| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.2° | -1.7° | 75mm | 9.6 | 25 |
| February | 7.5° | -0.8° | 87.6mm | 8.8 | 38 |
| March | 12.1° | 2.1° | 84mm | 9.4 | 56 |
| April | 17.3° | 6.3° | 95.7mm | 11.6 | 68 |
| May | 21.9° | 10.7° | 122.7mm | 13.1 | 74 |
| June | 26.2° | 14.8° | 121.2mm | 11.6 | 77 |
| July | 28.2° | 16.3° | 129.9mm | 11.2 | 73 |
| August | 27.6° | 15.9° | 134.9mm | 10.4 | 77 |
| September | 22° | 11.8° | 168.1mm | 10.9 | 78 |
| October | 16.5° | 8.1° | 125.6mm | 10.3 | 68 |
| November | 9.8° | 4.1° | 134.6mm | 13.2 | 41 |
| December | 4.4° | -0.7° | 111.1mm | 11.1 | 24 |
January in Ljubljana averages a daily high of 4.2°C with nights around -1.7°C. Expect roughly 9.6 wet days totalling 75mm. A hard month to visit for comfort alone.
February in Ljubljana averages a daily high of 7.5°C with nights around -0.8°C. Expect roughly 8.8 wet days totalling 87.6mm. Demanding conditions — pack for it and plan indoor options.
March in Ljubljana averages a daily high of 12.1°C with nights around 2.1°C. Expect roughly 9.4 wet days totalling 84mm. Generally workable, with some weather to plan around.
April in Ljubljana averages a daily high of 17.3°C with nights around 6.3°C. Expect roughly 11.6 wet days totalling 95.7mm. Generally workable, with some weather to plan around.
May in Ljubljana averages a daily high of 21.9°C with nights around 10.7°C. Expect roughly 13.1 wet days totalling 122.7mm. Generally workable, with some weather to plan around.
June in Ljubljana averages a daily high of 26.2°C with nights around 14.8°C. Expect roughly 11.6 wet days totalling 121.2mm. Comfortable conditions for being outdoors all day.
July in Ljubljana averages a daily high of 28.2°C with nights around 16.3°C. Expect roughly 11.2 wet days totalling 129.9mm. Generally workable, with some weather to plan around.
August in Ljubljana averages a daily high of 27.6°C with nights around 15.9°C. Expect roughly 10.4 wet days totalling 134.9mm. Comfortable conditions for being outdoors all day.
September in Ljubljana averages a daily high of 22°C with nights around 11.8°C. Expect roughly 10.9 wet days totalling 168.1mm. Comfortable conditions for being outdoors all day.
October in Ljubljana averages a daily high of 16.5°C with nights around 8.1°C. Expect roughly 10.3 wet days totalling 125.6mm. Generally workable, with some weather to plan around.
November in Ljubljana averages a daily high of 9.8°C with nights around 4.1°C. Expect roughly 13.2 wet days totalling 134.6mm. Demanding conditions — pack for it and plan indoor options.
December in Ljubljana averages a daily high of 4.4°C with nights around -0.7°C. Expect roughly 11.1 wet days totalling 111.1mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Ljubljana peaks at 78.
Based on 30 years of records, May–September scores highest for comfort in Ljubljana, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 28.2°C.
September is the wettest, averaging 168.1mm of rain across roughly 10.9 wet days.
January is the coolest month, with average daily highs around 4.2°C.