Climate averages 1991–2020
Sidoarjo weather
in September.
A hot, very dry month: the 2nd warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sidoarjo: daytime highs average 33.3°C and nights cool to about 23.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 11 mm of rain on roughly 3 days, which makes September a very dry month (the 2nd 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 Bangil (20 km away). In September its highs average 33.0°C, about as warm as Sidoarjo, with 11 mm of rain.
Among the 200 cities listed in Indonesia, Sidoarjo ranks 5th of 200 for the warmest September highs and joint 6th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Sidoarjo is 3.2°C warmer than that mean.
From September to October, average highs rise by 0.3°C to 33.6°C, and monthly rainfall rises from 11 mm to 38 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
Sidoarjo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.7°C | 23.7°C | 298 | 28.9 | 12.513 h |
| February | 29.5°C23.6°C | 23.6°C | 280 | 27.3 | 12.312 h |
| March | 29.8°C23.6°C | 23.6°C | 253 | 27.8 | 12.112 h |
| April | 30.1°C23.7°C | 23.7°C | 144 | 21.2 | 11.912 h |
| May | 30.9°C23.6°C | 23.6°C | 49 | 10.1 | 11.812 h |
| June | 30.9°C23.1°C | 23.1°C | 24 | 6.3 | 11.712 h |
| July | 31.2°C22.4°C | 22.4°C | 12 | 3.0 | 11.712 h |
| August | 32.1°C22.4°C | 22.4°C | 3.7 | 1.4 | 11.912 h |
| September, selected | 33.3°C23.1°C | 23.1°C | 11 | 2.7 | 12.112 h |
| October | 33.6°C24.0°C | 24.0°C | 38 | 8.0 | 12.312 h |
| November | 32.1°C24.5°C | 24.5°C | 117 | 18.4 | 12.412 h |
| December | 30.2°C24.0°C | 24.0°C | 253 | 27.5 | 12.513 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
- Bangil in SeptemberIndonesia · 20 kmHigh 33.0°C · Low 22.3°C · 11 mm rain
- Surabaya in SeptemberIndonesia · 22 kmHigh 32.9°C · Low 24.5°C · 20 mm rain
- Pasuruan in SeptemberIndonesia · 30 kmHigh 31.9°C · Low 22.8°C · 10 mm rain
- Mojokerto in SeptemberIndonesia · 31 kmHigh 34.0°C · Low 22.3°C · 31 mm rain
- Kebomas in SeptemberIndonesia · 33 kmHigh 32.5°C · Low 23.5°C · 20 mm rain
- Lawang in SeptemberIndonesia · 43 kmHigh 31.0°C · Low 20.0°C · 21 mm rain
- Bangkalan in SeptemberIndonesia · 45 kmHigh 31.6°C · Low 25.1°C · 20 mm rain
- Singosari in SeptemberIndonesia · 50 kmHigh 30.5°C · Low 20.1°C · 43 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 Sidoarjo) is explained once on the Sidoarjo year overview and on the Sources, method and limits page.
Bangil lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.