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Weather & Climate in Íos, Greece
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Íos enjoys a temperate climate with an average annual temperature of 64°F (18°C). Winters average 53°F in January while summers reach 77°F in July. The area gets 303 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 18.2 inches (drier than the 38-inch national average). The city sits at an elevation of 459 feet.
Temperature
53°F Jan (12°C)
77°F Jul (25°C)
| Annual Average | 63.9°F |
| 18% above US avg | |
| January Average | 53°F (12°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 303 days/yr |
Geography
| Elevation | 459 ft (140 m) |
| Area | 0.5 sq mi (1.4 km²) |
| Population Density | 3,748/sq mi |
| Coordinates | 36.7229°N, 25.2817°W |
| Timezone | Europe/Athens |
Precipitation & Snow
Air Quality
Earthquake History
1,252 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.2.
| May 22, 2025 | 66 km SE of Emporeío, Greece | M6.2 | 109 km | 64 km |
| May 23, 1994 | 15 km NNE of Pánormos, Greece | M6.1 | 139 km | 76 km |
| May 21, 2002 | 18 km SW of Adámas, Greece | M5.9 | 91 km | 97 km |
| Aug 29, 2014 | 59 km E of Géfyra, Greece | M5.8 | 141 km | 80 km |
| Apr 4, 2014 | 36 km ESE of Ýdra, Greece | M5.6 | 140 km | 107 km |
| Sep 13, 2003 | 13 km SSW of Kéfalos, Greece | M5.3 | 146 km | 155 km |
| Feb 10, 2025 | 26 km SW of Amorgós, Greece | M5.3 | 33 km | 10 km |
| Feb 4, 2025 | 21 km NE of Firá, Greece | M5.3 | 34 km | 14 km |
| Jan 27, 2012 | 48 km SW of Emporeío, Greece | M5.3 | 78 km | 5 km |
| Jan 26, 2012 | Dodecanese Islands, Greece | M5.2 | 76 km | 29 km |
| Jun 6, 2002 | 49 km N of Sitia, Greece | M5.2 | 144 km | 87 km |
| Mar 20, 1992 | 9 km SE of Adámas, Greece | M5.2 | 68 km | 14 km |
| Feb 9, 2025 | 30 km SW of Amorgós, Greece | M5.2 | 32 km | 10 km |
| Jul 24, 2015 | 14 km WSW of Kéfalos, Greece | M5.1 | 136 km | 141 km |
| Aug 22, 1995 | 27 km SW of Kéfalos, Greece | M5.1 | 128 km | 168 km |
| Feb 10, 2025 | 28 km NE of Firá, Greece | M5.1 | 33 km | 10 km |
| Jul 16, 2010 | 8 km NNW of Kéfalos, Greece | M5.1 | 145 km | 165 km |
| Feb 12, 2025 | 15 km NE of Oía, Greece | M5.1 | 28 km | 10 km |
| Apr 26, 2023 | 13 km SSW of Astyp?laia, Greece | M5.1 | 98 km | 117 km |
| Feb 5, 2025 | 28 km NE of Firá, Greece | M5.1 | 34 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
10 tsunamis recorded within 500 km. Highest wave on record: 90.0 m (295 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| -1610 | THERA ISLAND (SANTORINI) | Astronomical | 90.0 m | — | 37 km |
| 1650 | THERA ISLAND (SANTORINI) | Explosion | 30.0 m | 120 | 37 km |
| 1956 | CYCLADES | Eruption + Earthquake | 20.0 m | 56 | 61 km |
| 1956 | AMORGOS ISLAND, AEGEAN ISLANDS | Earthquake | 10.0 m | — | 21 km |
| 2025 | ISLAND OF CRETE | Earthquake | 0.1 m | — | 114 km |
| 1870 | ALEXANDRIA | Earthquake | — | — | 103 km |
| 1629 | CRETE | Earthquake | — | — | 84 km |
| 1494 | ISLAND OF CRETE | Earthquake | — | — | 137 km |
| 1050 | ISLAND OF THIRA | Astronomical | — | — | 37 km |
| 46 | THERA ISLAND (SANTORINI) | Astronomical | — | — | 37 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Santorini (37 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Santorini | Shield(s) | 367 m (1,204 ft) | 1950 | 37 km |
| Milos | Stratovolcano(es) | 751 m (2,464 ft) | 140 | 75 km |
| Nisyros | Stratovolcano | 698 m (2,290 ft) | 1888 | 168 km |
| Methana | Lava dome(s) | 760 m (2,493 ft) | -258 | 199 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 53°F (12°C) | 3.4 in | Wettest |
| February | 52°F (11°C) | 2.9 in | Coldest |
| March | 55°F (13°C) | 2.4 in | |
| April | 60°F (15°C) | 1.0 in | |
| May | 66°F (19°C) | 0.5 in | |
| June | 74°F (23°C) | 0.2 in | |
| July | 77°F (25°C) | 0.0 in | Warmest, Driest |
| August | 77°F (25°C) | 0.1 in | |
| September | 72°F (22°C) | 0.3 in | |
| October | 67°F (19°C) | 1.8 in | |
| November | 60°F (16°C) | 2.6 in | |
| December | 55°F (13°C) | 3.2 in |
Íos has a seasonal temperature swing of 24°F / from 52°F in February to 77°F in July. Total annual precipitation is 18.2 inches, with January being the wettest month (3.4") and July the driest (0.0").