Climate averages 1991–2020
Sibolga weather
in September.
A hot, very wet month: the 9th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sibolga: daytime highs average 28.8°C and nights cool to about 23.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 293 mm of rain on roughly 23 days, which makes September a very wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 07 min on an average September day.
The nearest other city in this atlas is Padangsidempuan (68 km away). In September its highs average 28.4°C, about as warm as Sibolga, with 236 mm of rain.
Among the 200 cities listed in Indonesia, Sibolga ranks joint 149th of 200 for the warmest September highs and 189th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Sibolga is 1.3°C cooler than that mean.
From September to October, average highs fall by 0.3°C to 28.5°C, and monthly rainfall rises from 293 mm to 427 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
Sibolga climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.3°C22.9°C | 22.9°C | 338 | 26.7 | 12.012 h |
| February | 29.7°C23.0°C | 23.0°C | 313 | 23.9 | 12.112 h |
| March | 29.6°C23.1°C | 23.1°C | 361 | 27.4 | 12.112 h |
| April | 29.4°C23.4°C | 23.4°C | 357 | 26.7 | 12.212 h |
| May | 29.7°C23.8°C | 23.8°C | 260 | 21.6 | 12.212 h |
| June | 29.6°C23.6°C | 23.6°C | 159 | 17.3 | 12.212 h |
| July | 29.1°C23.2°C | 23.2°C | 193 | 19.1 | 12.212 h |
| August | 28.9°C23.0°C | 23.0°C | 284 | 22.8 | 12.212 h |
| September, selected | 28.8°C23.0°C | 23.0°C | 293 | 23.2 | 12.112 h |
| October | 28.5°C22.8°C | 22.8°C | 427 | 26.1 | 12.112 h |
| November | 28.3°C22.7°C | 22.7°C | 507 | 27.6 | 12.012 h |
| December | 28.6°C22.8°C | 22.8°C | 433 | 27.6 | 12.012 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
- Padangsidempuan in SeptemberIndonesia · 68 kmHigh 28.4°C · Low 21.3°C · 236 mm rain
- Rantauprapat in SeptemberIndonesia · 124 kmHigh 30.1°C · Low 22.9°C · 257 mm rain
- Gunungsitoli in SeptemberIndonesia · 139 kmHigh 28.7°C · Low 24.1°C · 352 mm rain
- Pematangsiantar in SeptemberIndonesia · 139 kmHigh 27.5°C · Low 20.6°C · 361 mm rain
- Subulussalam in SeptemberIndonesia · 143 kmHigh 29.1°C · Low 21.4°C · 295 mm rain
- Kabanjahe in SeptemberIndonesia · 155 kmHigh 25.0°C · Low 17.2°C · 247 mm rain
- Kisaran in SeptemberIndonesia · 167 kmHigh 29.8°C · Low 23.3°C · 278 mm rain
- Tanjungbalai in SeptemberIndonesia · 177 kmHigh 29.5°C · Low 24.2°C · 282 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 Sibolga) is explained once on the Sibolga year overview and on the Sources, method and limits page.