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Weather & Climate in Gölcük, Turkey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Gölcük enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 41°F in January while summers reach 72°F in July. The area gets 284 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 28.6 inches (drier than the 38-inch national average). The city sits at an elevation of 184 feet.
Temperature
41°F Jan (5°C)
72°F Jul (22°C)
| Annual Average | 56.0°F |
| 4% above US avg | |
| January Average | 41°F (5°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 284 days/yr |
Geography
| Elevation | 184 ft (56 m) |
| Area | 79.9 sq mi (207.0 km²) |
| Population Density | 703/sq mi |
| Coordinates | 40.7150°N, 29.8182°W |
| Timezone | Europe/Istanbul |
Precipitation & Snow
Air Quality
Earthquake History
3,480 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 | 5 km | 17 km |
| Nov 12, 1999 | 8 km S of Düzce, Turkey | M7.2 | 113 km | 10 km |
| Apr 23, 2025 | 24 km SE of Marmara Ereğlisi, Turkey | M6.2 | 138 km | 13 km |
| Sep 13, 1999 | 4 km SE of Köseköy, Turkey | M5.9 | 19 km | 13 km |
| Sep 26, 2019 | 17 km ESE of Marmara Ere?lisi, Turkey | M5.7 | 142 km | 8 km |
| Nov 11, 1999 | 5 km N of Sapanca, Turkey | M5.7 | 38 km | 22 km |
| Nov 12, 1999 | 7 km SSW of Düzce, Turkey | M5.5 | 110 km | 10 km |
| Aug 23, 2000 | 8 km E of Akyaz?, Turkey | M5.3 | 76 km | 15 km |
| Aug 31, 1999 | 2 km NNE of Kar??yaka, Turkey | M5.2 | 11 km | 10 km |
| Aug 19, 1999 | 3 km SSE of Ç?narc?k, Turkey | M5.2 | 58 km | 10 km |
| Sep 29, 1999 | 8 km NNW of Ta?köprü, Turkey | M5.2 | 40 km | 10 km |
| Nov 12, 1999 | 11 km W of Bolu, Turkey | M5.2 | 139 km | 10 km |
| Aug 17, 1999 | 9 km SE of Akyaz?, Turkey | M5.1 | 74 km | 10 km |
| Nov 7, 1999 | 8 km E of Akyaz?, Turkey | M5.0 | 77 km | 10 km |
| Aug 26, 2001 | 24 km N of Bolu, Turkey | M5.0 | 150 km | 8 km |
| Aug 17, 1999 | 2 km NW of Kullar, Turkey | M5.0 | 13 km | 10 km |
| Sep 9, 1999 | 7 km NNW of Koruköy, Turkey | M5.0 | 57 km | 13 km |
| Apr 23, 2025 | 14 km S of Kumburgaz, Turkey | M5.0 | 114 km | 10 km |
| Apr 23, 2025 | 24 km SSW of Selimpaşa, Turkey | M4.9 | 131 km | 10 km |
| Aug 17, 1999 | 11 km ESE of Akyaz?, Turkey | M4.9 | 79 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 | 145 km |
| 1894 | MARMARA SEA | Earthquake | 4.5 m | 1,349 | 95 km |
| 1999 | KOCAELI, TURKEY | Earthquake | 2.5 m | 17,118 | 14 km |
| 1963 | MARMARA SEA | Earthquake | 1.0 m | 1 | 56 km |
| 2025 | MARMARA SEA | Earthquake | 0.1 m | — | 142 km |
| 1343 | MARMARA SEA, STRAIT OF BOSPORUS | Earthquake | — | — | 128 km |
| 986 | MARMARA SEA | Earthquake | — | — | 53 km |
| 551 | LEVANTIAN SEA | Earthquake | — | — | 12 km |
| 478 | MARMARA SEA | Earthquake | — | — | 53 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 3.4 in | Coldest |
| February | 42°F (5°C) | 2.6 in | |
| March | 45°F (7°C) | 2.5 in | |
| April | 53°F (12°C) | 2.0 in | |
| May | 61°F (16°C) | 1.9 in | |
| June | 68°F (20°C) | 1.6 in | |
| July | 72°F (22°C) | 1.2 in | Driest |
| August | 72°F (22°C) | 1.4 in | Warmest |
| September | 66°F (19°C) | 1.9 in | |
| October | 59°F (15°C) | 3.1 in | |
| November | 51°F (11°C) | 3.1 in | |
| December | 45°F (7°C) | 4.0 in | Wettest |
Gölcük has a seasonal temperature swing of 31°F / from 41°F in January to 72°F in August. Total annual precipitation is 28.6 inches, with December being the wettest month (4.0") and July the driest (1.2").