İstilli, Turkey experiences average highs of 19°C (66°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 0.7°C (1.3°F) across the available records.
İstilli, Turkey Weather & Climate 2026
Monthly climate averages for İstilli, Turkey. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Nov 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.4/10
Best: June, July, August, September, October
UV Index
5
Low
Temperature 19°C / 9°C
Feels Like 19°C / 8°C
Rainy Days 12
Rainfall 93 mm
Sunshine 9 h
Humidity 83%
Wind Speed 9 km/h
Dew Point 11°C
Snow Days 7 days
Frost Days 7 days
Hottest Month
28°C
August
Avg Low 18°C
Rain 7 days
Coldest Month
0°C
January
Avg High 9°C
Rain 15 days
Driest Month
7 days
July
Avg High 27°C
Avg Low 17°C
Windiest Month
10 km/h
August (Gusts 33)
Worst Time to Visit
Consider avoiding January due to heavy rainfall.
Sun Position
Sunrise 05:37
Daylight 14.8h
Sunset 20:26
Live conditions —
İstilli on the map · live conditions
İstilli, Turkey
- Continent
- Asia
- Country
- Turkey
- City
- İstilli
- Population
- 620
- Coordinates
- 40.83°, 31.09°
Seasonal Breakdown
Spring
Mar–May
Avg High 18°C
Avg Low 7°C
Rain 14 days/mo
Summer
Jun–Aug
Avg High 27°C
Avg Low 17°C
Rain 9 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 20°C
Avg Low 11°C
Rain 10 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 10°C
Avg Low 1°C
Rain 14 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 9°C / 0°C . Feb: 11°C / 1°C . Mar: 14°C / 3°C . Apr: 18°C / 7°C . May: 21°C / 11°C . Jun: 25°C / 16°C . Jul: 27°C / 17°C . Aug: 28°C / 18°C . Sep: 25°C / 15°C . Oct: 20°C / 11°C . Nov: 16°C / 7°C . Dec: 11°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 118 mm. Feb: 98 mm. Mar: 114 mm. Apr: 101 mm. May: 120 mm. Jun: 95 mm. Jul: 61 mm. Aug: 45 mm. Sep: 66 mm. Oct: 87 mm. Nov: 91 mm. Dec: 119 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 84%. Mar: 82%. Apr: 82%. May: 83%. Jun: 83%. Jul: 81%. Aug: 81%. Sep: 82%. Oct: 85%. Nov: 83%. Dec: 86%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 9 km/h . Feb: 9 km/h . Mar: 9 km/h . Apr: 9 km/h . May: 8 km/h . Jun: 9 km/h . Jul: 10 km/h . Aug: 10 km/h . Sep: 9 km/h . Oct: 8 km/h . Nov: 9 km/h . Dec: 9 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 9h. Apr: 10h. May: 11h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 11h. Oct: 9h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow Days Snowfall
Snow Days: Jan: 12 days. Feb: 10 days. Mar: 8 days. Apr: 3 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 2 days. Dec: 9 days.
Climate Trends
Average highs have warmed by 0.7°C (1.3°F) across the available records. Average rainfall is trending drier by about 24 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 30°C | Aug · 28°C |
| Coldest month | Feb 2025 · -2°C | Jan · 0°C |
| Wettest month | Oct 2025 · 171 mm | May · 120 mm |
| Windiest month | Jul 2025 · 11 km/h | Aug · 10 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Excellent November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 0°C | 7°C / -3°C | 15days (118 mm) Wet | 6.1h Fair | 85% Humid | 2.1 Moderate | Poor | View Details |
| February | 11°C / 1°C | 9°C / -2°C | 13days (98 mm) Wet | 7.3h Good | 84% Humid | 3 Moderate | Poor | View Details |
| March | 14°C / 3°C | 13°C / 1°C | 14days (114 mm) Wet | 8.5h Good | 82% Humid | 4.5 Moderate | Fair | View Details |
| April | 18°C / 7°C | 18°C / 5°C | 13days (101 mm) Wet | 10h Excellent | 82% Humid | 5.5 High | Good | View Details |
| May | 21°C / 11°C | 23°C / 11°C | 16days (120 mm) Wet | 11.1h Excellent | 83% Humid | 6.4 High | Good | View Details |
| June best | 25°C / 16°C | 29°C / 17°C | 13days (95 mm) Wet | 12.7h Excellent | 83% Humid | 7.3 Very High | Excellent | View Details |
| July best | 27°C / 17°C | 31°C / 19°C | 7days (61 mm) Good | 13.2h Excellent | 81% Humid | 7.3 Very High | Excellent | View Details |
| August best | 28°C / 18°C | 32°C / 20°C | 7days (45 mm) Good | 12.1h Excellent | 81% Humid | 6.7 High | Excellent | View Details |
| September best | 25°C / 15°C | 27°C / 16°C | 9days (66 mm) Wet | 10.7h Excellent | 82% Humid | 5.4 High | Excellent | View Details |
| October best | 20°C / 11°C | 21°C / 10°C | 11days (87 mm) Wet | 8.6h Good | 85% Humid | 4 Moderate | Excellent | View Details |
| November | 16°C / 7°C | 15°C / 5°C | 10days (91 mm) Wet | 7.1h Good | 83% Humid | 2.5 Moderate | Fair | View Details |
| December | 11°C / 3°C | 10°C / 0°C | 15days (119 mm) Wet | 5.8h Fair | 86% Very Muggy | 1.9 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit İstilli are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for İstilli, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in İstilli is August, with average daytime highs of 28°C (82°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in İstilli is January, with average overnight lows of 0°C (32°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in İstilli is May, averaging 120mm of precipitation across 16 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in İstilli runs through May, January, December, March, with the heaviest rainfall in May. Based on 10-year averages for İstilli.
İstilli receives approximately 113 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for İstilli.
The least favorable months to visit İstilli are January, primarily due to heavy rainfall. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in İstilli is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in İstilli is 83%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes, İstilli receives snow. Months with snowfall average 7 snow days and 22 cm (9 in) of accumulation, with about 7 frost days during winter.
Average wind speeds in İstilli are 9 km/h (6 mph). The windiest month is August with peak winds reaching 10 km/h (6 mph) (gusts up to 33 km/h / 21 mph).
İstilli averages 4 clear-sky days per month with overall cloud cover around 59%. The clearest skies occur in July.
The annual average dew point in İstilli is 11°C (52°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
İstilli has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in İstilli ranges from 8°C (46°F) to 19°C (66°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, July is a great time to visit İstilli. It earns a climate score of 8.6/10 with Excellent.
For July in İstilli, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 27°C (81°F) and 7 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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