The Basilica Cistern is an ancient underground cistern located next to the Hagia Sophia in Istanbul, Turkey. Built in the 6th century (532 AD) by the Byzantine Emperor Justinian I to solve the city's drinking water problem, this magnificent underground structure, supported by 336 marble columns, is known as the "Sunken Palace." It features the famous Medusa's Head and the Tear Column and is now a popular tourist attraction.
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Istanbul Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Istanbul year round climate
Spring (March–May): Average 8.6–17°C, mild climate, but occasionally rainy; March and April can still be somewhat chilly, warming up in May. Common activities: Visiting historical sites, strolling along the Bosphorus Strait, exploring bazaars. Recommended clothing: Light jacket, long-sleeved shirts, comfortable walking shoes.
Summer (June–August): Average 23.6–26.6°C, hot and dry, sunny, but occasional brief showers. Common activities: Beach relaxation, boat tours, savoring Turkish cuisine. Recommended clothing: Light and breathable clothing, sun hat, sunglasses.
Autumn (September–November): Average 18–14°C, temperatures gradually decrease; November has more rainfall and higher humidity. Common activities: Visiting museums, admiring Istanbul's autumn scenery, enjoying seasonal cuisine. Recommended clothing: Comfortable warm clothing such as cardigans, jackets, and rain gear.
Winter (December–February): Average 7.8–10.8°C, cold and humid, occasional snowfall. Common activities: Indoor visits, experiencing a Turkish bath (Hamam), enjoying hot drinks. Recommended clothing: Warm coat, scarf, hat, gloves.
Istanbul climatological average
Annual average temperature: approx. 16.5°C / Annual rainfall: approx. 615 mm / Summer humidity: 60%–70% / Rainiest month: November
Istanbul monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
7.8°C
74.9
February
8.1°C
64.3
March
8.6°C
68.1
April
14°C
73.7
May
17°C
45.2
June
23.6°C
21.7
July
26.5°C
10.9
August
26.6°C
27.2
September
22.9°C
21.8
October
18°C
22.6
November
14°C
118.9
December
10.8°C
66.2
Istanbul weather for the next seven days
4/21
Tuesday
Patchy rain nearby
17.3°C/11.9°C
4/22
Wednesday
Moderate rain
13°C/8.5°C
4/23
Thursday
Patchy rain nearby
13.2°C/8.7°C
4/24
Friday
Patchy rain nearby
13.1°C/9.6°C
4/25
Saturday
Moderate rain
12.5°C/8.1°C
4/26
Sunday
Sunny
14.5°C/7.7°C
4/27
Monday
Sunny
15.8°C/7.8°C
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