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Best time to visit Slovenia

In Ljubljana: May to September — the months averaging 18–27 °C by day. No other month of the twelve falls inside that band in Ljubljana.

Slovenia is not one climate. Each reference city below is answered on its own numbers.

Ljubljana

  1. January: 4 °C by day, -3 °C at night, 71 mm of rain
  2. February: 6 °C by day, -2 °C at night, 79 mm of rain
  3. March: 11 °C by day, 1 °C at night, 77 mm of rain
  4. April: 15 °C by day, 5 °C at night, 89 mm of rain
  5. May: 19 °C by day, 10 °C at night, 111 mm of rain, recommended
  6. June: 24 °C by day, 14 °C at night, 99 mm of rain, recommended
  7. July: 26 °C by day, 16 °C at night, 100 mm of rain, recommended
  8. August: 25 °C by day, 16 °C at night, 114 mm of rain, recommended
  9. September: 20 °C by day, 11 °C at night, 130 mm of rain, recommended
  10. October: 15 °C by day, 7 °C at night, 109 mm of rain
  11. November: 9 °C by day, 3 °C at night, 124 mm of rain
  12. December: 5 °C by day, -2 °C at night, 94 mm of rain
Warmest
July, 26 °C
Coolest
January, 4 °C
Driest
January, 71 mm
Wettest
September, 130 mm

Piran

May to September — 18–27 °C by day. 6 of the twelve months clear that band in Piran, so this is the driest run of 5 in a row.

  1. January: 8 °C by day, 4 °C at night, 81 mm of rain
  2. February: 9 °C by day, 4 °C at night, 84 mm of rain
  3. March: 12 °C by day, 6 °C at night, 83 mm of rain
  4. April: 16 °C by day, 9 °C at night, 90 mm of rain
  5. May: 20 °C by day, 14 °C at night, 105 mm of rain, recommended
  6. June: 25 °C by day, 19 °C at night, 77 mm of rain, recommended
  7. July: 27 °C by day, 21 °C at night, 69 mm of rain, recommended
  8. August: 27 °C by day, 21 °C at night, 91 mm of rain, recommended
  9. September: 23 °C by day, 17 °C at night, 149 mm of rain, recommended
  10. October: 18 °C by day, 13 °C at night, 137 mm of rain
  11. November: 14 °C by day, 9 °C at night, 157 mm of rain
  12. December: 10 °C by day, 5 °C at night, 115 mm of rain
Warmest
July, 27 °C
Coolest
January, 8 °C
Driest
July, 69 mm
Wettest
November, 157 mm

How this is worked out: a month qualifies when its mean daytime high falls between 18 °C and 27 °C. Where more than five qualify, the answer is the driest run of consecutive qualifying months; where none do, it is the driest three months in a row if the year is hot throughout, or the warmest three if it never gets there. The figures are the thirty-year monthly averages charted below, and they are averages, not a forecast — any single year can miss them by a wide margin.

Ljubljana

Long-term averages for Ljubljana: the mean daily high, the mean overnight low and the mean monthly rainfall across 30 years of ERA5 reanalysis data (1995–2024).

DayNight
-551525°C0200mmJanFebMarAprMayJunJulAugSepOctNovDecJanuary: Day 4 °C, Night -3 °C, Rain 71 mm. February: Day 6 °C, Night -2 °C, Rain 79 mm. March: Day 11 °C, Night 1 °C, Rain 77 mm. April: Day 15 °C, Night 5 °C, Rain 89 mm. May: Day 19 °C, Night 10 °C, Rain 111 mm. June: Day 24 °C, Night 14 °C, Rain 99 mm. July: Day 26 °C, Night 16 °C, Rain 100 mm. August: Day 25 °C, Night 16 °C, Rain 114 mm. September: Day 20 °C, Night 11 °C, Rain 130 mm. October: Day 15 °C, Night 7 °C, Rain 109 mm. November: Day 9 °C, Night 3 °C, Rain 124 mm. December: Day 5 °C, Night -2 °C, Rain 94 mm
Show the monthly table
Ljubljana
MonthDay (°C)Night (°C)Rain (mm)
January4-371
February6-279
March11177
April15589
May1910111
June241499
July2616100
August2516114
September2011130
October157109
November93124
December5-294

Piran

Long-term averages for Piran: the mean daily high, the mean overnight low and the mean monthly rainfall across 30 years of ERA5 reanalysis data (1995–2024).

DayNight
051015202530°C0200mmJanFebMarAprMayJunJulAugSepOctNovDecJanuary: Day 8 °C, Night 4 °C, Rain 81 mm. February: Day 9 °C, Night 4 °C, Rain 84 mm. March: Day 12 °C, Night 6 °C, Rain 83 mm. April: Day 16 °C, Night 9 °C, Rain 90 mm. May: Day 20 °C, Night 14 °C, Rain 105 mm. June: Day 25 °C, Night 19 °C, Rain 77 mm. July: Day 27 °C, Night 21 °C, Rain 69 mm. August: Day 27 °C, Night 21 °C, Rain 91 mm. September: Day 23 °C, Night 17 °C, Rain 149 mm. October: Day 18 °C, Night 13 °C, Rain 137 mm. November: Day 14 °C, Night 9 °C, Rain 157 mm. December: Day 10 °C, Night 5 °C, Rain 115 mm
Show the monthly table
Piran
MonthDay (°C)Night (°C)Rain (mm)
January8481
February9484
March12683
April16990
May2014105
June251977
July272169
August272191
September2317149
October1813137
November149157
December105115

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Sources (1)

What this guide was checked against. Rules and prices change — follow the official link before you rely on a detail.