Slovenia · Month guide

Slovenia in September

Around 21 °C with 150 mm of rain and 5.6 hours of sun a day.

September is a solid shoulder-season month in Slovenia. Around 21 °C with 150 mm of rain and 5.6 hours of sun a day. Use the regional grid below to find where this month works best — national averages hide the swings between coast, highlands, and inland.

Plan a trip in September ← Slovenia year-round

Acceptable

Slovenia · September

What the weather usually does

Slovenia · typical month

Day / night
12 – 21 °C
Year range -2 – 26 °C
Rainfall
150 mm
Year range 81 – 163 mm
Sunshine
5.6 hr / day
Year range 2.9 – 7.7 hr / day

What’s open · September

Things to do in Slovenia in September

Everything below is open in September.

Open
Vintgar Gorge
a boardwalk pinned to the rock above the Radovna, a short way from Lake Bled
Sources: bled.si, routinelynomadic.com

Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.

193 regions · current month

Slovenia, taken apart

Safety · 4 governments

What the governments say about Slovenia

Combined advisory · most-cautious-wins

Exercise normal precautions

Highest level across 4 governments · Advisory last changed 2026-09-27

See breakdown by country

AU

Level 1Exercise normal precautions

Exercise normal precautions

Changed 2026-08-06Checked 2026-10-25www.smartraveller.gov.au

DE

Level 1Exercise normal precautions

Exercise normal precautions

Changed 2026-08-06Checked 2026-10-25www.auswaertiges-amt.de

NL

Level 1Exercise normal precautions

Exercise normal precautions

Changed 2026-08-06Checked 2026-10-25www.nederlandwereldwijd.nl

US

Level 1Exercise normal precautions

Exercise normal precautions

Changed 2026-09-27Checked 2026-10-25travel.state.gov

Climate at a glance · 10-year ERA5

A decade of weather, in one page

Temperature°C

— daytime high— overnight low▬ typical range

View data table

Month	Average daytime high (°C)	Average overnight low (°C)	Typical low	Typical high
January	4.5	-2.3	-8.8	10.7
February	7.6	-0.3	-7.5	13.4
March	11.3	1.7	-3.6	18.9
April	15.5	5.1	-1.4	22.9
May	18.8	9.6	4.9	25.1
June	24.8	14.6	10.4	30.9
July	26.4	15.8	11.7	31.2
August	26.2	15.6	10.9	31.7
September	21.0	11.5	5.4	26.7
October	16.0	7.4	2.0	21.7
November	9.1	2.9	-3.3	15.2
December	5.2	-0.8	-5.6	10.1

Rainfallmm

View data table

Month	Rainfall (mm)
January	81
February	83
March	89
April	96
May	163
June	111
July	124
August	120
September	150
October	113
November	131
December	92

Sunshinehr / day

View data table

Month	Sunshine hours (hr / day)
January	3.5
February	4.3
March	5.9
April	6.8
May	6.1
June	7.6
July	7.7
August	7.1
September	5.6
October	4.4
November	3.0
December	2.9

Windkm/h

— average▬ typical range

View data table

Month	Average wind speed (km/h)	Typical low	Typical high
January	7.3	4.0	12.9
February	7.9	4.2	14.7
March	7.9	4.4	12.8
April	7.8	4.8	13.1
May	6.9	4.2	11.2
June	6.2	3.9	9.8
July	5.7	4.0	8.9
August	6.0	4.1	9.7
September	6.5	4.1	10.1
October	7.0	4.0	12.1
November	7.0	4.1	11.7
December	6.6	4.0	11.4