Climate averages 1991–2020
Pematangsiantar weather
in January.
A warm, very wet month: the joint 10th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a warm month in Pematangsiantar: daytime highs average 26.6°C and nights cool to about 20.2°C. By daytime temperature it is the joint 10th warmest of the 12 months.
Expect about 240 mm of rain on roughly 28 days, which makes January a very wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 58 min on an average January day.
The nearest other city in this atlas is Tebingtinggi (42 km away). In January its highs average 28.5°C, 1.9°C warmer than Pematangsiantar, with 170 mm of rain.
Among the 200 cities listed in Indonesia, Pematangsiantar ranks joint 181st of 200 for the warmest January highs and joint 31st of 200 for the driest January (rainfall, lowest first). The mean January high of those 200 cities is 28.2°C; Pematangsiantar is 1.7°C cooler than that mean.
From January to February, average highs rise by 0.6°C to 27.1°C, and monthly rainfall falls from 240 mm to 190 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Tebingtinggi in JanuaryIndonesia · 42 kmHigh 28.5°C · Low 22.9°C · 170 mm rain
- Kisaran in JanuaryIndonesia · 61 kmHigh 28.8°C · Low 22.8°C · 208 mm rain
- Kabanjahe in JanuaryIndonesia · 66 kmHigh 24.0°C · Low 17.3°C · 189 mm rain
- Perbaungan in JanuaryIndonesia · 69 kmHigh 28.4°C · Low 23.4°C · 202 mm rain
- Percut in JanuaryIndonesia · 77 kmHigh 28.5°C · Low 22.8°C · 213 mm rain
- Tanjungbalai in JanuaryIndonesia · 81 kmHigh 28.7°C · Low 23.8°C · 215 mm rain
- Medan in JanuaryIndonesia · 82 kmHigh 28.7°C · Low 22.1°C · 203 mm rain
- Sunggal in JanuaryIndonesia · 85 kmHigh 28.5°C · Low 21.8°C · 237 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.