Climate figures in this guide come from long-term Istanbul meteorological records (Turkish State Meteorological Service, 1991–2020 climate normals). Cassidy Rush researched this guide using published meteorological data and current UK travel guidance for Türkiye, alongside a background in researching practical, finance-adjacent travel topics for UK readers planning trips abroad.
What is Istanbul’s weather like? (quick answer)
Istanbul weather by month follows a temperate pattern: hot, humid summers and cool, wet winters, shaped by the city’s position between the Black Sea and the Sea of Marmara. July and August are the hottest months, with average highs around 30°C; January is the coldest, with an average high around 9°C. July is the driest month, with August also particularly dry, making summer a popular time for UK visitors. Istanbul is generally warmer and sunnier than the UK during summer, with more rain than snow in winter. Turkish also uses the Latin alphabet, one of the more familiar writing systems of the world, so street signs are easy to follow.
At a glance
- Hottest month: July (average high around 30°C)
- Coldest month: January (average high around 9°C)
- Wettest month: December (around 87mm of rain)
- Driest month: July (around 20mm of rain)
- Best time for UK visitors: late April to early June, or September
Istanbul weather by month: full monthly breakdown
Figures are long-term averages (1991–2020 climate normals) compiled from Turkish State Meteorological Service records.
| Month | Avg high °C | Avg low °C | Rainfall (mm) | Sunshine (hrs/day) | Sea temp °C |
| January | 9 | 4 | 72 | 3 | 9 |
| February | 10 | 4 | 79 | 4 | 8 |
| March | 12 | 5 | 61 | 5 | 8 |
| April | 17 | 9 | 52 | 7 | 11 |
| May | 22 | 13 | 30 | 9 | 16 |
| June | 27 | 18 | 32 | 11 | 21 |
| July | 30 | 21 | 20 | 12 | 24 |
| August | 30 | 21 | 26 | 11 | 25 |
| September | 26 | 17 | 45 | 8 | 23 |
| October | 21 | 14 | 80 | 6 | 19 |
| November | 16 | 9 | 69 | 4 | 15 |
| December | 11 | 5 | 87 | 3 | 11 |
These figures show warm, dry summers giving way to a wetter, cooler second half of the year. June to August is peak season, with temperatures regularly in the high twenties and relatively little rain. April, May, September and October are shoulder months, milder with fewer crowds. Compared with London, Istanbul is generally warmer in summer and has a distinctly drier summer season, while winters are cool and considerably wetter than its summers.
Spring in Istanbul (March – May)
March is still cool, with highs around 12°C and the occasional shower. By April, highs reach around 17°C and the city’s parks come into bloom — April is also when the Istanbul Tulip Festival fills spaces like Emirgan Park with colour, though pollen levels can be higher for hay fever sufferers. May brings highs around 22°C with far less rain than winter. For UK visitors who find heat above 30°C uncomfortable, spring is one of the most comfortable times to explore on foot.
Summer in Istanbul (June – August)
June, July and August are Istanbul’s hottest months, with highs climbing into the high twenties and touching 30°C in July and August. Istanbul can also feel humid during summer, which can make the heat feel more intense than the thermometer suggests. Sightseeing is more comfortable in the early morning or evening, when the sun is lower and streets are quieter. Because summer is peak season, accommodation costs rise and sites like the Hagia Sophia and the Blue Mosque see longer queues, so planning visits ahead can help
Autumn in Istanbul (September – November)
September is often the sweet spot for UK travellers: highs still reach around 26°C, crowds thin out, and accommodation prices tend to ease. October cools further, with highs around 21°C and rainfall increasing to roughly 80mm. November remains relatively wet, with around 69mm of rain and highs closer to 16°C, conditions not unlike a typical British autumn, though experiences will vary depending on where in the UK you’re comparing it with. Weighed against high summer, the trade-off is a few degrees cooler for smaller crowds and potentially lower prices.
Winter in Istanbul (December – February)
Winter in Istanbul is cool and wet. December is the wettest month, with around 87mm of rain and highs around 11°C; January and February are colder, with average highs of 9–10°C and average lows around 4°C, although colder nights can fall towards freezing. A cold northeasterly wind known locally as the Poyraz can make winter days feel sharper than the temperature suggests. Snow can occur during winter, although rain is considerably more common. Istanbul saw a notable multi-day snowfall in January 2017 that closed schools and disrupted flights and ferries.
Winter suits budget-conscious visitors and indoor sights like the Hagia Sophia, the Blue Mosque and Topkapi Palace, where visitors should be prepared to follow site-specific dress requirements. If your trip falls during Ramadan (Ramazan in Turkish), some restaurants may adjust their daytime hours, though tourist areas generally continue to serve visitors.
Best time to visit Istanbul for UK travellers
For most UK travellers, late April to early June or September gives a good mix of warm weather, manageable crowds and potentially lower prices than peak summer. Several airlines fly direct from UK airports, with a journey time of around four hours. Before you book, check how long it takes to get a passport if you don’t already have one, and check gov.uk for the latest UK entry requirements for Türkiye, as rules can change.
- Want reliably warm weather: aim for June to August, and expect busier sights.
- Prefer to avoid the heat: late April, May or September offer highs from the high teens into the mid-twenties
- Travelling on a budget: consider November to March, when flights and hotels can be cheaper, though pack for rain.
If you’re hiring a car, it’s worth knowing Türkiye isn’t one of the right-hand drive countries like the UK, so you’ll be driving on the opposite side of the road. UK visitors should also check the current driving-document requirements before travelling, including whether they need an International Driving Permit or a notarised translation of their UK licence.
What to pack for Istanbul: a month-by-month checklist
Spring (March–May)
- Layers you can add or remove as the day warms up
- A light waterproof jacket for occasional showers
- Comfortable shoes for cobbled streets
- Antihistamines if you’re sensitive to spring pollen
Summer (June–August)
- Light, breathable clothing and a sun hat
- Sunscreen, since summer UV levels run high
- A modest cover-up (shoulders and knees) for mosque visits
- A reusable water bottle
Autumn (September–November)
- A waterproof jacket, especially by October and November
- Layers for cooler evenings
- Comfortable shoes for walking in occasional rain
Winter (December–February)
- A warm coat, scarf and gloves
- A waterproof jacket or umbrella for frequent rain
- A UK-to-European Type C/F plug adaptor for charging devices
If you’re keeping an eye on costs, our guide to currency in Asia has useful background on managing money on a trip. If your passport is close to expiring, it’s worth knowing how a fast-track passport service works.
Frequently Asked Questions (FAQs)
What’s the best time to visit Istanbul for good weather?
Late April to early June and September usually offer a good mix of warm weather and more comfortable sightseeing conditions. June to August is hottest, with average highs approaching 30°C, while November to March brings cooler, generally wetter conditions.
How does Istanbul’s weather compare to the UK?
Istanbul generally has hotter, drier and sunnier summers than the UK. Winters are cool and wetter than Istanbul’s summers, with average daytime highs around 9–11°C. Rain is considerably more common than snow, although cold spells and snowfall can occur.
Are there extreme weather conditions to know about in Istanbul?
Severe weather isn’t the norm in Istanbul, but periods of intense heat, heavy rain, strong winds and occasional disruptive snowfall can occur. A cold northeasterly wind called the Poyraz can also make winter days feel colder than the temperature suggests.
What should I pack for a trip to Istanbul?
Pack layers year-round, since mornings and evenings can be cooler than midday. Add a sun hat and sunscreen for summer, a waterproof jacket for wetter months, and warm layers for winter. A modest cover-up helps for mosque visits, alongside comfortable walking shoes.
Does Istanbul get snow in winter?
Snow can occur in Istanbul during winter, although rain is much more common. Some winters bring little significant snowfall, while heavier snow can occasionally disrupt the city. Istanbul experienced a notable multi-day snowfall in January 2017 that closed schools and disrupted transport.
Is Istanbul colder than the UK in winter?
Istanbul’s average winter daytime temperatures are broadly comparable with milder parts of the UK, with average highs around 9–11°C. Rain is much more common than snow, although colder spells can bring temperatures close to or below freezing and occasional snowfall.
Do UK travellers need a visa to visit Istanbul?
British citizens travelling on a full British citizen passport can currently visit Türkiye without a visa for up to 90 days in any 180-day period for tourism or business. Other types of British passport may have different requirements, so check GOV.UK before travelling. Passport validity requirements also apply.
Key takeaways
- Istanbul has a temperate climate: hot summers and cool, wet winters. Average highs reach around 30°C in July and August and fall to around 9–11°C during winter.
- July is the driest month, with August also relatively dry; December is the wettest, with around 87mm of rain according to the 1991–2020 Istanbul/Florya climate normals.
- Late April to early June and September offer a good balance of warm weather and potentially smaller crowds for UK visitors.
- Summer brings peak-season temperatures and crowds; winter is cooler and wetter, with occasional snow.
- British citizens travelling on a full British citizen passport can currently visit Türkiye visa-free for tourism or business for up to 90 days in any 180-day period, but travellers should check GOV.UK for current entry requirements before booking.
Choosing your Istanbul travel window
Whichever season you choose, Istanbul’s weather rarely rules out a good trip, it just changes what you’ll want to pack. With a little planning, 2026 is a good year to add Istanbul to your travel list.
Sources
- Turkish State Meteorological Service (Meteoroloji Genel Müdürlüğü, MGM)
Istanbul/Florya climate statistics and 1991–2020 climate normals, including monthly average temperatures, precipitation and sunshine duration: https://www.mgm.gov.tr/veridegerlendirme/il-ve-ilceler-istatistik.aspx - UK Government, Foreign Travel Advice: Türkiye, Entry Requirements
Current passport and visa requirements for British travellers visiting Türkiye: https://www.gov.uk/foreign-travel-advice/turkey/entry-requirements - Current travel, driving, weather and safety information for British visitors: https://www.gov.uk/foreign-travel-advice/turkey/safety-and-security
- Istanbul Metropolitan Municipality (İBB)
Official information about Emirgan and Istanbul’s annual tulip displays and festival: https://istanbuluseyret.ibb.istanbul/en/touristic-camera/emirgan2026 - Istanbul Tulip Festival information: https://istanbulseninhaber.ibb.istanbul/haber-detay/istanbulda-lale-bayrami
Last reviewed: September 2026
