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Weather & Climate in Semnan, Iran
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Semnan enjoys a temperate climate with an average annual temperature of 64°F (18°C). Winters average 39°F in January while summers reach 88°F in July. The area gets 320 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 8.9 inches (drier than the 38-inch national average). The city sits at an elevation of 3,766 feet.
Temperature
39°F Jan (4°C)
88°F Jul (31°C)
| Annual Average | 64.1°F |
| 19% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 88°F (31°C) |
| Sunny Days | 320 days/yr |
Geography
| Elevation | 3,766 ft (1,148 m) |
| Area | 26.2 sq mi (67.9 km²) |
| Population Density | 4,764/sq mi |
| Coordinates | 35.5769°N, 53.3921°W |
| Timezone | Asia/Tehran |
Precipitation & Snow
Air Quality
Earthquake History
91 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.
| Jan 20, 1990 | 36 km E of Soleh Bon, Iran | M6.0 | 49 km | 25 km |
| Aug 27, 2010 | 76 km S of D?mgh?n, Iran | M5.8 | 98 km | 7 km |
| Sep 22, 1992 | 24 km S of B?bol, Iran | M5.1 | 105 km | 36 km |
| Jan 11, 2012 | 26 km SSE of B?bol, Iran | M5.1 | 100 km | 16 km |
| Jun 9, 1993 | 90 km S of Semnan, Iran | M5.0 | 91 km | 30 km |
| Aug 28, 2010 | 75 km S of D?mgh?n, Iran | M4.9 | 95 km | 6 km |
| Jun 20, 2025 | 38 km WSW of Semnan, Iran | M4.9 | 39 km | 10 km |
| Dec 9, 1999 | 19 km S of Behshahr, Iran | M4.8 | 105 km | 10 km |
| Mar 21, 2013 | 56 km NE of Mahdishahr, Iran | M4.8 | 68 km | 10 km |
| Jan 9, 1998 | 15 km W of ?mol, Iran | M4.8 | 148 km | 33 km |
| Feb 16, 1990 | 28 km SSE of D?mgh?n, Iran | M4.8 | 99 km | 23 km |
| Nov 3, 1997 | 20 km NNE of D?mgh?n, Iran | M4.8 | 127 km | 33 km |
| Aug 23, 1991 | 23 km NNW of Mahdishahr, Iran | M4.7 | 39 km | 33 km |
| Jul 4, 2019 | 26 km S of D?mgh?n, Iran | M4.7 | 98 km | 10 km |
| Feb 10, 2012 | 23 km SSW of Soleh Bon, Iran | M4.7 | 88 km | 14 km |
| Oct 10, 2002 | 24 km WNW of Soleh Bon, Iran | M4.7 | 102 km | 33 km |
| Jan 20, 2010 | 28 km ENE of Soleh Bon, Iran | M4.7 | 55 km | 5 km |
| Jan 22, 1991 | 25 km SSW of Soleh Bon, Iran | M4.6 | 90 km | 13 km |
| Aug 19, 1993 | 25 km SW of ?stg?h-e R?h ?han-e Garms?r, Iran | M4.6 | 130 km | 18 km |
| May 7, 2020 | 3 km NNW of Dam?vand, Iran | M4.6 | 123 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Nearby Volcanoes
1 volcano within 200 km. Closest: Damavand (123 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Damavand | Stratovolcano | 5,670 m (18,602 ft) | -5350 | 123 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 1.3 in | Coldest |
| February | 43°F (6°C) | 1.1 in | |
| March | 51°F (11°C) | 1.3 in | Wettest |
| April | 64°F (18°C) | 0.8 in | |
| May | 74°F (23°C) | 0.7 in | |
| June | 84°F (29°C) | 0.3 in | |
| July | 88°F (31°C) | 0.2 in | Warmest, Driest |
| August | 86°F (30°C) | 0.2 in | |
| September | 79°F (26°C) | 0.3 in | |
| October | 66°F (19°C) | 0.8 in | |
| November | 53°F (12°C) | 0.9 in | |
| December | 42°F (6°C) | 1.1 in |
Semnan has a seasonal temperature swing of 50°F / from 39°F in January to 88°F in July. Total annual precipitation is 8.9 inches, with March being the wettest month (1.3") and July the driest (0.2").