The best time to visit Ljubljana is May, June and September, when average highs sit in a comfortable range — from 19.4 °C in May to 25.8 °C in June and 21.8 °C in September — with generous sunshine and manageable rain days (11 in June, 12 in September). July and August are the warmest months but bring peak-season school-holiday crowds and busier streets around Ljubljana Castle. Winter, from December to February, is the quiet low season, with highs near 5–8 °C and short, cloudy days.
Best months MayJuneSeptember
Ljubljana month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 5.2 °C | -3.3 °C | 9 | 5 h |
| February | 8.3 °C | -1.4 °C | 9 | 5.9 h |
| March | 12.1 °C | 0.7 °C | 11 | 8.2 h |
| April | 16.2 °C | 4.5 °C | 10 | 9.7 h |
| May | 19.4 °C | 9.1 °C | 16 | 10.1 h |
| June | 25.8 °C | 14.4 °C | 11 | 12.4 h |
| July | 27.5 °C | 15.9 °C | 11 | 12.5 h |
| August | 27.2 °C | 15.7 °C | 9 | 11.6 h |
| September | 21.8 °C | 11.5 °C | 12 | 9.4 h |
| October | 16.9 °C | 7.2 °C | 10 | 7.3 h |
| November | 10 °C | 2.7 °C | 11 | 4.6 h |
| December | 5.7 °C | -1.6 °C | 9 | 4.3 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
Green, fresh and pleasant — ideal for walkers and sightseers who don't mind a spring shower.
Summer (Jun–Aug)
June is the sweet spot; July and August suit sun-lovers happy to share the city.
Autumn (Sep–Nov)
September is a top pick — warm, golden and far less crowded than summer.
Winter (Dec–Feb)
Worth it for Christmas-market charm, but chilly and short on daylight.
Notable events
- Summer (July–August)
- Ljubljana Festival (music, theatre and dance)
- December
- Ljubljana Christmas Market and festive lights
- October
- Ljubljana Marathon
- Fridays, spring through autumn
- Open Kitchen (Odprta kuhna) street-food market
Frequently asked
Is Ljubljana too hot in August?
August highs average 27.2 °C with 11.6 hours of sunshine — warm but rarely oppressive. The bigger drawback is the peak-season crowds; June, at 25.8 °C, offers similar warmth with fewer people.
What is the rainiest month in Ljubljana?
May records the most rain days at 16, followed by September with 12. Most spring and autumn months see 10–12 rain days, so pack a light rain layer whenever you visit.
Is winter worth visiting Ljubljana?
Winter is cold and short on daylight — highs of 5.2 °C in January with only 5 hours of sunshine — but December's Christmas market and the lit-up castle make it atmospheric if you dress warmly.
Know when to go? Now decide where to stay — our Ljubljana area guide →
Areas of Ljubljana
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Ljubljana — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.