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Ljubljana · Slovenia · 1995–2024 averages

Ljubljana weather, month by month. July is the pick.

Thirty years of averages for Ljubljana, Slovenia — how hot it really feels, when the rain arrives, and what the air is like. July comes out on top; December is the one to skip.

Ljubljana's red-tiled old town roofs, with wooded hills and mountains behind
Photo: Wikimedia Commons

The year at a glance

Tap a month for its full breakdown.

July

bestscore 76.4/100

Mild, sticky and some rain, with moderate air.

Feels like
27°
mild
Real temp
26°
mild
Humidity
73%
sticky
Rain
100mm
some rain
Cloud cover
48%
bright
Air quality
52
moderate
Daylight
15.3h
long days

Month by month, metric by metric

Each row is one measure across the same twelve months. The tint says how good that month is for it, the word says why.

  • Good
  • Okay
  • Rough
  • Grim

Feels like

peaks at 27° in July

  1. Jan1°freezing
  2. Feb3°freezing
  3. Mar7°cold
  4. Apr13°cold
  5. May19°cool
  6. Jun25°mild
  7. Jul27°mild
  8. Aug27°mild
  9. Sep20°cool
  10. Oct14°cool
  11. Nov7°cold
  12. Dec2°freezing

Real temp

4–26° in the shade across the year

  1. Jan4°freezing
  2. Feb6°cold
  3. Mar11°cold
  4. Apr15°cool
  5. May19°cool
  6. Jun24°mild
  7. Jul26°mild
  8. Aug25°mild
  9. Sep20°cool
  10. Oct15°cool
  11. Nov9°cold
  12. Dec5°cold

Humidity

73% at its driest, 86% at its most oppressive

  1. Jan83%sweaty
  2. Feb79%sweaty
  3. Mar75%sweaty
  4. Apr74%sticky
  5. May76%sweaty
  6. Jun75%sweaty
  7. Jul73%sticky
  8. Aug75%sweaty
  9. Sep80%sweaty
  10. Oct84%sweaty
  11. Nov86%soupy
  12. Dec86%soupy

Rain

131mm in September, 71mm in January

  1. Jan71mmdryish
  2. Feb79mmsome rain
  3. Mar77mmsome rain
  4. Apr89mmsome rain
  5. May111mmsome rain
  6. Jun99mmsome rain
  7. Jul100mmsome rain
  8. Aug114mmsome rain
  9. Sep131mmrainy
  10. Oct109mmsome rain
  11. Nov124mmsome rain
  12. Dec94mmsome rain

Cloud cover

48% at its clearest, 75% at its greyest

  1. Jan71%grey
  2. Feb66%mixed
  3. Mar61%mixed
  4. Apr61%mixed
  5. May61%mixed
  6. Jun55%mixed
  7. Jul48%bright
  8. Aug50%bright
  9. Sep59%mixed
  10. Oct68%mixed
  11. Nov75%grey
  12. Dec73%grey

Air quality

worst in January, cleanest in May

  1. Jan95moderate
  2. Feb89moderate
  3. Mar77moderate
  4. Apr62moderate
  5. May51moderate
  6. Jun54moderate
  7. Jul52moderate
  8. Aug54moderate
  9. Sep55moderate
  10. Oct66moderate
  11. Nov76moderate
  12. Dec95moderate

Daylight

8.7h to 15.7h of daylight across the year

  1. Jan9.1hshort
  2. Feb10.4hshortish
  3. Mar11.9hshortish
  4. Apr13.6heven
  5. May15hlong days
  6. Jun15.7hlong days
  7. Jul15.3hlong days
  8. Aug14.1hlong days
  9. Sep12.5heven
  10. Oct10.9hshortish
  11. Nov9.5hshort
  12. Dec8.7hshort

Ljubljana's air changes sharply through the year

The air is at its worst in January at 95 AQI (moderate), and at its cleanest in May at 51 (moderate). It tracks the seasons closely.

Every month in full

All twelve months, all seven measures.

MonthFeels likeReal tempHumidityRainCloud coverAir qualityDaylight
January1° freezing4° freezing83% sweaty71mm dryish71% grey95 moderate9.1h short
February3° freezing6° cold79% sweaty79mm some rain66% mixed89 moderate10.4h shortish
March7° cold11° cold75% sweaty77mm some rain61% mixed77 moderate11.9h shortish
April13° cold15° cool74% sticky89mm some rain61% mixed62 moderate13.6h even
May19° cool19° cool76% sweaty111mm some rain61% mixed51 moderate15h long days
June25° mild24° mild75% sweaty99mm some rain55% mixed54 moderate15.7h long days
July27° mild26° mild73% sticky100mm some rain48% bright52 moderate15.3h long days
August27° mild25° mild75% sweaty114mm some rain50% bright54 moderate14.1h long days
September20° cool20° cool80% sweaty131mm rainy59% mixed55 moderate12.5h even
October14° cool15° cool84% sweaty109mm some rain68% mixed66 moderate10.9h shortish
November7° cold9° cold86% soupy124mm some rain75% grey76 moderate9.5h short
December2° freezing5° cold86% soupy94mm some rain73% grey95 moderate8.7h short

Ljubljana weather questions

What is the best time to visit Ljubljana?
July scores best across temperature, rain, humidity and air quality — 27° feels-like, 100mm of rain and 73% humidity. December is the month to avoid: 94mm of rain and 95 AQI.
How hot does Ljubljana get?
July is the peak, at 27° feels-like (26° in the shade) — mild. Even in July it reaches 27°.
When is the rainy season in Ljubljana?
September is the wettest month at 131mm, and January the driest at just 71mm.
Is air quality a problem in Ljubljana?
January is the worst month at 95 AQI (moderate), and May the best at 51 (moderate).

Weather normals from Open-Meteo (ERA5 reanalysis, 1995–2024) and CAMS air quality (2015–2024), licensed CC-BY-4.0. Contains modified Copernicus Climate Change Service information. These are long-run averages, not forecasts — any given year will differ.

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