Climate averages 1991–2020
Mostar weather
in September.
A warm, wet month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Mostar: daytime highs average 24.2°C and nights cool to about 13.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 135 mm of rain on roughly 9 days, which makes September a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 33 min on an average September day.
The nearest other city in this atlas is Ilidža (68 km away). In September its highs average 21.1°C, 3.1°C cooler than Mostar, with 91 mm of rain.
Among the 7 cities listed in Bosnia and Herzegovina, Mostar ranks 1st of 7 for the warmest September highs and 7th of 7 for the driest September (rainfall, lowest first). The mean September high of those 7 cities is 22.0°C; Mostar is 2.2°C warmer than that mean.
From September to October, average highs fall by 5.1°C to 19.2°C, and monthly rainfall rises from 135 mm to 180 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mostar climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.1°C-0.2°C | -0.2°C | 138 | 11.1 | 9.49 h |
| February | 9.3°C0.0°C | 0.0°C | 136 | 11.0 | 10.510 h |
| March | 13.1°C3.0°C | 3.0°C | 133 | 11.7 | 11.912 h |
| April | 17.4°C6.7°C | 6.7°C | 147 | 13.1 | 13.413 h |
| May | 22.1°C11.1°C | 11.1°C | 109 | 12.4 | 14.715 h |
| June | 26.5°C15.1°C | 15.1°C | 72 | 9.7 | 15.315 h |
| July | 29.6°C17.5°C | 17.5°C | 45 | 6.8 | 15.115 h |
| August | 30.2°C17.9°C | 17.9°C | 53 | 6.6 | 14.014 h |
| September, selected | 24.2°C13.8°C | 13.8°C | 135 | 9.1 | 12.513 h |
| October | 19.2°C9.6°C | 9.6°C | 180 | 10.8 | 11.111 h |
| November | 13.8°C5.5°C | 5.5°C | 222 | 13.2 | 9.710 h |
| December | 9.0°C1.0°C | 1.0°C | 191 | 12.5 | 9.09 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Ilidža in SeptemberBosnia and Herzegovina · 68 kmHigh 21.1°C · Low 12.0°C · 91 mm rain
- Sarajevo in SeptemberBosnia and Herzegovina · 71 kmHigh 21.1°C · Low 11.7°C · 91 mm rain
- Zenica in SeptemberBosnia and Herzegovina · 96 kmHigh 21.9°C · Low 12.5°C · 94 mm rain
- Split in SeptemberCroatia · 112 kmHigh 24.2°C · Low 16.6°C · 103 mm rain
- Tuzla in SeptemberBosnia and Herzegovina · 150 kmHigh 22.1°C · Low 12.3°C · 86 mm rain
- Podgorica in SeptemberMontenegro · 155 kmHigh 24.4°C · Low 15.9°C · 164 mm rain
- Banja Luka in SeptemberBosnia and Herzegovina · 167 kmHigh 22.2°C · Low 12.0°C · 95 mm rain
- Shkodër in SeptemberAlbania · 199 kmHigh 24.6°C · Low 17.4°C · 181 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mostar) is explained once on the Mostar year overview and on the Sources, method and limits page.