Başakşehir climate — normals and trends
Başakşehir (Republic of Türkiye) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 14.9 °C and it receives 585 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (24.1 °C on average) and the coldest is January (6.7 °C). Rainfall peaks in December.
Başakşehir averages 4 frost days, 2 hot days (≥ 30 °C) and 92 rainy days per year.
Başakşehir has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 7 to 1 per year over the period.
The hottest day of the period reached 33.8 °C (on 23 July 2025) and the coldest -6.2 °C (on 3 January 1942).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
BaşakşehirIstanbul
- coords
- 41.11°, 28.79°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.9°C
Average daily high
16.9°C
Average daily low
13.1°C
Annual rainfall
585mm
Sunshine / day
9.6h
Mean relative humidity
76%
Average peak wind
24.5km/h
Seasonal range
17.4°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
92 d/yr
Annual snowfall
17.0 cm
Average feels-like high
15.6 °C
Average feels-like low
10.7 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
76 d/yr
Solar radiation
15.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.39 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
33.8 °C
23 July 2025
Coldest day
-6.2 °C
3 January 1942
Wettest day
86 mm
18 December 1963
Windiest day
60.5 km/h
22 January 2004
Strongest gust
107.6 km/h
22 November 2008
Hottest feels-like
37.9 °C
12 August 2010
Coldest feels-like
-12.7 °C
3 January 1942
Snowiest day
27.9 cm
30 January 1945
Sunniest day
14.2 h
1 July 2017
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 11.0 °C | +2.7 °C | 75 mm | -5 mm |
| Feb | 6.9 °C | -1.4 °C | 73 mm | +6 mm |
| Mar | 12.9 °C | +3.1 °C | 17 mm | -44 mm |
| Apr | 13.5 °C | -0.3 °C | 39 mm | -3 mm |
| May | 19.3 °C | +0.7 °C | 31 mm | +3 mm |
| Jun | 25.7 °C | +2.0 °C | 1 mm | -24 mm |
| Jul | 29.2 °C | +2.8 °C | 1 mm | -17 mm |
| Aug | 27.6 °C | +1.1 °C | 3 mm | -13 mm |
| Sep | 24.5 °C | +1.2 °C | 28 mm | -4 mm |
| Oct | 19.2 °C | +0.5 °C | 129 mm | +74 mm |
| Nov | 17.6 °C | +3.2 °C | 49 mm | -22 mm |
| Dec | 11.9 °C | +1.3 °C | 59 mm | -33 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Başakşehir?
Başakşehir has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 14.9 °C and it receives 585 mm of precipitation per year.
What is the hottest day ever recorded in Başakşehir?
The hottest day measured in Başakşehir between 1940 and 2025 was 23 July 2025, reaching 33.8 °C.
What is the coldest day in Başakşehir?
The coldest day measured in Başakşehir between 1940 and 2025 was 3 January 1942, at -6.2 °C.
Does it snow in Başakşehir?
Yes. Başakşehir gets on average 17.0 cm of snow per year and has around 4 frost days.
Has the climate of Başakşehir warmed?
Yes: Başakşehir warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Başakşehir?
The wettest day measured in Başakşehir between 1940 and 2025 was 18 December 1963, with 86 mm of rain in 24 hours.
What was the windiest day in Başakşehir?
The windiest day measured in Başakşehir between 1940 and 2025 was 22 January 2004, with winds reaching 60.5 km/h.
What is the warmest month in Başakşehir?
The warmest month in Başakşehir is August (24.1 °C on average); the coldest is January (6.7 °C).
How much does it rain in Başakşehir?
Başakşehir receives on average 585 mm of precipitation per year, spread over about 92 rainy days.
Is it sunny in Başakşehir?
Başakşehir gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
What is the biggest single-day snowfall in Başakşehir?
The heaviest 24-hour snowfall measured in Başakşehir between 1940 and 2025 was 30 January 1945, with 27.9 cm.
Are there tropical nights in Başakşehir?
Yes: Başakşehir has on average 76 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Başakşehir?
In Başakşehir, between 1940 and 2025, the highest apparent temperature reached 37.9 °C on 12 August 2010, and the lowest was -12.7 °C on 3 January 1942.
Compare Başakşehir with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Başakşehir