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Weather & Climate in Kocaeli, Turkey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Kocaeli enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 39°F in January while summers reach 74°F in July. The area gets 285 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 28.0 inches (drier than the 38-inch national average). The city sits at an elevation of 1,017 feet.
Temperature
39°F Jan (4°C)
74°F Jul (23°C)
| Annual Average | 56.1°F |
| 4% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 285 days/yr |
Geography
| Elevation | 1,017 ft (310 m) |
| Area | 315.8 sq mi (818.0 km²) |
| Population Density | 2/sq mi |
| Coordinates | 39.6250°N, 27.5115°W |
| Timezone | Europe/Istanbul |
Precipitation & Snow
Air Quality
Earthquake History
6,396 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.3.
| Jun 12, 2017 | 5 km S of Plomári, Greece | M6.3 | 125 km | 12 km |
| Apr 23, 2025 | 24 km SE of Marmara Ereğlisi, Turkey | M6.2 | 146 km | 13 km |
| Aug 10, 2025 | 10 km WSW of Bigadiç, Turkey | M6.1 | 52 km | 10 km |
| May 19, 2011 | 12 km ENE of Simav, Turkey | M5.8 | 147 km | 7 km |
| Jan 22, 2020 | 15 km ESE of K?rka?aç, Turkey | M5.6 | 68 km | 6 km |
| May 24, 1994 | 4 km NE of Karaburun, Turkey | M5.5 | 136 km | 17 km |
| Jan 28, 1994 | 7 km SW of Saruhanl?, Turkey | M5.4 | 104 km | 5 km |
| Feb 12, 2017 | 24 km WNW of Behram, Turkey | M5.3 | 122 km | 6 km |
| Feb 6, 2017 | 25 km WNW of Behram, Turkey | M5.3 | 124 km | 10 km |
| Jul 6, 2003 | 30 km NE of Gökçeada, Turkey | M5.3 | 147 km | 17 km |
| Feb 7, 2017 | 18 km NNW of Míthymna, Greece | M5.3 | 122 km | 8 km |
| Jul 25, 1999 | 14 km SW of Bigadiç, Turkey | M5.2 | 55 km | 10 km |
| Jun 26, 2020 | 13 km NW of Gölmarmara, Turkey | M5.2 | 96 km | 10 km |
| Feb 17, 2009 | 5 km ENE of Simav, Turkey | M5.2 | 143 km | 7 km |
| Feb 6, 2017 | 23 km WNW of Behram, Turkey | M5.2 | 123 km | 7 km |
| Feb 1, 2021 | 11 km SW of Polichnítos, Greece | M5.2 | 140 km | 10 km |
| May 3, 2012 | 13 km NE of Simav, Turkey | M5.2 | 145 km | 3 km |
| Jun 17, 2017 | 10 km SSE of Plomári, Greece | M5.2 | 125 km | 8 km |
| Jul 25, 2011 | 25 km SW of Marmara Ere?lisi, Turkey | M5.1 | 133 km | 16 km |
| Feb 20, 2019 | 10 km N of Ayvac?k, Turkey | M5.1 | 95 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
14 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 | 140 km |
| 1894 | MARMARA SEA | Earthquake | 4.5 m | 1,349 | 148 km |
| 1912 | MARMARA SEA | Eruption + Earthquake | 2.7 m | 2,800 | 127 km |
| 1949 | CHIOS ISLAND, AEGEAN ISLANDS | Earthquake | 2.0 m | 7 | 134 km |
| 2017 | LESBOS | Earthquake | 0.2 m | 1 | 125 km |
| 2025 | MARMARA SEA | Earthquake | 0.1 m | — | 145 km |
| 1944 | EDREMIT GULF, AEGEAN SEA | Earthquake | — | 30 | 80 km |
| 1935 | MARMARA SEA | Eruption + Earthquake | — | 5 | 111 km |
| 1867 | LESBOS | Earthquake | — | 563 | 107 km |
| 1668 | SMYRNA, W. TURKEY | Earthquake | — | — | 141 km |
| 1343 | MARMARA SEA, STRAIT OF BOSPORUS | Earthquake | — | — | 147 km |
| 1265 | MARMARA SEA | Earthquake | — | — | 120 km |
| 557 | MARMARA SEA | Earthquake | — | — | 142 km |
| 543 | BLACK SEA | Earthquake | — | — | 79 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Kula (145 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kula | Pyroclastic cone(s) | 750 m (2,461 ft) | Unknown | 145 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 4.2 in | Coldest |
| February | 41°F (5°C) | 3.3 in | |
| March | 45°F (7°C) | 2.8 in | |
| April | 53°F (12°C) | 2.5 in | |
| May | 61°F (16°C) | 1.7 in | |
| June | 69°F (21°C) | 0.9 in | |
| July | 74°F (23°C) | 0.4 in | Warmest, Driest |
| August | 73°F (23°C) | 0.6 in | |
| September | 67°F (20°C) | 1.0 in | |
| October | 58°F (15°C) | 2.0 in | |
| November | 49°F (9°C) | 3.5 in | |
| December | 43°F (6°C) | 5.1 in | Wettest |
Kocaeli has a seasonal temperature swing of 34°F / from 39°F in January to 74°F in July. Total annual precipitation is 28.0 inches, with December being the wettest month (5.1") and July the driest (0.4").