Istanbul in April
In April, Istanbul has 48.3 mm (1.90 in) of rain, a daily high of 16.7 °C (62.1 °F) and a daily low of 8.5 °C (47.3 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.
Last updated : back, with ERA5-Land model estimates.
Best time to visit Istanbul: April meets our rule. Expect 6.4 rain days (model estimate) and days that grow by 1 h 15 min.
What April is like in Istanbul
- Tulips open by the millions every April, in a riot of colours. They fill Gülhane Park, Emirgan Grove, Fethipaşa Grove and Soğanlı Botanical Park. Source: Go Türkiye (Türkiye Tourism Promotion and Development Agency), checked .
- Threads knotted onto trees line the forest path to Aya Yorgi Church on Büyükada in late April. Climbers tie them as they go, then light a candle inside and make a wish. Source: DHA (Demirören News Agency), checked .
- Hundreds of white storks fly past the Sarıyer Feneryolu bird tower in spring. It sits north of the city, on the path of birds of prey. Source: Birdingplaces, checked .
Key figures
Weather in April, 1991-2020 model estimates
- Daily high
- 16.7 °C (62.1 °F)
- Daily low
- 8.5 °C (47.3 °F)
- Rain
- 48.3 mm (1.90 in) in the month
- Sunshine
- no data
Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked . How we make and test model estimates
Model estimate for the ERA5-Land grid cell at 41.0° N, 29.0° E, 4 km from the city centre point.
How we define and convert these figures
Notes. Sunshine: Not in our ERA5-Land estimates.
Daylight on 15 April 2026
- Sunrise
- 06:25 local time
- Sunset
- 19:44 local time
- Day length
- 13 h 18 min
Day length 1-30 April: 12 h 41 min to 13 h 56 min, +1 h 15 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.
ERA5-Land model estimates 1991-2020, as above, checked .
This month against the year
| Measure | April | Rank |
|---|---|---|
| Daily high | 16.7 °C | 6th coldest |
| Daily low | 8.5 °C | 5th coldest |
| Rain | 48.3 mm | 5th driest |
| Sunshine | no data | no data |
| Day length | 13 h 18 min | 5th longest |
Equal values share a rank. How we rank months
Istanbul in April, on average: 6.4 rain days (1 mm or more). Model estimate, adjusted against station records.
ERA5-Land model estimates 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
| Date | Holiday |
|---|---|
| Thursday | National Sovereignty and Children's Day |
| Date | Holiday |
|---|---|
| Friday | National Sovereignty and Children's Day |
Typed from the official lists for 2026 and 2027 and re-checked, .
English names are from the holidays library where the official list gives none. How we check holidays
Source: Official public holiday list (vakithesaplama.diyanet.gov.tr) for 2026 and 2027, checked ; holidays Python library, checked . Library: holidays 0.105.
Same month in 8 model-estimate cities
Istanbul is the coolest of our 8 model-estimate cities in April by mean daily high. How we rank cities
Closest high and low in April: Porto (1.9 °C apart), Melbourne (3.4), Lisbon (3.6).
| City | Gap from Istanbul, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Istanbul (this page) | — | 16.7 | 8.5 | 48.3 | no data |
| Porto (closest) | 1.9 | 19.2 | 9.8 | 115.1 | no data |
| Melbourne (closest) | 3.4 | 21.1 | 10.8 | 52.0 | no data |
| Lisbon (closest) | 3.6 | 19.8 | 12.6 | 54.7 | no data |
| Sydney | 7.0 | 23.4 | 15.7 | 71.6 | no data |
| Mumbai | 16.6 | 34.2 | 24.2 | no data | no data |
| Delhi | 16.7 | 37.8 | 20.8 | no data | no data |
| Bangkok | 18.8 | 35.8 | 26.9 | no data | no data |
Sources (1991-2020): ERA5-Land model estimates, checked . Each city's page names its grid cell. All sources in full on Methodology.
Sources
- Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Official sources
Cite this page: City by Month. "Istanbul in April: weather, daylight, holidays". https://citybymonth.com/cities/turkey/istanbul/april/. Last updated 8 November 2026.