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Weather & Climate in Siena, Italy
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siena enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 42°F in January while summers reach 77°F in July. The area gets 289 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 38.7 inches. The area receives 5.5 inches of snow annually. The city sits at an elevation of 1,056 feet.
Temperature
42°F Jan (5°C)
77°F Jul (25°C)
| Annual Average | 57.8°F |
| 7% above US avg | |
| January Average | 42°F (5°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 289 days/yr |
Geography
| Elevation | 1,056 ft (322 m) |
| Area | 52.3 sq mi (135.5 km²) |
| Population Density | 1,030/sq mi |
| Coordinates | 43.3182°N, 11.3306°W |
| Timezone | Europe/Rome |
Precipitation & Snow
Air Quality
Earthquake History
2,045 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.
| Sep 26, 1997 | 3 km SSE of Nocera Umbra, Italy | M6.0 | 123 km | 10 km |
| Sep 26, 1997 | 6 km WSW of Serravalle di Chienti, Italy | M5.7 | 129 km | 10 km |
| Oct 14, 1997 | 8 km NNW of Sellano, Italy | M5.5 | 133 km | 10 km |
| Oct 6, 1997 | 6 km E of Valtopina, Italy | M5.5 | 126 km | 10 km |
| Mar 26, 1998 | 1 km E of Esanatoglia, Italy | M5.4 | 133 km | 10 km |
| Oct 3, 1997 | 3 km ENE of Valtopina, Italy | M5.3 | 122 km | 10 km |
| Oct 12, 1997 | 2 km NW of Sellano, Italy | M5.3 | 135 km | 10 km |
| Sep 14, 2003 | 3 km E of Monterenzio, Italy | M5.3 | 113 km | 10 km |
| Jun 21, 2013 | 6 km WSW of Minucciano, Italy | M5.2 | 134 km | 5 km |
| Apr 3, 1998 | 8 km E of Valfabbrica, Italy | M5.2 | 112 km | 10 km |
| May 10, 2000 | 7 km SE of Granarolo, Italy | M5.1 | 123 km | 10 km |
| Sep 18, 2023 | 7 km SE of Marradi, Italy | M5.1 | 83 km | 10 km |
| Jun 30, 2013 | 6 km SW of Minucciano, Italy | M4.9 | 131 km | 10 km |
| Jun 5, 1993 | 7 km ESE of Valfabbrica, Italy | M4.9 | 111 km | 8 km |
| Jan 25, 2013 | 3 km ENE of Castiglione di Garfagnana, Italy | M4.9 | 118 km | 16 km |
| May 8, 2000 | 3 km NE of Faenza, Italy | M4.8 | 120 km | 10 km |
| Oct 16, 1997 | 8 km ESE of Valtopina, Italy | M4.8 | 127 km | 10 km |
| Jun 22, 2000 | 8 km WSW of Cipolleto, Italy | M4.8 | 93 km | 10 km |
| Nov 9, 1997 | 2 km NE of Sellano, Italy | M4.8 | 139 km | 10 km |
| Mar 1, 2008 | 6 km NNW of Galliano, Italy | M4.8 | 83 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
7 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1875 | ADRIATIC SEA | Earthquake | - | - | 130 km |
| 1846 | LIVORNO | Earthquake | - | 56 | 60 km |
| 1846 | TUSCANY | Earthquake | - | - | 70 km |
| 1742 | LIVORNO | Earthquake | - | - | 94 km |
| 1672 | CENTRAL ADRIATIC | Earthquake | - | 1,500 | 122 km |
| 1646 | LIVORNO | Earthquake | - | - | 86 km |
| 1624 | DELTA OF THE PO | Earthquake | - | - | 147 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Vulsini (94 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Vulsini | Caldera | 800 m (2,625 ft) | -104 | 94 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 2.3 in | Coldest |
| February | 44°F (7°C) | 2.3 in | |
| March | 48°F (9°C) | 2.3 in | |
| April | 53°F (12°C) | 2.6 in | |
| May | 61°F (16°C) | 2.2 in | |
| June | 67°F (20°C) | 1.7 in | |
| July | 77°F (25°C) | 1.1 in | Warmest, Driest |
| August | 72°F (22°C) | 1.6 in | |
| September | 66°F (19°C) | 2.6 in | |
| October | 59°F (15°C) | 3.2 in | |
| November | 50°F (10°C) | 3.7 in | Wettest |
| December | 44°F (6°C) | 2.8 in |
Siena has a seasonal temperature swing of 35°F / from 42°F in January to 77°F in July. Total annual precipitation is 28.5 inches, with November being the wettest month (3.7") and July the driest (1.1").