Ljubljana climate

Name: Ljubljana
Address: SI

Ljubljana is warmest in July, with average highs of 25 °C, and coldest in January, when nights average -3.1 °C. September is the wettest month (127 mm) and January the driest (60 mm). Figures are 1991–2020 climate normals.

Across a full year Ljubljana averages 1,175 mm of rain, 47 days above 25 °C and 86 days below freezing.

Slovenia · population 272,220 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 25 °C
Coldest month January -3.1 °C
Driest month January 60 mm
Wettest month September 127 mm
Least cloud July 49 % cloud
Hottest on record August 37 °C
Coldest on record December -24 °C

What to expectLjubljana through the year

Ljubljana has a clear annual cycle: average daily highs run from 3.7 °C in January to 25 °C in July, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 47 days a year reach 25 °C, 8 of them reach 30 °C, 86 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in August.

Rain is strongly seasonal. September averages 127 mm against 60 mm in January — 2.1 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	3.7 °C	60 mm	70 %
February	5.8 °C	76 mm	65 %
March	10.4 °C	77 mm	62 %
April	15.2 °C	89 mm	61 %
May	19.3 °C	101 mm	60 %
June	23.2 °C	104 mm	56 %
July	25.4 °C	96 mm	49 %
August	25.3 °C	112 mm	50 %
September	19.9 °C	127 mm	60 %
October	14.7 °C	118 mm	69 %
November	9.2 °C	124 mm	76 %
December	4.3 °C	92 mm	71 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	3.7 °C	-3.1 °C	0.1 °C	13.2 °C	-22.8 °C	0	0	24
February	5.8 °C	-2.6 °C	1.4 °C	17.7 °C	-18.1 °C	0	0	20
March	10.4 °C	1.0 °C	5.6 °C	21.8 °C	-20.9 °C	0	0	10
April	15.2 °C	5.0 °C	10.2 °C	24.7 °C	-5.5 °C	0	0	2
May	19.3 °C	9.5 °C	14.6 °C	29.4 °C	-2.1 °C	2	0	0
June	23.2 °C	13.4 °C	18.5 °C	35.0 °C	4.8 °C	10	1	0
July	25.4 °C	15.5 °C	20.7 °C	34.3 °C	7.8 °C	17	3	0
August	25.3 °C	15.6 °C	20.5 °C	37.2 °C	5.3 °C	16	4	0
September	19.9 °C	11.3 °C	15.5 °C	29.3 °C	1.3 °C	3	0	0
October	14.7 °C	7.0 °C	10.7 °C	24.6 °C	-5.4 °C	0	0	1
November	9.2 °C	2.9 °C	5.9 °C	20.4 °C	-12.7 °C	0	0	8
December	4.3 °C	-2.2 °C	0.9 °C	14.3 °C	-24.5 °C	0	0	21

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	60 mm	8	9.0 h/day	70 %	83 %	11 km/h
February	76 mm	8	10 h/day	65 %	78 %	12 km/h
March	77 mm	10	12 h/day	62 %	75 %	14 km/h
April	89 mm	12	14 h/day	61 %	74 %	13 km/h
May	101 mm	13	15 h/day	60 %	76 %	12 km/h
June	104 mm	13	16 h/day	56 %	76 %	11 km/h
July	96 mm	11	15 h/day	49 %	74 %	11 km/h
August	112 mm	11	14 h/day	50 %	74 %	10 km/h
September	127 mm	11	13 h/day	60 %	80 %	11 km/h
October	118 mm	10	11 h/day	69 %	84 %	12 km/h
November	124 mm	11	9.5 h/day	76 %	86 %	11 km/h
December	92 mm	9	8.7 h/day	71 %	85 %	10 km/h

How Ljubljana compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Ljubljana	25 °C	-3.1 °C	1,175 mm	47
Trieste · Italy	28 °C	1.2 °C	1,489 mm	72
Zagreb · Croatia	27 °C	-2.4 °C	882 mm	72
Graz · Austria	24 °C	-5.3 °C	774 mm	38
Padua · Italy	29 °C	-0.3 °C	979 mm	88

Planning a trip? See the best time to visit Ljubljana.

QuestionsCommon questions about Ljubljana’s climate

When is the best time to visit Ljubljana?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and January the driest. The month-by-month table above has the full picture.

How hot does Ljubljana get?

In July, the warmest month, daily highs average 25 °C. About 8 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average -3.1 °C in January, the coldest month. A normal year has 86 nights below freezing.

Which month is wettest in Ljubljana?

September, averaging 127 mm over 11 days with rain. The driest month is January with 60 mm. The year as a whole averages 1,175 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Ljubljana rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 46.051°, 14.505° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.