Cluj-Napoca weather in September
September in Cluj-Napoca: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Cluj-Napoca · #289 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cluj-Napoca in September
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Cluj-Napoca climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 52°F | |
| Rainfall | 76 mm / 3 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 9.4 h/day | |
| Daylight | 12.5 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cluj-Napoca in September — FAQ
- Is September a good time to visit Cluj-Napoca?
- September in Cluj-Napoca: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Cluj-Napoca on SeasonMap's comfort score (87/100).
- What is the weather like in Cluj-Napoca in September?
- In September, Cluj-Napoca averages a daily high of 20.8°C and a low of 10.9°C, with about 75.5 mm of rain over roughly 10.8 rainy days.
- What is the air quality in Cluj-Napoca in September?
- Cluj-Napoca has a mean US Air Quality Index of about 37 in September.