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Weather & Climate in Ilām, Nepal
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ilām enjoys a temperate climate with an average annual temperature of 69°F (21°C). Winters average 57°F in January while summers reach 76°F in July / relatively mild seasonal variation. The area gets 212 sunny days per year. Annual precipitation totals 85.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 3,996 feet.
Temperature
57°F Jan (14°C)
76°F Jul (25°C)
| Annual Average | 69.2°F |
| 28% above US avg | |
| January Average | 57°F (14°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 212 days/yr |
Geography
| Elevation | 3,996 ft (1,218 m) |
| Area | 116.3 sq mi (301.2 km²) |
| Population Density | 150/sq mi |
| Coordinates | 26.9094°N, 87.9282°W |
| Timezone | Asia/Kathmandu |
Precipitation & Snow
Air Quality
Earthquake History
113 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Sep 18, 2011 | 43 km NW of Mangan, India | M6.9 | 94 km | 50 km |
| Sep 3, 1998 | 16 km SE of Lobujya, Nepal | M5.6 | 143 km | 33 km |
| Jan 9, 1990 | 86 km NNW of Mangan, India | M5.5 | 148 km | 79 km |
| Mar 25, 2003 | 14 km SSE of Ha, Bhutan | M5.5 | 144 km | 47 km |
| Feb 14, 2006 | 16 km NE of Gyalshing, India | M5.3 | 70 km | 30 km |
| Oct 3, 2013 | 11 km WNW of Singtam, India | M5.2 | 63 km | 10 km |
| Apr 5, 2021 | 35 km NNW of Samtse, Bhutan | M5.2 | 105 km | 10 km |
| Dec 2, 2001 | 7 km WNW of Naya B?z?r, India | M5.1 | 36 km | 33 km |
| Apr 27, 2015 | 13 km ESE of Il?m, Nepal | M5.1 | 14 km | 32 km |
| Nov 27, 1997 | 30 km NNE of Kh??db?ri??, Nepal | M5.1 | 98 km | 33 km |
| Nov 26, 1998 | 62 km NW of Gyalshing, India | M5.1 | 94 km | 73 km |
| Jul 31, 2022 | 26 km W of Bhojpur, Nepal | M5.1 | 116 km | 10 km |
| Feb 15, 1993 | 6 km W of Kasba, India | M5.0 | 126 km | 30 km |
| Sep 25, 1996 | 8 km SSE of Mangan, India | M5.0 | 85 km | 33 km |
| Aug 11, 2007 | 51 km NNW of Il?m, Nepal | M5.0 | 52 km | 35 km |
| Mar 27, 2012 | 17 km W of Kishanganj, India | M5.0 | 93 km | 29 km |
| Jun 3, 2011 | 35 km NW of Gyalshing, India | M5.0 | 70 km | 46 km |
| Dec 30, 1996 | 41 km S of Namche Bazar, Nepal | M5.0 | 140 km | 33 km |
| Dec 8, 1997 | 11 km NNW of Kh??db?ri??, Nepal | M5.0 | 98 km | 33 km |
| Apr 26, 1996 | 73 km NW of Gyalshing, India | M5.0 | 102 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 15.0 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2023 | SOUTH LHONAK LAK, SIKKIM | Meteorological | 15.0 m | 55 | 122 km |
| 1934 | BIHAR-NEPAL, GANGES RIVER | Earthquake | — | 10,600 | 117 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 57°F (14°C) | 0.6 in | Coldest |
| February | 60°F (15°C) | 0.6 in | |
| March | 68°F (20°C) | 1.5 in | |
| April | 73°F (23°C) | 3.2 in | |
| May | 75°F (24°C) | 7.3 in | |
| June | 77°F (25°C) | 15.9 in | Warmest |
| July | 76°F (25°C) | 22.3 in | Wettest |
| August | 77°F (25°C) | 16.5 in | |
| September | 75°F (24°C) | 12.6 in | |
| October | 72°F (22°C) | 4.0 in | |
| November | 65°F (18°C) | 0.6 in | |
| December | 59°F (15°C) | 0.2 in | Driest |
Ilām has a seasonal temperature swing of 20°F / from 57°F in January to 77°F in June. Total annual precipitation is 85.2 inches, with July being the wettest month (22.3") and December the driest (0.2").