Avg High
Istanbul in August
Avg Low
Rain
Daylight
14h
What to expect
August in Istanbul is late summer, with a settled seasonal pattern already in place. It can feel distinctly hot through the middle of the day, with a noticeable cool-down after sunset. Most days feel close to what the averages suggest, with straightforward pacing. There is plenty of daylight to stretch outdoor time.
August in context
How it compares to the rest of the year in Istanbul.
Hottest (avg)
#1 / 12
Wettest (avg)
#11 / 12
Daylight Hours
#4 / 12
Windiest (avg)
#4 / 12
Highest UV
#4 / 12
Most Humid
#11 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 13.8 h
- UV index (max)
- 7
- Typical sun hours
- 06:14 - 20:01
Rain & Snow
- Total rain
-
- Rainy days
- 6 days
- Cloud cover (avg)
- 21%
Humidity & Wind
- Humidity (avg)
- 70%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for August. Typical high 28.6°C and low 21.8°C.
Typical disruptions in August
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in August.
Humidity High impact
Muggy days Measures: Muggy days (dew point >=20C). Observed about 29% of days (9.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
9.0 days / month
~29% of days
Why this matters
- Expected days 9.0 days / month
- Probability ~29% of days
- Intensity Up to ~23°C (P95)
Muggy conditions are possible on ~9 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat High impact
Hot days Measures: Hot days (>=30C). Observed about 24% of days (7.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
7.5 days / month
~24% of days
Why this matters
- Expected days 7.5 days / month
- Probability ~24% of days
- Intensity Up to ~34°C (P95)
Hot days are possible on ~8 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 21% of days (6.6 days/month) in August. Historical risk signal only, not a day-by-day forecast.
6.6 days / month
~21% of days
Why this matters
- Expected days 6.6 days / month
- Probability ~21% of days
- Intensity Up to ~36°C (P95)
Feels-like heat >=32C is possible on ~7 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Very hot feels-like Measures: Very hot feels-like days (>=35C). Observed about 4% of days (1.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
~4% of days
Why this matters
- Expected days 1.3 days / month
- Probability ~4% of days
- Intensity Up to ~38°C (P95)
Very hot feels-like conditions are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 4% of days (1.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
~4% of days
Why this matters
- Expected days 1.3 days / month
- Probability ~4% of days
- Intensity Up to ~25mm (P95)
Washout conditions are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 3% of days (0.9 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.9 days / month
~3% of days
Why this matters
- Expected days 0.9 days / month
- Probability ~3% of days
- Intensity Up to ~70km/h (P95)
Strong gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Show all disruptions (20 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 2% of days (0.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~2% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~2% of days
- Intensity Up to ~32mm (P95)
Heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.2 days/month in August. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
Probability unavailable
Why this matters
- Expected days 0.2 days / month
- Probability —
- Intensity Up to ~21mm (P95)
Multi-day washout runs are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~63km/h (P95)
Stormy conditions are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 4% of days (1.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
~4% of days
Why this matters
- Expected days 1.3 days / month
- Probability ~4% of days
- Intensity Up to ~25mm (P95)
Rain disruption risk appears on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Heat Moderate
Heat stress risk Measures: High heat stress days. Observed about 4% of days (1.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.2 days / month
~4% of days
Why this matters
- Expected days 1.2 days / month
- Probability ~4% of days
- Intensity Up to ~38°C (P95)
Heat stress is possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 62% of days (19.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
19.4 days / month
~62% of days
Why this matters
- Expected days 19.4 days / month
- Probability ~62% of days
- Intensity Up to ~22°C (P95)
Humid conditions are possible on ~19 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 50% of days (15.6 days/month) in August. Historical risk signal only, not a day-by-day forecast.
15.6 days / month
~50% of days
Why this matters
- Expected days 15.6 days / month
- Probability ~50% of days
- Intensity Up to ~25°C (P95)
Warm nights are possible on ~16 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 49% of days (15.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
15.3 days / month
~49% of days
Why this matters
- Expected days 15.3 days / month
- Probability ~49% of days
- Intensity Up to ~61km/h (P95)
Gusty conditions are possible on ~15 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 27% of days (8.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
8.4 days / month
~27% of days
Why this matters
- Expected days 8.4 days / month
- Probability ~27% of days
- Intensity Up to ~10mm (P95)
Measurable rain is possible on ~8 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 17% of days (5.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
5.4 days / month
~17% of days
Why this matters
- Expected days 5.4 days / month
- Probability ~17% of days
- Intensity Up to ~18h (P95)
Several rainy hours are possible on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 9% of days (2.9 days/month) in August. Historical risk signal only, not a day-by-day forecast.
2.9 days / month
~9% of days
Why this matters
- Expected days 2.9 days / month
- Probability ~9% of days
- Intensity Up to ~20h (P95)
Wet-most-of-day conditions are possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 7% of days (2.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
2.2 days / month
~7% of days
Why this matters
- Expected days 2.2 days / month
- Probability ~7% of days
- Intensity Up to ~31km/h (P95)
Breezy conditions are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 7% of days (2.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
2.0 days / month
~7% of days
Why this matters
- Expected days 2.0 days / month
- Probability ~7% of days
- Intensity Up to ~87% (P95)
High humidity is possible on ~2 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 6% of days (1.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.8 days / month
~6% of days
Why this matters
- Expected days 1.8 days / month
- Probability ~6% of days
- Intensity Up to ~94% (P95)
Cloudy skies are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.8 days/month in August. Historical risk signal only, not a day-by-day forecast.
0.8 days / month
Probability unavailable
Why this matters
- Expected days 0.8 days / month
- Probability —
- Intensity Up to ~36°C (P95)
Feels-like heatwave runs are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Heatwave run Measures: Heatwave runs (>=3 hot days). Observed about 0.8 days/month in August. Historical risk signal only, not a day-by-day forecast.
0.8 days / month
Probability unavailable
Why this matters
- Expected days 0.8 days / month
- Probability —
- Intensity Up to ~33°C (P95)
Heatwave runs are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Humidity Minor
Convective risk Measures: Convective storm risk proxy. Observed about 2% of days (0.7 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.7 days / month
~2% of days
Why this matters
- Expected days 0.7 days / month
- Probability ~2% of days
- Intensity Up to ~21°C (P95)
Convective risk signal appears on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 1% of days (0.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~97% (P95)
Mostly cloudy skies are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Hot nights Measures: Hot nights (min >=25C). Observed about 1% of days (0.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~26°C (P95)
Hot nights are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Very hot days Measures: Very hot days (>=35C). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~37°C (P95)
Very hot days are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Frequently asked questions
Is August a good time to visit Istanbul?
Typical August days in Istanbul reach highs of 28°C (82°F) with nights around 22°C (72°F). It usually feels hot by day and mild after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
Daytime temperatures in August typically peak near 28°C (82°F), while nights drop to around 22°C (72°F). Expect hot afternoons and mild evenings.
How much does it rain in August?
Rainfall in August averages 21 mm (0.83 in) across roughly 6 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 14 hours of daylight in August. Sunrise is typically around 06:14 and sunset near 20:01. You get long days with comfortable amounts of daylight.
How strong is the sun in August?
UV levels are often high (around 7). Regular sunscreen and a hat are recommended.
Is it windy in August?
In August, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 53 km/h (33 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.