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Weather in Istanbul - 14-day forecast

Detailed weather forecast for Istanbul, Turkey: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Istanbul
today☀️ 29°night 24°
Sun☀️ 29°💧 6.9 mm
Mon☀️ 28°💧 0.2 mm
Tue☀️ 25°💧 18.8 mm
Wed🌤️ 25°night 23°
Thu☀️ 25°💧 0.5 mm
Fri☀️ 26°💧 0.2 mm
Sat☀️ 25°💧 5.5 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in Istanbul, the forecast high is 29°C. Typical daytime temperatures at this time of year range from 24°C to 28°C, so it will be warmer than usual. It is warmer than 84% of similar days.

29°Cwarmer than usual
usually 24°C–29°C
warmer than 82% of similar days
night: exceptionally warm rain: less rain than usual wind: typical
29°Cwarmer than usual
usually 24°C–28°C
warmer than 84% of similar days
night: exceptionally warm rain: exceptionally wet wind: typical
28°Cwarmer than usual
usually 24°C–28°C
warmer than 77% of similar days
night: exceptionally warm rain: more rain than usual wind: typical
25°Cnear normal
usually 24°C–28°C
night: exceptionally warm rain: exceptionally wet wind: typical
25°Cnear normal
usually 24°C–28°C
night: exceptionally warm rain: less rain than usual wind: typical
25°Cnear normal
usually 24°C–28°C
night: exceptionally warm rain: more rain than usual wind: typical
26°Cnear normal
usually 24°C–28°C
night: exceptionally warm rain: more rain than usual wind: typical

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
15°25°35° 1981: 24°C1982: 26°C1983: 25°C1984: 26°C1985: 24°C1986: 25°C1987: 25°C1988: 23°C1989: 26°C1990: 26°C1991: 21°C1992: 25°C1993: 25°C1994: 29°C1995: 27°C1996: 23°C1997: 23°C1998: 25°C1999: 24°C2000: 24°C2001: 27°C2002: 26°C2003: 23°C2004: 22°C2005: 26°C2006: 26°C2007: 25°C2008: 28°C2009: 25°C2010: 26°C2011: 28°C2012: 26°C2013: 27°C2014: 27°C2015: 29°C2016: 28°C2017: 28°C2018: 27°C2019: 27°C2020: 28°C2021: 25°C2022: 27°C2023: 27°C2024: 29°C2025: 27°C 2026 forecast: 27°C current forecast 27°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 26°C by day. The coolest year was 1991 (21°C) and the warmest was 2015 (29°C). The current forecast averages 27°C - higher than in 76% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Istanbul

Istanbul - 14-day weather forecast infographic

Istanbul 30 & 45-day weather - long-range outlook

Next 16 days · forecast
26°
around 24° at night · days with rain: 4
Weeks 3-4 · avg for September
26°
around 25° at night · rain chance 33%
Weeks 5-7 · avg for October
20°
around 13° at night · rain chance 32%
The 30 & 45-day outlook for Istanbul: the next 16 days are a numerical forecast updated daily - on average 26° by day and 24° at night. Further out we rely on multi-year climate averages: around 26° in September, and about 20° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Istanbul

Saturday5 September 2026
☀️29°clear sky
sunrise 06:34 · sunset 19:31 · night 24° · evening 26° · humidity 40% · wind 6 m/s · clouds 1%
Sunday6 September 2026
☀️29°clear sky
sunrise 06:35 · sunset 19:29 · night 24° · evening 25° · rain 6.93 mm · humidity 39% · wind 8 m/s · clouds 36%
Monday7 September 2026
☀️28°clear sky
sunrise 06:36 · sunset 19:28 · night 22° · evening 24° · rain 0.24 mm · humidity 40% · wind 8 m/s · clouds 3%
Tuesday8 September 2026
☀️25°clear sky
sunrise 06:37 · sunset 19:26 · night 22° · evening 23° · rain 18.84 mm · humidity 41% · wind 8 m/s · clouds 38%
Wednesday9 September 2026
🌤️25°scattered clouds
sunrise 06:38 · sunset 19:24 · night 23° · evening 24° · humidity 47% · wind 8 m/s · clouds 49%
Thursday10 September 2026
☀️25°clear sky
sunrise 06:39 · sunset 19:23 · night 23° · evening 24° · rain 0.54 mm · humidity 56% · wind 8 m/s · clouds 1%
Friday11 September 2026
☀️26°clear sky
sunrise 06:40 · sunset 19:21 · night 23° · evening 25° · rain 0.18 mm · humidity 50% · wind 7 m/s · clouds 1%
Saturday12 September 2026
☀️25°clear sky
sunrise 06:41 · sunset 19:19 · night 25° · evening 28° · rain 5.49 mm · humidity 47% · wind 3 m/s · clouds 13%
Sunday13 September 2026
☀️27°clear sky
sunrise 06:42 · sunset 19:18 · night 28° · evening 29° · rain 4.95 mm · humidity 44% · wind 3 m/s · clouds 60%
Monday14 September 2026
🌤️24°scattered clouds
sunrise 06:43 · sunset 19:16 · night 21° · evening 23° · humidity 55% · wind 6 m/s · clouds 47%
Tuesday15 September 2026
☀️25°clear sky
sunrise 06:44 · sunset 19:14 · night 23° · evening 25° · humidity 59% · wind 6 m/s · clouds 6%
Wednesday16 September 2026
☀️26°clear sky
sunrise 06:45 · sunset 19:12 · night 27° · evening 29° · humidity 54% · wind 5 m/s · clouds 1%
Thursday17 September 2026
☁️29°overcast clouds
sunrise 06:46 · sunset 19:11 · night 27° · evening 29° · humidity 40% · wind 5 m/s · clouds 100%
Friday18 September 2026
☀️25°clear sky
sunrise 06:47 · sunset 19:09 · night 22° · evening 24° · humidity 51% · wind 6 m/s · clouds 5%
Saturday19 September 2026
🌧️24°light rain
sunrise 06:48 · sunset 19:07 · night 22° · evening 24° · rain 0.42 mm · humidity 70% · wind 5 m/s · clouds 95%
Sunday20 September 2026
☀️25°clear sky
sunrise 06:49 · sunset 19:06 · night 25° · evening 25° · humidity 57% · wind 5 m/s · clouds 10%

UV index in Istanbul - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTIstanbul03681111+6.3UV HIGHtoday, daily maxSPF 30-50, a hat and sunglasses are a must. Betterstay in shade between 11:00 and 15:00.Unprotected fair skin may burn in about 30 min6Sat5.096Sun6.096Mon7.096Tue8.096Wed9.096Thu10.096Fri11.096Sat12.094Sun13.096Mon14.095Tue15.095Wed16.096Thu17.096Fri18.096Sat19.096Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Istanbul is 6 (high) - unprotected fair skin can burn in about 30 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.

Pollen in Istanbul - info for allergy sufferers

PLANT POLLEN · 4-DAY FORECASTIstanbulHighest pollen today: Ragweed20 grains/m³ · moderate leveltoday5.09tomorrow6.09Mon7.09Tue8.09Grasses-111Mugwort2345Ragweed201318-nonelowmoderatehighvery highoff season: alder, birch, olive · values in grains/m³ (daily peak)pogodapodroze.pl · 2026-09-05
Today ragweed pollen is highest in Istanbul - about 20 grains/m³, moderate level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.

Sea temperature - Istanbul

Water today
26°C
Week avg
25°C
Waves today
0 m
How's the water?
warm
16-day sea temperature forecast:
5.09 26°C6.09 26°C7.09 26°C8.09 25°C9.09 25°C10.09 25°C11.09 26°C12.09 25°C13.09 24°C
Average sea temperature through the year:
Jan 11°CFeb 9°CMar 10°CApr 12°CMay 15°CJun 21°CJul 25°CAug 25°CSep 24°COct 20°CNov 17°CDec 13°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Istanbul weather through the year

Istanbul - annual climate

Warmest, driest months on average: February, March, April, May.

Upcoming public holidays in Turkey: Republic Day — 29 October · New Year's Day — 1 January · Eid al-Fitr — 9 – 11 March. Full calendar and travel notes

Nearby and related places

BursaEskişehirKayseriGaziantepKonyaSamsunDiyarbakir

FAQ - Istanbul weather

What is the weather like in Istanbul today?
Today it is about 29° during the day and 24° at night, clear sky.
How far ahead can I check the forecast for Istanbul?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.