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Weather & Climate in İznik, Turkey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
İznik experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 39°F in January while summers reach 72°F in July. The area gets 295 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 22.8 inches (drier than the 38-inch national average). The city sits at an elevation of 325 feet.
Temperature
39°F Jan (4°C)
72°F Jul (22°C)
| Annual Average | 55.2°F |
| 2% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 295 days/yr |
Geography
| Elevation | 325 ft (99 m) |
| Area | 290.7 sq mi (753.0 km²) |
| Population Density | 76/sq mi |
| Coordinates | 40.4286°N, 29.7211°W |
| Timezone | Europe/Istanbul |
Precipitation & Snow
Air Quality
Earthquake History
3,965 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.6.
| Aug 17, 1999 | 4 km ESE of Derince, Turkey | M7.6 | 38 km | 17 km |
| Nov 12, 1999 | 8 km S of Düzce, Turkey | M7.2 | 127 km | 10 km |
| Apr 23, 2025 | 24 km SE of Marmara Ereğlisi, Turkey | M6.2 | 137 km | 13 km |
| Sep 13, 1999 | 4 km SE of Köseköy, Turkey | M5.9 | 42 km | 13 km |
| Sep 26, 2019 | 17 km ESE of Marmara Ere?lisi, Turkey | M5.7 | 143 km | 8 km |
| Nov 11, 1999 | 5 km N of Sapanca, Turkey | M5.7 | 58 km | 22 km |
| Nov 12, 1999 | 7 km SSW of Düzce, Turkey | M5.5 | 125 km | 10 km |
| Aug 23, 2000 | 8 km E of Akyaz?, Turkey | M5.3 | 89 km | 15 km |
| Sep 29, 1999 | 8 km NNW of Ta?köprü, Turkey | M5.2 | 47 km | 10 km |
| Aug 19, 1999 | 3 km SSE of Ç?narc?k, Turkey | M5.2 | 54 km | 10 km |
| Aug 31, 1999 | 2 km NNE of Kar??yaka, Turkey | M5.2 | 37 km | 10 km |
| May 3, 2012 | 13 km NE of Simav, Turkey | M5.2 | 149 km | 3 km |
| Aug 17, 1999 | 9 km SE of Akyaz?, Turkey | M5.1 | 84 km | 10 km |
| Apr 23, 2025 | 14 km S of Kumburgaz, Turkey | M5.0 | 116 km | 10 km |
| Sep 9, 1999 | 7 km NNW of Koruköy, Turkey | M5.0 | 58 km | 13 km |
| Nov 7, 1999 | 8 km E of Akyaz?, Turkey | M5.0 | 90 km | 10 km |
| Aug 17, 1999 | 2 km NW of Kullar, Turkey | M5.0 | 41 km | 10 km |
| Aug 17, 1999 | 9 km ESE of Köseköy, Turkey | M4.9 | 46 km | 10 km |
| Jan 11, 2020 | 16 km S of Silivri, Turkey | M4.9 | 137 km | 10 km |
| Sep 24, 2019 | 20 km SE of Marmara Ere?lisi, Turkey | M4.9 | 141 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
9 tsunamis recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1509 | MARMARA SEA | Earthquake | 6.0 m | 5,000 | 143 km |
| 1894 | MARMARA SEA | Earthquake | 4.5 m | 1,349 | 88 km |
| 1999 | KOCAELI, TURKEY | Earthquake | 2.5 m | 17,118 | 42 km |
| 1963 | MARMARA SEA | Earthquake | 1.0 m | 1 | 56 km |
| 2025 | MARMARA SEA | Earthquake | 0.1 m | - | 141 km |
| 1343 | MARMARA SEA, STRAIT OF BOSPORUS | Earthquake | - | - | 127 km |
| 986 | MARMARA SEA | Earthquake | - | - | 60 km |
| 551 | LEVANTIAN SEA | Earthquake | - | - | 44 km |
| 478 | MARMARA SEA | Earthquake | - | - | 60 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 2.8 in | Coldest, Wettest |
| February | 40°F (5°C) | 2.2 in | |
| March | 44°F (7°C) | 2.1 in | |
| April | 53°F (12°C) | 1.9 in | |
| May | 61°F (16°C) | 1.8 in | |
| June | 68°F (20°C) | 1.4 in | |
| July | 72°F (22°C) | 1.0 in | Warmest |
| August | 72°F (22°C) | 0.9 in | Driest |
| September | 66°F (19°C) | 1.4 in | |
| October | 58°F (14°C) | 2.2 in | |
| November | 49°F (10°C) | 2.4 in | |
| December | 43°F (6°C) | 2.8 in |
İznik has a seasonal temperature swing of 33°F / from 39°F in January to 72°F in July. Total annual precipitation is 22.8 inches, with January being the wettest month (2.8") and August the driest (0.9").