Weather in Istanbul

Weather - Istanbul

Istanbul's climate blends mild, wet winters with hot, sunny summers — ideal for a city break almost any time of year. Winters (December–February) are the rainiest and coolest months, while summer (June–August) brings long sunny days, high UV and warm sea temperatures for swimming. Shoulder seasons (April–May and September–October) offer the best balance of pleasant temperatures, fewer crowds and lower chance of heavy rain — perfect for sightseeing and catching good flight deals.

Weather - Istanbul - January

January is one of the coldest and wettest months: average highs around 8°C and lows near 5°C, about 110 mm of monthly rainfall and roughly 19 days with some rain. Days are short but you can still enjoy museum visits and indoor attractions — bring a warm, waterproof layer.

Weather - Istanbul - February

February stays cool with average highs around 9°C and lows near 5°C. Rain decreases slightly (≈75 mm) and sunshine increases a little, making it a quieter month for sightseeing and cheaper flights compared with spring and summer.

Weather - Istanbul - March

March marks the start of spring: highs climb to about 11°C and lows to 6°C, monthly rainfall around 72 mm and more daylight. Temperatures are comfortable for walking tours; pack layers for cooler mornings and breezy evenings.

Weather - Istanbul - April

April is pleasantly mild with average highs near 15°C and lows around 9°C, reduced rainfall (≈50 mm) and roughly 8 hours of sunshine per day. Spring blossoms and comfortable weather make it one of the best months for exploring the city on foot.

Weather - Istanbul - May

May brings warmer days (avg high ~20°C, low ~14°C), low rainfall (≈35 mm) and about 10 hours of daily sunshine. Sea temperatures rise to around 15°C — shoulder-season warmth with fewer crowds than peak summer.

Weather - Istanbul - June

June is warm and sunny with average highs around 25°C and lows near 19°C, limited rain (≈28 mm) and about 11 hours of sunshine. The sea warms to roughly 21°C — good for cooling off after a day of sightseeing.

Weather - Istanbul - July

July is typically the warmest month: highs near 27°C and lows around 22°C, low precipitation (~25 mm) and long sunny days. UV index peaks (around 9), so sun protection is essential for outdoor activities and beachside breaks.

Weather - Istanbul - August

August remains hot and dry (avg high ~27°C, low ~22°C) with the sea at its warmest (~24°C). Expect plenty of sunshine, occasional breezy spells and ideal conditions for swimming and late-afternoon terraces.

Weather - Istanbul - September

September offers a pleasant return to milder temperatures (avg high ~24°C, low ~19°C), still-warm sea (≈22°C) and moderate rainfall (≈43 mm). It's a great month to combine beach time with cultural sightseeing.

Weather - Istanbul - October

October cools to comfortable daytime temperatures (avg high ~19°C, low ~15°C) but rainfall increases (≈76 mm). Days shorten and the city becomes cozier — ideal for indoor attractions, culinary tours and off-peak travel deals.

Weather - Istanbul - November

November is noticeably cooler (avg high ~15°C, low ~11°C) with higher rainfall (≈97 mm) and fewer sunny hours. Expect wet days and pack waterproof footwear and an umbrella if you plan to explore outdoors.

Weather - Istanbul - December

December is one of the wettest months (≈126 mm) with average highs around 11°C and lows near 7°C. Short daylight hours and frequent rain make it a low-season time for tourism — good for catching lower airfares and enjoying indoor cultural sites.

Seasons and swimming in Istanbul

Spring (April–May) and autumn (September–October) are the sweet spots for sightseeing: mild weather, fewer crowds and pleasant daylight. Summer (June–August) is perfect for swimming — sea temperatures reach 21–24°C — but expect higher UV and busy tourist areas. Winter is wet and cool; ideal if you prefer museums, local cuisine and lower prices.

Table of temperatures throughout the year