29.7°C23.2°C | 23.2°C | 121 | 17.1 | 12.312 h |
| November | 29.0°C23.8°C | 23.8°C | 242 | 25.2 | 12.512 h |
| December | 28.3°C23.7°C | 23.7°C | 339 | 27.6 | 12.613 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
- Kasihan in SeptemberIndonesia · 6 kmHigh 28.8°C · Low 21.4°C · 66 mm rain
- Yogyakarta in SeptemberIndonesia · 8 kmHigh 29.7°C · Low 21.4°C · 66 mm rain
- Wonosari in SeptemberIndonesia · 29 kmHigh 29.5°C · Low 22.0°C · 25 mm rain
- Klaten in SeptemberIndonesia · 33 kmHigh 31.0°C · Low 20.9°C · 41 mm rain
- Muntilan in SeptemberIndonesia · 34 kmHigh 28.5°C · Low 20.1°C · 102 mm rain
- Magelang in SeptemberIndonesia · 48 kmHigh 28.0°C · Low 19.7°C · 102 mm rain
- Kartasura in SeptemberIndonesia · 55 kmHigh 31.5°C · Low 21.5°C · 40 mm rain
- Salatiga in SeptemberIndonesia · 62 kmHigh 30.1°C · Low 20.5°C · 53 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 Sewon) is explained once on the Sewon year overview and on the Sources, method and limits page.