Ljubljana, Slovenia climate

Cfb Oceanic / temperate

Ljubljana has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 28°C, while the coldest is January averaging around −2°C at night. Around 1364 mm of precipitation falls each year, peaking in September (153 mm) and easing off in January (65 mm).

☀️ Summers

Warm

Highs near 28°C in July.

About 12 days a year above 32 °C

❄️ Winters

Cold

Lows near −2°C in January.

About 77 freezing nights a year

🌧️ Rain

Wet

About 1364 mm of rain a year.

Wettest in September

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.2 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Ljubljana climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	4	7	12	17	22	26	28	28	22	16	10	4
Avg temp (°C)	1	3	7	12	16	20	22	22	17	12	7	2
Avg low (°C)	−2	−1	2	6	11	14	16	16	12	8	4	−1
Precipitation (mm)	65	85	83	96	116	124	121	131	153	148	139	104

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	4	7	12	17	22	26
Avg temp (°C)	1	3	7	12	16	20
Avg low (°C)	−2	−1	2	6	11	14
Precipitation (mm)	65	85	83	96	116	124

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	28	28	22	16	10	4
Avg temp (°C)	22	22	17	12	7	2
Avg low (°C)	16	16	12	8	4	−1
Precipitation (mm)	121	131	153	148	139	104

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	10	12	13	12	12	11	12	12	14	12
Days with high ≥ 32°C (days)	—	—	—	—	0.1	2	5	5	0.0	—	—	—
Days with low ≤ 0°C (days)	22	18	9	1	—	—	—	—	—	1	7	19

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	9	10	12	13	12
Days with high ≥ 32°C (days)	—	—	—	—	0.1	2
Days with low ≤ 0°C (days)	22	18	9	1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	12	11	12	12	14	12
Days with high ≥ 32°C (days)	5	5	0.0	—	—	—
Days with low ≤ 0°C (days)	—	—	—	1	7	19

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	65	65	65	67	66	64	58	55	62	65	70	67
Clear days (≤ 30% cloud)	4	5	4	5	4	5	6	8	6	5	3	4
Partly cloudy days (30–70%)	12	8	11	9	12	11	12	12	10	10	10	11
Cloudy days (≥ 70%)	15	15	16	16	16	14	13	11	14	16	17	16
Relative humidity (%)	91	87	82	78	77	75	72	70	77	85	90	91
Wind speed (m/s)	0.4	0.5	0.4	0.2	0.1	0.1	0.2	0.2	0.2	0.1	0.1	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	65	65	65	67	66	64
Clear days (≤ 30% cloud)	4	5	4	5	4	5
Partly cloudy days (30–70%)	12	8	11	9	12	11
Cloudy days (≥ 70%)	15	15	16	16	16	14
Relative humidity (%)	91	87	82	78	77	75
Wind speed (m/s)	0.4	0.5	0.4	0.2	0.1	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	58	55	62	65	70	67
Clear days (≤ 30% cloud)	6	8	6	5	3	4
Partly cloudy days (30–70%)	12	12	10	10	10	11
Cloudy days (≥ 70%)	13	11	14	16	17	16
Relative humidity (%)	72	70	77	85	90	91
Wind speed (m/s)	0.2	0.2	0.2	0.1	0.1	0.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ljubljana Bezigrad, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →