Sofia weather in September
September in Sofia: nice, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Sofia · #6 of 604 destinations to visit in September · comfort 95/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Sofia climate normals — September
| Daytime high | 23°C / 73°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 30 mm / 1.2 in | 🌦 some rain |
| Rainy days | 5 days | |
| Humidity | 68% | 💧 humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 12.5 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sofia in September — FAQ
- Is September a good time to visit Sofia?
- September in Sofia: nice, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Sofia on SeasonMap's comfort score (95/100).
- What is the weather like in Sofia in September?
- In September, Sofia averages a daily high of 23°C and a low of 12.8°C, with about 30.1 mm of rain over roughly 4.8 rainy days.
- What is the air quality in Sofia in September?
- Sofia has a mean US Air Quality Index of about 39 in September.