The best time to visit Slovenia is May–Oct. Month by month, the verdicts rate Jul–Sep as comfortable on both daytime heat and rainfall — 3 months in all.
Hot dry summers, wet winters
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 2.7 | 37 | 27% | Too cold |
| February | 4.6 | 40 | 30% | Too cold |
| March | 9.4 | 49 | 31% | Fair |
| April | 14.2 | 58 | 40% | Fair |
| May | 18.8 | 66 | 45% | Fair |
| June | 22.6 | 73 | 48% | Fair |
| July | 24.9 | 77 | 42% | Go |
| August | 25.5 | 78 | 39% | Go |
| September | 20.2 | 68 | 40% | Go |
| October | 14.8 | 59 | 37% | Fair |
| November | 8.6 | 47 | 42% | Fair |
| December | 3.5 | 38 | 33% | Too cold |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
January is the driest month, with rain on 27% of days and daytime highs near 2.7°C (37°F). June is the wettest, at 48%. Temperature swings hard across the year — 22.8°C between August (25.5°C / 78°F) and January (2.7°C / 37°F) — so packing for the wrong month is the main risk. The record rules out too cold in Dec–Feb.