Climate averages 1991–2020
Semarang weather
in September.
A hot, moderately wet month: the 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 Semarang: daytime highs average 31.7°C and nights cool to about 23.6°C. By daytime temperature it is the warmest month of the year.
Expect about 44 mm of rain on roughly 6 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 04 min on an average September day.
The nearest other city in this atlas is Ungaran (16 km away). In September its highs average 30.6°C, 1.1°C cooler than Semarang, with 53 mm of rain.
Among the 200 cities listed in Indonesia, Semarang ranks joint 44th of 200 for the warmest September highs and joint 62nd of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Semarang is 1.6°C warmer than that mean.
From September to October, average highs fall by 0.4°C to 31.3°C, and monthly rainfall rises from 44 mm to 139 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
Semarang climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.7°C23.5°C | 23.5°C | 391 | 29.9 | 12.512 h |
| February | 27.7°C23.5°C | 23.5°C | 356 | 27.4 | 12.312 h |
| March | 28.4°C23.4°C | 23.4°C | 345 | 29.3 | 12.112 h |
| April | 29.1°C23.4°C | 23.4°C | 237 | 25.9 | 12.012 h |
| May | 29.6°C23.3°C | 23.3°C | 102 | 16.4 | 11.812 h |
| June | 29.9°C23.0°C | 23.0°C | 60 | 10.4 | 11.712 h |
| July | 30.4°C22.7°C | 22.7°C | 38 | 6.5 | 11.812 h |
| August | 31.1°C22.8°C | 22.8°C | 23 | 3.9 | 11.912 h |
| September, selected | 31.7°C23.6°C | 23.6°C | 44 | 6.1 | 12.112 h |
| October | 31.3°C24.1°C | 24.1°C | 139 | 15.3 | 12.312 h |
| November | 29.7°C23.9°C | 23.9°C | 282 | 25.6 | 12.412 h |
| December | 28.4°C23.5°C | 23.5°C | 416 | 29.2 | 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
- Ungaran in SeptemberIndonesia · 16 kmHigh 30.6°C · Low 21.7°C · 53 mm rain
- Salatiga in SeptemberIndonesia · 39 kmHigh 30.1°C · Low 20.5°C · 53 mm rain
- Kudus in SeptemberIndonesia · 51 kmHigh 33.9°C · Low 23.4°C · 40 mm rain
- Jepara in SeptemberIndonesia · 52 kmHigh 32.0°C · Low 24.7°C · 32 mm rain
- Purwodadi in SeptemberIndonesia · 56 kmHigh 33.8°C · Low 23.0°C · 35 mm rain
- Magelang in SeptemberIndonesia · 58 kmHigh 28.0°C · Low 19.7°C · 102 mm rain
- Batang in SeptemberIndonesia · 65 kmHigh 31.4°C · Low 25.1°C · 32 mm rain
- Muntilan in SeptemberIndonesia · 67 kmHigh 28.5°C · Low 20.1°C · 102 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 Semarang) is explained once on the Semarang year overview and on the Sources, method and limits page.