Best time to visit Ljubljana

Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
I'm comfortable up to 27°C feels-like
22° heat-averse 30° heat-loving

Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.

Saved to this browser. Changes update the strips below.
Recent · 2020-2024
Interest Google Trends 2021-2025 searches, not arrivals (?)
Day · avg daily high (?)
Night · avg overnight low (?)
UV index · On a typical day around midday, UV is about this (?)
122456764211
On the sunniest 1 in 10 days, UV reaches this — and even higher
46688863
PM2.5 air quality · on a typical day (?)
31332214101081110162535
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
454936191415121815263956
June 9/10 feels 26°C (+2°C vs 1991-2020) · HCI 85/100
Day 26° · Night 14° · cools 12° at night 55% humidity 13 km/h wind 11 rain days (110h) 278h sun
Thermal 9
Sky 8
Rain 7
Wind 10

Higher = better, including rain & wind (green = "doesn't hurt the score", not "lots of it").

How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.

Compare with another destination

Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.

Tours in Ljubljana

6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Ljubljana).

  1. 1Ljubljana Small Group Food Walking Tour4.96★ (322)3h 30mfrom $106🔥 Selling fast
  2. 2Ljubljana Stand-Up Paddle Boarding Lesson and Tour4.89★ (281)2hfrom $69🔥 Selling fast
  3. 3Postojna Cave and Predjama Castle - Entrance Tickets Included4.83★ (1,019)6hfrom $128
  4. 4Slovenia in One Day: Small-Group Bled, Postojna Cave & Predjama4.86★ (910)10hfrom $153
  5. 5Lake Bled and Bohinj with Savica waterfall included4.84★ (522)10hfrom $122
  6. 6Tour to Postojna Cave and Predjama Castle from Ljubljana5.00★ (1)6hfrom $58

Last refreshed 2026-06-06.

Similar climatesLyon93% · Zagreb93% · Colmar93%

Other destinations with the most-alike year-round climate to Ljubljana (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Ljubljana's. Based on the 2020-2024 climatology, not this year's actual weather.

Month-by-month

Month Temp °C Feels °C Rain days Rain h Rain h/day Humidity Wind km/h Sun h UV Interest Score
Jan -3–6 3 9 121 13.4 74% 10 119 1 Quiet 4
Feb -1–10 7 7 98 14.0 66% 12 143 2 Quiet 6
Mar 0–12 9 10 117 11.7 56% 13 200 2 Quiet 6
Apr 3–16 13 8 113 14.1 54% 14 217 4 Quiet 7
May 9–20 19 17 207 12.2 62% 13 234 5 Quiet 6
Jun 14–26 26 11 110 10.0 55% 13 278 6 Quiet 9
Jul 16–28 29 11 94 8.5 52% 12 299 7 Quiet 7
Aug 16–27 29 10 104 10.4 58% 11 265 6 Peak 7
Sep 11–22 22 11 143 13.0 62% 12 218 4 Busy 8
Oct 8–17 17 10 141 14.1 72% 10 167 2 Moderate 7
Nov 2–10 8 9 121 13.4 77% 9 116 1 Peak 5
Dec -1–6 3 12 171 14.3 83% 8 80 1 Moderate 3

UV Index in Ljubljana by Month

UV index in Ljubljana peaks at 7 (high) in July, dropping to 1 (low) in January. June, July, August have high UV — SPF 30+ and sunglasses recommended.

Best months in detail

June

9/10

14–26°C · 11 rain days (110h) · 278 sun hours · 55% humidity · Quiet crowd · UV 6 (high) · sunniest 1 in 10 days reach 8 (very high)

September

8/10

11–22°C · 11 rain days (143h) · 218 sun hours · 62% humidity · Busy crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)

July

7/10

16–28°C (feels 29°C) · 11 rain days (94h) · 299 sun hours · 52% humidity · Quiet crowd · UV 7 (high) · sunniest 1 in 10 days reach 8 (very high)

Every month

Show the other 9 months in detail

January

4/10

-3–6°C (feels 3°C) · 9 rain days (121h) · 119 sun hours · 74% humidity · Quiet crowd · UV 1 (low)

February

6/10

-1–10°C (feels 7°C) · 7 rain days (98h) · 143 sun hours · 66% humidity · Quiet crowd · UV 2 (low)

March

6/10

0–12°C (feels 9°C) · 10 rain days (117h) · 200 sun hours · 56% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 4 (moderate)

April

7/10

3–16°C (feels 13°C) · 8 rain days (113h) · 217 sun hours · 54% humidity · Quiet crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)

May

6/10

9–20°C · 17 rain days (207h) · 234 sun hours · 62% humidity · Quiet crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)

August

7/10

16–27°C (feels 29°C) · 10 rain days (104h) · 265 sun hours · 58% humidity · Peak crowd · UV 6 (high) · sunniest 1 in 10 days reach 8 (high)

October

7/10

8–17°C · 10 rain days (141h) · 167 sun hours · 72% humidity · Moderate crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

November

5/10

2–10°C (feels 8°C) · 9 rain days (121h) · 116 sun hours · 77% humidity · Peak crowd · UV 1 (low)

December

3/10

-1–6°C (feels 3°C) · 12 rain days (171h) · 80 sun hours · 83% humidity · Moderate crowd · UV 1 (low)

Frequently asked questions about visiting Ljubljana

When is the best time to visit Ljubljana?

June is the highest-scoring month (9/10 on the Holiday Climate Index). Typical conditions: 14–26°C (11 rainy days). The top three months by score are June, September, July.

What is the worst time to visit Ljubljana?

December is the lowest-scoring month (3/10). Typical conditions: -1–6°C (12 rainy days).

When are crowds lowest in Ljubljana?

Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in August. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.

Which months in Ljubljana have good weather but fewer tourists?

June (climate 9/10, crowd index 18) and April (climate 7/10, crowd index 12) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.

What is the UV index in Ljubljana by month?

UV peaks at 7 (high) in July and is lowest in January at 1 (low). Monthly peak values: Jan 1, Feb 2, Mar 2, Apr 4, May 5, Jun 6, Jul 7, Aug 6, Sep 4, Oct 2, Nov 1, Dec 1.

What is the UV index in Ljubljana in July?

July is the peak UV month in Ljubljana, with a daily-peak UV index of 7 (high). Apply SPF 30+, wear sunglasses, and seek shade during midday hours.

How high can UV get in Ljubljana on the sunniest days?

Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. July is the worst case: typical days average UV 7 (high), but the top 10% of days reach UV 8 (very high) — and even higher. Months where the sunniest days routinely exceed the typical reading: March, April, May, June, July, August, September, October. Plan sun protection for the worst case, not the average.

Is air quality in Ljubljana bad for travelers?

PM2.5 (fine-particle pollution) exceeds the WHO sensitive-group guideline (15 µg/m³) in 9 months: January, February, March, April, August, September, October, November, December. The worst month is December with a typical-day mean of 35 µg/m³ (hazardous); on the worst 10% of days PM2.5 reaches 56 µg/m³ (hazardous) and higher. People with asthma, heart conditions, or sensitive children may want to avoid these months or limit outdoor activity. Source: CAMS via Open-Meteo.