Slovenia climate

Monthly averages for Ljubljana, 2021–2025

In Ljubljana, the warmest month is July, with an average high of 28°C, and the coldest is January, when nights average −3°C.

About 1227 mm of rain falls in a year, on roughly 120 days. May is the wettest month (156 mm) and February the driest (59 mm).

Wind is strongest in April (6 km/h on average) and lightest in December (4 km/h).

Compared with Dublin, July afternoons are 9°C warmer, and January afternoons 2°C colder.

The hottest day in 2021–2025 reached 37.2°C (23 July 2022), and the coldest night fell to −17.5°C (21 January 2024).

Temperature

Bars run from the average night-time low to the average daytime high, in °C.

Average total rainfall each month, in millimetres.

Average wind speed at 10 metres each month, in km/h.

Ljubljana month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	6	−3	109	10	4.6	5
February	9	−2	59	6	6.4	6
March	13	0	92	10	8.5	6
April	15	4	86	9	9.2	6
May	20	9	156	16	10.0	6
June	27	14	66	9	12.8	6
July	28	16	102	10	12.6	5
August	27	15	85	10	11.6	5
September	22	11	138	10	9.5	5
October	17	7	126	9	7.3	5
November	10	2	123	11	5.0	4
December	6	−1	85	10	3.8	4