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Weather & Climate in Pematangsiantar, Indonesia
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Pematangsiantar has a warm climate with an average annual temperature of 76°F (25°C). Winters average 75°F in January while summers reach 76°F in July / relatively mild seasonal variation. The area gets 137 sunny days per year, below the national average of 205. Annual precipitation totals 110.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 1,273 feet.
Temperature
75°F Jan (24°C)
76°F Jul (25°C)
| Annual Average | 76.2°F |
| 41% above US avg | |
| January Average | 75°F (24°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 137 days/yr |
Geography
| Elevation | 1,273 ft (388 m) |
| Area | 30.9 sq mi (80.0 km²) |
| Population Density | 8,900/sq mi |
| Coordinates | 2.9595°N, 99.0687°W |
| Timezone | Asia/Jakarta |
Precipitation & Snow
Air Quality
Earthquake History
296 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.
| Sep 5, 2011 | 68 km WSW of Kabanjahe, Indonesia | M6.7 | 131 km | 91 km |
| Oct 10, 1996 | 62 km WSW of Binjai, Indonesia | M6.3 | 136 km | 33 km |
| Jun 23, 2012 | 66 km W of Kabanjahe, Indonesia | M6.1 | 130 km | 95 km |
| May 19, 2008 | 31 km NNW of Padangsidempuan, Indonesia | M6.0 | 147 km | 10 km |
| Jun 14, 2011 | 38 km ENE of Sibolga, Indonesia | M5.6 | 124 km | 22 km |
| Jan 16, 2017 | 14 km NNW of Berastagi, Indonesia | M5.6 | 78 km | 6 km |
| Mar 29, 2005 | 44 km N of Padangsidempuan, Indonesia | M5.5 | 132 km | 30 km |
| Jun 14, 2011 | 50 km N of Padangsidempuan, Indonesia | M5.5 | 127 km | 17 km |
| Mar 17, 2025 | 41 km ENE of Sibolga, Indonesia | M5.4 | 121 km | 47 km |
| Jul 11, 2017 | 10 km NNE of Parapat, Indonesia | M5.4 | 26 km | 147 km |
| Jul 15, 1995 | 14 km E of Parapat, Indonesia | M5.4 | 32 km | 165 km |
| Mar 15, 2014 | 13 km S of Pematangsiantar, Indonesia | M5.4 | 14 km | 172 km |
| Nov 1, 1993 | 45 km SE of Singkil, Indonesia | M5.3 | 147 km | 84 km |
| Apr 19, 2015 | 26 km NE of Sibolga, Indonesia | M5.3 | 119 km | 123 km |
| Jul 24, 2007 | 23 km E of Singkil, Indonesia | M5.3 | 142 km | 63 km |
| May 19, 2008 | 39 km NNW of Padangsidempuan, Indonesia | M5.3 | 138 km | 10 km |
| Feb 20, 2012 | 30 km SW of Bandar, Indonesia | M5.2 | 135 km | 193 km |
| Jun 26, 2023 | 55 km NW of Sibolga, Indonesia | M5.2 | 112 km | 91 km |
| Mar 28, 2005 | 18 km NNW of Ambarita, Indonesia | M5.2 | 37 km | 30 km |
| Aug 27, 2012 | 33 km SSE of Parapat, Indonesia | M5.2 | 65 km | 150 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1892 | NORTHEAST SUMATRA | Earthquake | — | — | 70 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Toba (50 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Toba | Caldera | 2,157 m (7,077 ft) | Unknown | 50 km |
| Singkut | Caldera(s) | 2,181 m (7,156 ft) | 1881 | 71 km |
| Sinabung | Stratovolcano | 2,460 m (8,071 ft) | 2019 | 79 km |
| Sibualbuali | Stratovolcano | 1,819 m (5,968 ft) | Unknown | 157 km |
| Lubukraya | Stratovolcano | 1,862 m (6,109 ft) | Unknown | 166 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 75°F (24°C) | 8.0 in | |
| February | 76°F (25°C) | 6.8 in | Driest |
| March | 77°F (25°C) | 8.3 in | |
| April | 77°F (25°C) | 9.3 in | |
| May | 77°F (25°C) | 9.8 in | Warmest |
| June | 77°F (25°C) | 7.0 in | |
| July | 76°F (25°C) | 6.9 in | |
| August | 76°F (25°C) | 8.5 in | |
| September | 76°F (24°C) | 11.9 in | |
| October | 76°F (24°C) | 13.4 in | Wettest |
| November | 76°F (24°C) | 10.4 in | |
| December | 75°F (24°C) | 9.9 in | Coldest |
Pematangsiantar has a seasonal temperature swing of 2°F / from 75°F in December to 77°F in May. Total annual precipitation is 110.2 inches, with October being the wettest month (13.4") and February the driest (6.8").