Climate averages 1991–2020
Rantauprapat weather
in September.
A hot, very wet month: the joint 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Rantauprapat: daytime highs average 30.1°C and nights cool to about 22.9°C. By daytime temperature it is the joint 5th warmest of the 12 months.
Expect about 257 mm of rain on roughly 26 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average September day.
The nearest other city in this atlas is Tanjungbalai (96 km away). In September its highs average 29.5°C, 0.7°C cooler than Rantauprapat, with 282 mm of rain.
Among the 200 cities listed in Indonesia, Rantauprapat ranks joint 101st of 200 for the warmest September highs and joint 185th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Rantauprapat is level with that mean.
From September to October, average highs fall by 0.5°C to 29.6°C, and monthly rainfall rises from 257 mm to 299 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
Rantauprapat climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.8°C22.3°C | 22.3°C | 231 | 27.1 | 12.012 h |
| February | 29.5°C22.5°C | 22.5°C | 184 | 24.0 | 12.012 h |
| March | 30.0°C22.8°C | 22.8°C | 228 | 27.6 | 12.112 h |
| April | 30.1°C23.2°C | 23.2°C | 254 | 28.4 | 12.212 h |
| May | 30.3°C23.4°C | 23.4°C | 212 | 26.5 | 12.212 h |
| June | 30.5°C23.3°C | 23.3°C | 150 | 20.7 | 12.212 h |
| July | 30.7°C22.9°C | 22.9°C | 158 | 21.3 | 12.212 h |
| August | 30.6°C22.9°C | 22.9°C | 193 | 24.5 | 12.212 h |
| September, selected | 30.1°C22.9°C | 22.9°C | 257 | 26.4 | 12.112 h |
| October | 29.6°C22.8°C | 22.8°C | 299 | 28.5 | 12.112 h |
| November | 28.9°C22.6°C | 22.6°C | 344 | 29.2 | 12.012 h |
| December | 28.6°C22.5°C | 22.5°C | 323 | 28.9 | 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
- Tanjungbalai in SeptemberIndonesia · 96 kmHigh 29.5°C · Low 24.2°C · 282 mm rain
- Kisaran in SeptemberIndonesia · 101 kmHigh 29.8°C · Low 23.3°C · 278 mm rain
- Padangsidempuan in SeptemberIndonesia · 102 kmHigh 28.4°C · Low 21.3°C · 236 mm rain
- Sibolga in SeptemberIndonesia · 124 kmHigh 28.8°C · Low 23.0°C · 293 mm rain
- Pematangsiantar in SeptemberIndonesia · 128 kmHigh 27.5°C · Low 20.6°C · 361 mm rain
- Tebingtinggi in SeptemberIndonesia · 156 kmHigh 29.4°C · Low 23.4°C · 238 mm rain
- Dumai in SeptemberIndonesia · 185 kmHigh 30.2°C · Low 23.6°C · 253 mm rain
- Kabanjahe in SeptemberIndonesia · 186 kmHigh 25.0°C · Low 17.2°C · 247 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 Rantauprapat) is explained once on the Rantauprapat year overview and on the Sources, method and limits page.