Climate averages 1991–2020
Pematangsiantar weather
in August.
A warm, very wet month: the joint 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Pematangsiantar: daytime highs average 27.9°C and nights cool to about 20.7°C. By daytime temperature it is the joint 4th warmest of the 12 months.
Expect about 274 mm of rain on roughly 29 days, which makes August a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average August day.
The nearest other city in this atlas is Tebingtinggi (42 km away). In August its highs average 29.9°C, 1.9°C warmer than Pematangsiantar, with 163 mm of rain.
Among the 200 cities listed in Indonesia, Pematangsiantar ranks joint 164th of 200 for the warmest August highs and 195th of 200 for the driest August (rainfall, lowest first). The mean August high of those 200 cities is 29.5°C; Pematangsiantar is 1.6°C cooler than that mean.
From August to September, average highs fall by 0.4°C to 27.5°C, and monthly rainfall rises from 274 mm to 361 mm.
The annual picture
August 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
Pematangsiantar climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.6°C20.2°C | 20.2°C | 240 | 27.9 | 12.012 h |
| February | 27.1°C20.2°C | 20.2°C | 190 | 24.3 | 12.012 h |
| March | 27.8°C20.7°C | 20.7°C | 217 | 26.4 | 12.112 h |
| April | 27.9°C21.0°C | 21.0°C | 249 | 28.6 | 12.212 h |
| May | 28.2°C21.3°C | 21.3°C | 265 | 29.2 | 12.312 h |
| June | 28.3°C21.1°C | 21.1°C | 231 | 27.1 | 12.312 h |
| July | 28.1°C20.8°C | 20.8°C | 236 | 26.7 | 12.312 h |
| August, selected | 27.9°C20.7°C | 20.7°C | 274 | 28.7 | 12.212 h |
| September | 27.5°C20.6°C | 20.6°C | 361 | 29.4 | 12.112 h |
| October | 27.1°C20.6°C | 20.6°C | 375 | 30.2 | 12.112 h |
| November | 26.6°C20.6°C | 20.6°C | 351 | 29.4 | 12.012 h |
| December | 26.3°C20.5°C | 20.5°C | 315 | 29.6 | 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
August in nearby cities
- Tebingtinggi in AugustIndonesia · 42 kmHigh 29.9°C · Low 23.6°C · 163 mm rain
- Kisaran in AugustIndonesia · 61 kmHigh 30.1°C · Low 23.5°C · 202 mm rain
- Kabanjahe in AugustIndonesia · 66 kmHigh 25.1°C · Low 17.3°C · 218 mm rain
- Perbaungan in AugustIndonesia · 69 kmHigh 29.8°C · Low 24.1°C · 147 mm rain
- Percut in AugustIndonesia · 77 kmHigh 29.8°C · Low 23.4°C · 252 mm rain
- Tanjungbalai in AugustIndonesia · 81 kmHigh 29.7°C · Low 24.5°C · 216 mm rain
- Medan in AugustIndonesia · 82 kmHigh 29.9°C · Low 22.6°C · 249 mm rain
- Sunggal in AugustIndonesia · 85 kmHigh 30.1°C · Low 22.3°C · 213 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 Pematangsiantar) is explained once on the Pematangsiantar year overview and on the Sources, method and limits page.