Warsaw weather in September
September in Warsaw: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Warsaw · #236 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Warsaw climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 52°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 51 mm / 2 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 8.4 h/day | |
| Daylight | 12.6 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Warsaw?
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Warsaw in September — FAQ
- Is September a good time to visit Warsaw?
- September in Warsaw: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Warsaw on SeasonMap's comfort score (84/100).
- What is the weather like in Warsaw in September?
- In September, Warsaw averages a daily high of 19.4°C and a low of 11.1°C, with about 50.8 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Warsaw in September?
- Warsaw has a mean US Air Quality Index of about 47 in September.