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Weather & Climate in Başakşehir, Turkey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Başakşehir enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 47°F in January while summers reach 78°F in July. The area gets 288 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 35.0 inches. The area receives 6.4 inches of snow annually. The city sits at an elevation of 509 feet.
Temperature
47°F Jan (9°C)
78°F Jul (26°C)
| Annual Average | 60.5°F |
| 12% above US avg | |
| January Average | 47°F (9°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 288 days/yr |
Geography
| Elevation | 509 ft (155 m) |
| Area | 5.1 sq mi (13.1 km²) |
| Population Density | 38,291/sq mi |
| Coordinates | 41.1060°N, 28.7910°W |
| Timezone | Europe/Istanbul |
Precipitation & Snow
Air Quality
Earthquake History
2,585 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 | 99 km | 17 km |
| Apr 23, 2025 | 24 km SE of Marmara Ereğlisi, Turkey | M6.2 | 59 km | 13 km |
| Sep 13, 1999 | 4 km SE of Köseköy, Turkey | M5.9 | 114 km | 13 km |
| Nov 11, 1999 | 5 km N of Sapanca, Turkey | M5.7 | 130 km | 22 km |
| Sep 26, 2019 | 17 km ESE of Marmara Ere?lisi, Turkey | M5.7 | 58 km | 8 km |
| Aug 19, 1999 | 3 km SSE of Ç?narc?k, Turkey | M5.2 | 62 km | 10 km |
| Aug 31, 1999 | 2 km NNE of Kar??yaka, Turkey | M5.2 | 107 km | 10 km |
| Sep 29, 1999 | 8 km NNW of Ta?köprü, Turkey | M5.2 | 62 km | 10 km |
| Jul 25, 2011 | 25 km SW of Marmara Ere?lisi, Turkey | M5.1 | 94 km | 16 km |
| Apr 23, 2025 | 14 km S of Kumburgaz, Turkey | M5.0 | 35 km | 10 km |
| Sep 9, 1999 | 7 km NNW of Koruköy, Turkey | M5.0 | 52 km | 13 km |
| Aug 17, 1999 | 2 km NW of Kullar, Turkey | M5.0 | 107 km | 10 km |
| Jun 7, 2012 | 13 km SSW of Marmara Ere?lisi, Turkey | M4.9 | 79 km | 15 km |
| Apr 23, 2025 | 24 km SSW of Selimpaşa, Turkey | M4.9 | 52 km | 10 km |
| Aug 17, 1999 | 9 km ESE of Köseköy, Turkey | M4.9 | 119 km | 10 km |
| Jan 11, 2020 | 16 km S of Silivri, Turkey | M4.9 | 50 km | 10 km |
| Sep 24, 2019 | 20 km SE of Marmara Ere?lisi, Turkey | M4.9 | 61 km | 10 km |
| Feb 12, 1991 | 18 km SW of K?nal?, Turkey | M4.8 | 33 km | 10 km |
| Aug 26, 1999 | 0 km ENE of Köseköy, Turkey | M4.8 | 111 km | 10 km |
| Mar 22, 1992 | 3 km SSW of Karacabey, Turkey | M4.8 | 109 km | 19 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 | 67 km |
| 1894 | MARMARA SEA | Earthquake | 4.5 m | 1,349 | 57 km |
| 1912 | MARMARA SEA | Eruption + Earthquake | 2.7 m | 2,800 | 146 km |
| 1999 | KOCAELI, TURKEY | Earthquake | 2.5 m | 17,118 | 106 km |
| 1963 | MARMARA SEA | Earthquake | 1.0 m | 1 | 55 km |
| 2025 | MARMARA SEA | Earthquake | 0.1 m | - | 62 km |
| 1935 | MARMARA SEA | Eruption + Earthquake | - | 5 | 125 km |
| 1343 | MARMARA SEA, STRAIT OF BOSPORUS | Earthquake | - | - | 54 km |
| 1265 | MARMARA SEA | Earthquake | - | - | 125 km |
| 986 | MARMARA SEA | Earthquake | - | - | 48 km |
| 557 | MARMARA SEA | Earthquake | - | - | 103 km |
| 551 | LEVANTIAN SEA | Earthquake | - | - | 99 km |
| 543 | BLACK SEA | Earthquake | - | - | 123 km |
| 478 | MARMARA SEA | Earthquake | - | - | 48 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (9°C) | 3.7 in | |
| February | 42°F (6°C) | 2.5 in | Coldest |
| March | 45°F (7°C) | 2.5 in | |
| April | 53°F (12°C) | 1.9 in | |
| May | 61°F (16°C) | 1.5 in | |
| June | 70°F (21°C) | 1.3 in | |
| July | 78°F (26°C) | 0.9 in | Warmest, Driest |
| August | 74°F (23°C) | 1.3 in | |
| September | 68°F (20°C) | 1.6 in | |
| October | 60°F (16°C) | 2.8 in | |
| November | 52°F (11°C) | 3.4 in | |
| December | 46°F (8°C) | 4.3 in | Wettest |
Başakşehir has a seasonal temperature swing of 36°F / from 42°F in February to 78°F in July. Total annual precipitation is 27.6 inches, with December being the wettest month (4.3") and July the driest (0.9").