Istanbul weather by month
Istanbul runs from about 7°C in January to 26°C in July, with December the wettest month at 147 mm.
warmest month
July
26°C
coolest month
January
7°C
wettest month
December
147 mm
worst air month
December
43 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 7°C | 113 mm | 162 h | 32 |
| February | 9°C | 29 mm | 198 h | 29 |
| March | 10°C | 71 mm | 240 h | 29 |
| April | 15°C | 67 mm | 295 h | 22 |
| May | 16°C | 84 mm | 342 h | 18 |
| June | 25°C | 10 mm | 416 h | 12 |
| July | 26°C | 37 mm | 420 h | 12 |
| August | 25°C | 14 mm | 396 h | 12 |
| September | 22°C | 94 mm | 308 h | 11 |
| October | 16°C | 11 mm | 277 h | 22 |
| November | 11°C | 75 mm | 198 h | 34 |
| December | 9°C | 147 mm | 146 h | 43 |
About 3,398 hours of sun a year. Roughly 75 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.