Mostar weather in September
September in Mostar: warm, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Mostar · #172 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Mostar climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 121 mm / 4.7 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 12.5 h | |
| Wind | 11 km/h / 7 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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Mostar in September — FAQ
- Is September a good time to visit Mostar?
- September in Mostar: warm, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Mostar on SeasonMap's comfort score (86/100).
- What is the weather like in Mostar in September?
- In September, Mostar averages a daily high of 25.9°C and a low of 15.2°C, with about 120.6 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Mostar in September?
- Mostar has a mean US Air Quality Index of about 39 in September.