Istanbul weather in December
December in Istanbul: cool, a little rain, with very humid — a good time to visit.
#10 of 12 months in Istanbul · #325 of 604 destinations to visit in December · comfort 68/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Istanbul climate normals — December
| Daytime high | 13°C / 55°F | 🙂 cool |
|---|---|---|
| Nighttime low | 9°C / 47°F | |
| Feels like (high) | 10°C / 50°F | |
| Rainfall | 69 mm / 2.7 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 7°C / 45°F | |
| Sunshine | 5.7 h/day | |
| Daylight | 9.3 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 54 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Istanbul in December — FAQ
- Is December a good time to visit Istanbul?
- December in Istanbul: cool, a little rain, with very humid — a good time to visit. It ranks #10 of 12 months for Istanbul on SeasonMap's comfort score (68/100).
- What is the weather like in Istanbul in December?
- In December, Istanbul averages a daily high of 12.5°C and a low of 8.5°C, with about 69.1 mm of rain over roughly 11.6 rainy days.
- What is the air quality in Istanbul in December?
- Istanbul has a mean US Air Quality Index of about 54 in December.