Climate averages 1991–2020
Istanbul weather
in April.
A cool, moderately wet month: the 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a cool month in Istanbul: daytime highs average 14.9°C and nights cool to about 8.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 47 mm of rain on roughly 8 days, which makes April a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 17 min on an average April day.
The nearest other city in this atlas is Üsküdar (5 km away). In April its highs average 15.1°C, about as warm as Istanbul, with 47 mm of rain.
Among the 138 cities listed in Turkey, Istanbul ranks 113th of 138 for the warmest April highs and joint 31st of 138 for the driest April (rainfall, lowest first). The mean April high of those 138 cities is 17.3°C; Istanbul is 2.4°C cooler than that mean.
From April to May, average highs rise by 5.0°C to 19.8°C, and monthly rainfall falls from 47 mm to 35 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Istanbul climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.2°C4.2°C | 4.2°C | 85 | 12.4 | 9.610 h |
| February | 8.7°C4.1°C | 4.1°C | 70 | 11.7 | 10.611 h |
| March | 10.8°C5.6°C | 5.6°C | 72 | 10.6 | 11.912 h |
| April, selected | 14.9°C8.8°C | 8.8°C | 47 | 8.1 | 13.313 h |
| May | 19.8°C13.6°C | 13.6°C | 35 | 6.1 | 14.514 h |
| June | 24.7°C18.4°C | 18.4°C | 32 | 5.4 | 15.115 h |
| July | 27.5°C21.1°C | 21.1°C | 23 | 3.4 | 14.815 h |
| August | 27.8°C21.8°C | 21.8°C | 20 | 3.2 | 13.814 h |
| September | 23.9°C18.5°C | 18.5°C | 46 | 6.4 | 12.513 h |
| October | 19.1°C14.5°C | 14.5°C | 75 | 9.0 | 11.111 h |
| November | 14.3°C10.1°C | 10.1°C | 72 | 9.6 | 9.910 h |
| December | 10.1°C6.4°C | 6.4°C | 99 | 12.8 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Üsküdar in AprilTurkey · 5 kmHigh 15.1°C · Low 8.6°C · 47 mm rain
- Şişli in AprilTurkey · 6 kmHigh 15.4°C · Low 8.1°C · 47 mm rain
- Sultangazi in AprilTurkey · 12 kmHigh 15.1°C · Low 7.9°C · 39 mm rain
- Ümraniye in AprilTurkey · 15 kmHigh 14.7°C · Low 8.2°C · 47 mm rain
- Küçükçekmece in AprilTurkey · 15 kmHigh 14.5°C · Low 8.7°C · 39 mm rain
- Başakşehir in AprilTurkey · 17 kmHigh 14.8°C · Low 8.0°C · 39 mm rain
- Esenyurt in AprilTurkey · 23 kmHigh 14.2°C · Low 8.7°C · 39 mm rain
- Sancaktepe in AprilTurkey · 24 kmHigh 15.2°C · Low 8.4°C · 48 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Istanbul) is explained once on the Istanbul year overview and on the Sources, method and limits page.
Ümraniye, Üsküdar and Şişli lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.