Istanbul Weather: month-by-month temperatures and rainfall, seasons, winds, what to pack and the best time to visit, based on long-term climate averages.
Istanbul Weather
Seasons, monthly averages and practical tips for planning your trip.
The city has hot, humid summers, cool and wet winters, and mild, pleasant weather in spring and autumn.
This guide explains monthly temperatures and rainfall, each season, local winds, what to pack and when to visit, using long-term climate averages.
Understanding Istanbul Weather
The city has a hot-summer Mediterranean climate (Köppen Csa), shaped by its position between the Black Sea and the Sea of Marmara. Summers are warm to hot and often humid; winters are cool, cloudy and wet, with occasional snow.
Istanbul Weather can vary across the city. Areas near the Black Sea are usually cooler and windier, while inland districts can feel hotter in summer. Conditions can also change quickly, especially in spring and late autumn.
Humidity matters: high humidity makes July and August feel warmer than the numbers suggest, which is why many visitors find June and September more comfortable.
Monthly Istanbul Weather Averages
Average daily high temperatures by month:
| Month | High | Low | Rain | What to expect |
|---|---|---|---|---|
| January | 9°C | 3°C | ~70 mm | Cold, damp, occasional snow |
| February | 9°C | 3°C | ~70 mm | Often the coldest month |
| March | 12°C | 5°C | ~60 mm | Changeable, early spring |
| April | 17°C | 8°C | ~40 mm | Mild, tulip season |
| May | 22°C | 14°C | ~40 mm | Warm and pleasant |
| June | 27°C | 18°C | ~30 mm | Warm, long days |
| July | 30°C | 21°C | ~30 mm | Hot, humid, busy |
| August | 30°C | 22°C | ~30 mm | Hottest, humid |
| September | 26°C | 18°C | ~45 mm | Warm, fewer crowds |
| October | 21°C | 14°C | ~85 mm | Mild, rain increases |
| November | 16°C | 9°C | ~70 mm | Cooler, wetter |
| December | 11°C | 5°C | ~85 mm | Cool, cloudy, wet |
Figures are rounded long-term averages (1991–2020) from a weather station on the European side. Values differ slightly between stations and from year to year, so always check the forecast shortly before your trip.
Istanbul Weather by Season
SpringMar–May
Mild and changeable, warming quickly in May. Tulips fill Emirgan and Gülhane parks in April.
Pack layers and a light rain jacket.
SummerJun–Aug
Warm to hot and humid, with little rain and long evenings by the water.
Plan sightseeing for mornings and evenings.
AutumnSep–Nov
Warm in September, mild in October, then cooler and wetter in November.
Layers work best; bring an umbrella from October.
WinterDec–Feb
Cool, cloudy and wet, with occasional snow, especially in January and February.
Warm coat and waterproof shoes are essential.
Winds, Fog and Snow
Wind is a defining part of Istanbul Weather, and two local winds are especially well known.
Poyraz
North-easterlyA cool wind from the Black Sea. It brings fresh air in summer and can make winter days feel much colder.
Lodos
South-westerlyA warm, gusty wind from the south-west. Strong lodos can cause rough seas and ferry cancellations.
In the cooler months, fog can occasionally slow ferry and shipping traffic on the Bosphorus. Snow falls on a few days in most winters and can briefly disrupt traffic; it rarely lasts long in the city centre.
Best Time to Visit Based on Istanbul Weather
For comfortable sightseeing, the best months are usually April to early June and September to October. Temperatures are pleasant, rain is moderate and crowds are smaller than in midsummer.
Sightseeing
April, May, September and October.
Swimming and beaches
July to early September, when the sea is warmest.
Lower prices and fewer crowds
November to March, outside holiday periods.
Bosphorus cruises
May to October, ideally on calm days.
On the water, conditions can change quickly. Read our guide to a Bosphorus tour in Istanbul for the best times to sail.
What to Pack for Istanbul Weather
- Comfortable shoes for hills and cobbles
- Layers for spring and autumn
- A compact umbrella from October to March
- A warm, waterproof coat in winter
- Sun hat, sunscreen and water in summer
- A light scarf or cover-up for mosque visits
Evenings by the Bosphorus are often cooler and windier than inland streets, even in summer. A light jacket is useful year-round for ferry trips.
Ideas for Rainy or Cold Days
Poor Istanbul Weather does not have to spoil a trip. Many highlights are indoors or covered.
- Topkapı Palace and the Archaeology Museums
- The Basilica Cistern
- The covered Grand Bazaar
- A traditional hamam
- Museums in Beyoğlu and Karaköy
- Tea and coffee in historic cafés
Taksim Square, Beyoğlu
A central base with metro links, museums and covered arcades nearby for any weather.
Checking the Forecast
Averages help with planning, but daily Istanbul Weather can differ widely from them. Check an up-to-date forecast a few days before travel and again each morning.
The Turkish State Meteorological Service (MGM) publishes official forecasts and weather warnings. On windy days, check ferry announcements before heading to the pier, and allow extra time for travel during heavy rain or snow.
Istanbul Weather FAQ
01What is the hottest month in Istanbul?
July and August are the hottest, with average highs around 30°C and high humidity.
02What is the coldest month?
January and February are usually the coldest, with average lows around 3°C.
03Does it snow in Istanbul?
Yes, on a few days most winters, mainly in January and February. Snow rarely lasts long in the centre.
04When is the rainiest time of year?
October to February brings the most rain. Summer is generally dry.
05What is the best month to visit?
April, May, September and October usually offer the most comfortable weather for sightseeing.
06Can I swim in summer?
Yes, from July to early September at supervised beaches. Black Sea currents can be strong, so follow local warnings.
07Is it windy in Istanbul?
Often. The cool poyraz and the warm, gusty lodos are the best-known winds, and strong winds can affect ferries.
08What should I wear in winter?
A warm, waterproof coat, layers and waterproof shoes, plus an umbrella.
Final Thoughts
Istanbul Weather offers something in every season: blooming parks in spring, long summer evenings by the water, golden autumn days and quiet, atmospheric winters.
Use the monthly averages to choose your dates, pack in layers and check the latest forecast before you set off.