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Weather & Climate in Porto Ercole, Italy
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Porto Ercole enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 46°F in January while summers reach 74°F in July. The area gets 298 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 21.0 inches (drier than the 38-inch national average). The city sits at an elevation of 10 feet.
Temperature
46°F Jan (8°C)
74°F Jul (23°C)
| Annual Average | 59.0°F |
| 9% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 298 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 113.3 sq mi (293.4 km²) |
| Population Density | 24/sq mi |
| Coordinates | 42.4017°N, 11.2052°W |
| Timezone | Europe/Rome |
Precipitation & Snow
Air Quality
Earthquake History
618 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Oct 3, 1997 | 3 km ENE of Valtopina, Italy | M5.3 | 150 km | 10 km |
| Oct 12, 1997 | 2 km NW of Sellano, Italy | M5.3 | 149 km | 10 km |
| Apr 3, 1998 | 8 km E of Valfabbrica, Italy | M5.2 | 149 km | 10 km |
| Jun 5, 1993 | 7 km ESE of Valfabbrica, Italy | M4.9 | 144 km | 8 km |
| Jun 22, 2000 | 8 km WSW of Cipolleto, Italy | M4.8 | 144 km | 10 km |
| Aug 15, 1998 | 3 km NE of Cittaducale, Italy | M4.8 | 146 km | 10 km |
| Sep 3, 1997 | 6 km ESE of Valtopina, Italy | M4.7 | 150 km | 10 km |
| Oct 4, 1997 | 7 km NW of Sellano, Italy | M4.6 | 147 km | 10 km |
| Nov 7, 2001 | 56 km ENE of Porto Cervo, Italy | M4.6 | 147 km | 10 km |
| Sep 27, 1997 | 7 km ESE of Valtopina, Italy | M4.5 | 150 km | 10 km |
| Mar 9, 2023 | 2 km S of Umbertide, Italy | M4.5 | 135 km | 10 km |
| Mar 21, 1998 | 10 km NW of Sellano, Italy | M4.5 | 146 km | 10 km |
| Oct 4, 1997 | 2 km NW of Sellano, Italy | M4.5 | 149 km | 10 km |
| Oct 19, 1997 | 8 km ENE of Foligno, Italy | M4.5 | 145 km | 10 km |
| Apr 1, 2000 | 1 km SSW of Piancastagnaio, Italy | M4.5 | 63 km | 10 km |
| Oct 15, 1997 | 5 km NNW of Sellano, Italy | M4.5 | 150 km | 10 km |
| Sep 27, 1997 | 1 km ENE of Valtopina, Italy | M4.5 | 147 km | 10 km |
| Nov 6, 1997 | 0 km S of Rocca Priora, Italy | M4.5 | 147 km | 10 km |
| Oct 17, 1997 | central Italy | M4.5 | 150 km | 10 km |
| Jun 11, 2000 | 1 km NW of Costano, Italy | M4.4 | 130 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
4 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1846 | LIVORNO | Earthquake | - | 56 | 122 km |
| 1846 | TUSCANY | Earthquake | - | - | 135 km |
| 1742 | LIVORNO | Earthquake | - | - | 147 km |
| 1646 | LIVORNO | Earthquake | - | - | 147 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Vulsini (63 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Vulsini | Caldera | 800 m (2,625 ft) | -104 | 63 km |
| Colli Albani | Caldera | 949 m (3,114 ft) | Unknown | 144 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 46°F (8°C) | 2.2 in | Coldest |
| February | 47°F (8°C) | 1.9 in | |
| March | 50°F (10°C) | 1.8 in | |
| April | 54°F (12°C) | 1.6 in | |
| May | 62°F (17°C) | 1.4 in | |
| June | 69°F (20°C) | 0.8 in | |
| July | 74°F (23°C) | 0.4 in | Driest |
| August | 75°F (24°C) | 1.1 in | Warmest |
| September | 69°F (21°C) | 2.2 in | |
| October | 62°F (16°C) | 2.7 in | |
| November | 53°F (12°C) | 2.9 in | Wettest |
| December | 48°F (9°C) | 2.2 in |
Porto Ercole has a seasonal temperature swing of 29°F / from 46°F in January to 75°F in August. Total annual precipitation is 21.0 inches, with November being the wettest month (2.9") and July the driest (0.4").