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Weather & Climate in Gölcük, Turkey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Gölcük experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 38°F in January while summers reach 71°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 22.4 inches (drier than the 38-inch national average). The city sits at an elevation of 1,407 feet.
Temperature
38°F Jan (3°C)
71°F Jul (22°C)
| Annual Average | 54.3°F |
| 1% above US avg | |
| January Average | 38°F (3°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 295 days/yr |
Geography
| Elevation | 1,407 ft (429 m) |
| Area | 512.3 sq mi (1,326.8 km²) |
| Population Density | 1/sq mi |
| Coordinates | 40.2764°N, 29.3783°W |
| Timezone | Europe/Istanbul |
Precipitation & Snow
Air Quality
Earthquake History
4,591 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 | 67 km | 17 km |
| Apr 23, 2025 | 24 km SE of Marmara Ereğlisi, Turkey | M6.2 | 118 km | 13 km |
| Sep 13, 1999 | 4 km SE of Köseköy, Turkey | M5.9 | 74 km | 13 km |
| May 19, 2011 | 12 km ENE of Simav, Turkey | M5.8 | 128 km | 7 km |
| Nov 11, 1999 | 5 km N of Sapanca, Turkey | M5.7 | 91 km | 22 km |
| Sep 26, 2019 | 17 km ESE of Marmara Ere?lisi, Turkey | M5.7 | 125 km | 8 km |
| Aug 23, 2000 | 8 km E of Akyaz?, Turkey | M5.3 | 122 km | 15 km |
| May 3, 2012 | 13 km NE of Simav, Turkey | M5.2 | 125 km | 3 km |
| Feb 17, 2009 | 5 km ENE of Simav, Turkey | M5.2 | 133 km | 7 km |
| Sep 29, 1999 | 8 km NNW of Ta?köprü, Turkey | M5.2 | 52 km | 10 km |
| Aug 31, 1999 | 2 km NNE of Kar??yaka, Turkey | M5.2 | 68 km | 10 km |
| Aug 19, 1999 | 3 km SSE of Ç?narc?k, Turkey | M5.2 | 43 km | 10 km |
| Jul 25, 2011 | 25 km SW of Marmara Ere?lisi, Turkey | M5.1 | 149 km | 16 km |
| Aug 17, 1999 | 9 km SE of Akyaz?, Turkey | M5.1 | 117 km | 10 km |
| Apr 23, 2025 | 14 km S of Kumburgaz, Turkey | M5.0 | 102 km | 10 km |
| Nov 7, 1999 | 8 km E of Akyaz?, Turkey | M5.0 | 123 km | 10 km |
| Sep 9, 1999 | 7 km NNW of Koruköy, Turkey | M5.0 | 53 km | 13 km |
| Aug 17, 1999 | 2 km NW of Kullar, Turkey | M5.0 | 72 km | 10 km |
| Sep 24, 2019 | 20 km SE of Marmara Ere?lisi, Turkey | M4.9 | 123 km | 10 km |
| Jun 7, 2012 | 13 km SSW of Marmara Ere?lisi, Turkey | M4.9 | 139 km | 15 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
10 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 | 123 km |
| 1894 | MARMARA SEA | Earthquake | 4.5 m | 1,349 | 68 km |
| 1999 | KOCAELI, TURKEY | Earthquake | 2.5 m | 17,118 | 73 km |
| 1963 | MARMARA SEA | Earthquake | 1.0 m | 1 | 50 km |
| 2025 | MARMARA SEA | Earthquake | 0.1 m | — | 122 km |
| 1343 | MARMARA SEA, STRAIT OF BOSPORUS | Earthquake | — | — | 108 km |
| 986 | MARMARA SEA | Earthquake | — | — | 60 km |
| 551 | LEVANTIAN SEA | Earthquake | — | — | 73 km |
| 543 | BLACK SEA | Earthquake | — | — | 134 km |
| 478 | MARMARA SEA | Earthquake | — | — | 60 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 2.9 in | Coldest, Wettest |
| February | 39°F (4°C) | 2.3 in | |
| March | 44°F (7°C) | 2.2 in | |
| April | 52°F (11°C) | 1.9 in | |
| May | 60°F (15°C) | 1.9 in | |
| June | 67°F (19°C) | 1.3 in | |
| July | 71°F (22°C) | 0.9 in | Warmest |
| August | 71°F (22°C) | 0.7 in | Driest |
| September | 65°F (18°C) | 1.3 in | |
| October | 57°F (14°C) | 2.2 in | |
| November | 48°F (9°C) | 2.5 in | |
| December | 41°F (5°C) | 2.5 in |
Gölcük has a seasonal temperature swing of 34°F / from 38°F in January to 71°F in July. Total annual precipitation is 22.4 inches, with January being the wettest month (2.9") and August the driest (0.7").