Climate averages 1991–2020
Gunungsitoli weather
in September.
A hot, very wet month: the 8th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Gunungsitoli: daytime highs average 28.7°C and nights cool to about 24.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 352 mm of rain on roughly 27 days, which makes September a very wet month (the 8th 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 Sibolga (139 km away). In September its highs average 28.8°C, about as warm as Gunungsitoli, with 293 mm of rain.
Among the 200 cities listed in Indonesia, Gunungsitoli ranks joint 155th of 200 for the warmest September highs and 195th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Gunungsitoli is 1.4°C cooler than that mean.
From September to October, average highs fall by 0.3°C to 28.3°C, and monthly rainfall rises from 352 mm to 471 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
Gunungsitoli climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C24.2°C | 24.2°C | 284 | 26.1 | 12.112 h |
| February | 29.3°C24.4°C | 24.4°C | 237 | 23.2 | 12.112 h |
| March | 29.4°C24.5°C | 24.5°C | 312 | 28.3 | 12.112 h |
| April | 29.2°C24.6°C | 24.6°C | 360 | 28.2 | 12.112 h |
| May | 29.4°C24.9°C | 24.9°C | 285 | 25.3 | 12.212 h |
| June | 29.3°C24.8°C | 24.8°C | 233 | 22.3 | 12.212 h |
| July | 28.9°C24.4°C | 24.4°C | 268 | 24.4 | 12.212 h |
| August | 28.6°C24.2°C | 24.2°C | 332 | 27.0 | 12.212 h |
| September, selected | 28.7°C24.1°C | 24.1°C | 352 | 27.3 | 12.112 h |
| October | 28.3°C24.0°C | 24.0°C | 471 | 28.8 | 12.112 h |
| November | 28.0°C23.9°C | 23.9°C | 511 | 28.6 | 12.112 h |
| December | 28.4°C24.0°C | 24.0°C | 399 | 28.4 | 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
- Sibolga in SeptemberIndonesia · 139 kmHigh 28.8°C · Low 23.0°C · 293 mm rain
- Subulussalam in SeptemberIndonesia · 156 kmHigh 29.1°C · Low 21.4°C · 295 mm rain
- Padangsidempuan in SeptemberIndonesia · 184 kmHigh 28.4°C · Low 21.3°C · 236 mm rain
- Kabanjahe in SeptemberIndonesia · 224 kmHigh 25.0°C · Low 17.2°C · 247 mm rain
- Pematangsiantar in SeptemberIndonesia · 246 kmHigh 27.5°C · Low 20.6°C · 361 mm rain
- Rantauprapat in SeptemberIndonesia · 263 kmHigh 30.1°C · Low 22.9°C · 257 mm rain
- Binjai in SeptemberIndonesia · 275 kmHigh 29.7°C · Low 21.9°C · 306 mm rain
- Sunggal in SeptemberIndonesia · 278 kmHigh 29.6°C · Low 22.2°C · 306 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 Gunungsitoli) is explained once on the Gunungsitoli year overview and on the Sources, method and limits page.