Mostar climate — normals and trends
Mostar (Bosnia and Herzegovina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.1 °C and it receives 1,565 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.3 °C on average) and the coldest is January (2.1 °C). Rainfall peaks in November.
Mostar averages 68 frost days, 28 hot days (≥ 30 °C) and 133 rainy days per year.
Mostar has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 89 to 47 per year over the period.
The hottest day of the period reached 40.5 °C (on 10 August 2017) and the coldest -23.0 °C (on 13 January 1985).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
MostarFederation of Bosnia and Herzegovina
- coords
- 43.34°, 17.81°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.1°C
Average daily high
17.2°C
Average daily low
7.1°C
Annual rainfall
1,565mm
Sunshine / day
9.5h
Mean relative humidity
72%
Average peak wind
10.5km/h
Seasonal range
20.2°C
Frost days (< 0 °C)
68 d/yr
Hot days (≥ 30 °C)
28 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
64.1 cm
Average feels-like high
16.2 °C
Average feels-like low
5.3 °C
Average peak gust
32.8 km/h
Tropical nights (≥ 20 °C)
3 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.63 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.5 °C
10 August 2017
Coldest day
-23.0 °C
13 January 1985
Wettest day
132 mm
2 October 2000
Windiest day
35.5 km/h
13 December 1957
Strongest gust
131.8 km/h
13 December 1957
Hottest feels-like
41.6 °C
17 July 2024
Coldest feels-like
-28.3 °C
24 January 1942
Snowiest day
23.2 cm
11 February 1944
Sunniest day
14.6 h
14 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 10.4 °C | +4.2 °C | 111 mm | -33 mm |
| Feb | 10.5 °C | +2.4 °C | 106 mm | -43 mm |
| Mar | 15.0 °C | +3.2 °C | 370 mm | +229 mm |
| Apr | 18.4 °C | +2.4 °C | 85 mm | -55 mm |
| May | 21.5 °C | +0.7 °C | 98 mm | -17 mm |
| Jun | 31.5 °C | +6.5 °C | 4 mm | -71 mm |
| Jul | 31.5 °C | +3.2 °C | 70 mm | +27 mm |
| Aug | 30.7 °C | +2.1 °C | 122 mm | +64 mm |
| Sep | 26.3 °C | +2.5 °C | 105 mm | -12 mm |
| Oct | 17.4 °C | -0.8 °C | 93 mm | -80 mm |
| Nov | 13.7 °C | +1.6 °C | 234 mm | +8 mm |
| Dec | 10.6 °C | +3.0 °C | 60 mm | -125 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Mostar?
Mostar has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.1 °C and it receives 1,565 mm of precipitation per year.
What is the hottest day ever recorded in Mostar?
The hottest day measured in Mostar between 1940 and 2025 was 10 August 2017, reaching 40.5 °C.
What is the coldest day in Mostar?
The coldest day measured in Mostar between 1940 and 2025 was 13 January 1985, at -23.0 °C.
Does it snow in Mostar?
Yes. Mostar gets on average 64.1 cm of snow per year and has around 68 frost days.
Has the climate of Mostar warmed?
Yes: Mostar warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mostar?
The wettest day measured in Mostar between 1940 and 2025 was 2 October 2000, with 132 mm of rain in 24 hours.
What was the windiest day in Mostar?
The windiest day measured in Mostar between 1940 and 2025 was 13 December 1957, with winds reaching 35.5 km/h.
What is the warmest month in Mostar?
The warmest month in Mostar is July (22.3 °C on average); the coldest is January (2.1 °C).
How much does it rain in Mostar?
Mostar receives on average 1,565 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Mostar?
Mostar gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mostar?
The heaviest 24-hour snowfall measured in Mostar between 1940 and 2025 was 11 February 1944, with 23.2 cm.
Are there tropical nights in Mostar?
Yes: Mostar has on average 3 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Mostar?
In Mostar, between 1940 and 2025, the highest apparent temperature reached 41.6 °C on 17 July 2024, and the lowest was -28.3 °C on 24 January 1942.
Compare Mostar with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mostar