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Pematangsiantar Weather by Month
Average temperatures, rainfall and humidity for Pematangsiantar, Indonesia, month by month, built from OpenWeather’s historical records. Use it to see what a typical Pematangsiantar month looks like before you travel — then check the live Pematangsiantar forecast for the days ahead.
Warmest month
June
30°C average high
Coolest month
February
20°C average low
Wettest month
April
203 mm of rain
Driest month
February
83 mm of rain
Average temperature and rainfall in Pematangsiantar by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 27°C | 20°C | 14°C / 33°C | 106 mm | 89% | 5 km/h |
| February | 28°C | 20°C | 12°C / 33°C | 83 mm | 85% | 5 km/h |
| March | 29°C | 21°C | 14°C / 34°C | 177 mm | 85% | 5 km/h |
| April | 29°C | 21°C | 17°C / 34°C | 203 mm | 87% | 5 km/h |
| May | 29°C | 21°C | 17°C / 35°C | 147 mm | 87% | 5 km/h |
| June | 30°C | 21°C | 15°C / 36°C | 92 mm | 81% | 5 km/h |
| July | 30°C | 21°C | 17°C / 35°C | 102 mm | 82% | 5 km/h |
| August | 29°C | 21°C | 16°C / 35°C | 129 mm | 85% | 5 km/h |
| September | 29°C | 21°C | 16°C / 33°C | 140 mm | 87% | 4 km/h |
| October | 28°C | 21°C | 15°C / 35°C | 155 mm | 89% | 4 km/h |
| November | 27°C | 21°C | 17°C / 32°C | 170 mm | 91% | 4 km/h |
| December | 27°C | 21°C | 17°C / 32°C | 134 mm | 90% | 4 km/h |
Best time to visit Pematangsiantar
The most comfortable time to visit Pematangsiantar is generally December to February, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around April, totalling about 1,638 mm a year.
Travellers who prefer heat should aim for June, when highs average 30°C. April is the month to avoid if rain would spoil your plans — it averages 203 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Pematangsiantar forecast for what is happening now.