Annual mean 16°C · wettest around December · prevailing wind N
Warmest
29.6 °C
Coldest
8.1 °C
Wettest
35%
Windiest
4.9 m/s
Prevailing
N
3.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Istanbul over the whole year is 16°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 6°C. The rainy (wet) season in Istanbul runs from November to March, peaking in December with a 30% chance of rain on a given day. The dry season is April to October; August is the driest month, at 5%. Winds in Istanbul are highest in August, averaging 3.8 m/s (14 km/h), and lightest in May, at 2.8 m/s (10 km/h). The prevailing wind is from the N. The clearest skies in Istanbul come in July, when the sky is typically 30% covered; January is the cloudiest month, at 65%.
Month by month Istanbul climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
9°C
6°C
5°C
28%
65%
3.1 m/s
5
0
39
February
10°C
6°C
6°C
25%
62%
3.1 m/s
9
0
46
March
12°C
7°C
8°C
21%
59%
2.9 m/s
16
0
57
April
16°C
11°C
13°C
12%
50%
2.9 m/s
40
2
75
May
20°C
16°C
19°C
14%
53%
2.8 m/s
72
14
72
June
26°C
21°C
26°C
11%
40%
3.0 m/s
64
55
28
July
28°C
23°C
29°C
8%
30%
3.5 m/s
38
68
10
August
29°C
24°C
29°C
5%
35%
3.8 m/s
34
70
7
September
25°C
20°C
24°C
13%
42%
3.2 m/s
66
48
34
October
20°C
15°C
19°C
15%
49%
2.8 m/s
72
13
71
November
16°C
12°C
13°C
24%
58%
2.9 m/s
39
2
75
December
11°C
8°C
8°C
30%
62%
3.0 m/s
12
0
55
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Istanbul weather by season
Year round, Istanbul has days of about 9°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from 6°C to 24°C through the year, and the average temperature over the year is 16°C around the clock. Rain is most likely around December and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Istanbul weather in winterDecember to February
High 10°CLow 7°CRain 27%
Winter in Istanbul has typical daily highs of about 10°C and lows of about 7°C, with a 27% chance of rain on a given day.
Istanbul weather in springMarch to May
High 16°CLow 11°CRain 16%
Spring in Istanbul has typical daily highs of about 16°C and lows of about 11°C, with a 16% chance of rain on a given day.
Istanbul weather in summerJune to August
High 28°CLow 23°CRain 8%
Summer in Istanbul has typical daily highs of about 28°C and lows of about 23°C, with a 8% chance of rain on a given day.
Istanbul weather in autumnSeptember to November
High 20°CLow 16°CRain 17%
Autumn in Istanbul has typical daily highs of about 20°C and lows of about 16°C, with a 17% chance of rain on a given day.
When is the rainy season in Istanbul?
The rainy (wet) season in Istanbul runs from November to March, peaking in December with a 30% chance of rain on a given day. The dry season is April to October; August is the driest month, at 5%.
What time of year is Istanbul windiest?
Winds in Istanbul are highest in August, averaging 3.8 m/s (14 km/h), and lightest in May, at 2.8 m/s (10 km/h). The prevailing wind is from the N.
What is the average temperature in Istanbul year round?
The average temperature in Istanbul over the whole year is 16°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 6°C.