Klagenfurt weather in September

In September, Klagenfurt sees average daytime highs of 18°C and overnight lows near 9°C, with 139 mm of precipitation across 11.5 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Klagenfurt's 4th-clearest and 8th-windiest month. For the whole year in context, see Klagenfurt's year-round climate.

Daytime high
18°
4th warmest
Overnight low
9th coldest
Precipitation
139 mm
11.5 wet days
Daylight
12 h 18 min
5:47 AM – 6:07 PM
Cloud cover
61%
4th clearest
Wind
5 km/h
8th windiest
Solar energy
3.43 kWh/m²
Travel score
5.5
out of 10

Klagenfurt is capital city of Carinthia, Austria.

Air quality
Elevated
PM2.5 18.1 µg/m³ · 2010
Density
835/km²
people per km²
Founded
1193

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 16°C by the end.

A typical September day in Klagenfurt reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 23°C. Set against its neighbours, September runs about 5°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12011
22011
32011
42011
52011
62011
71911
81910
91910
101910
111910
121910
131910
141810
151810
16189
17189
18189
19189
20179
21179
22179
23179
24178
25178
26178
27168
28168
29168
30168

How September really feels in Klagenfurt

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Klagenfurt weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°496.958.80.0
Feb / -5°597.36100.0
Mar / -1°769.84.911.61.5
Apr13° / 9612.62.113.33.4
May18° / 11914.60.214.85.1
Jun21° / 12°13614.8015.65.8
Jul23° / 13°14014.9015.36.2
Aug23° / 13°152140146.3
Sep18° / 13911.50.112.45.5
Oct13° / 1219.81.110.63.6
Nov / 12010.63.49.20.9
Dec / -4°808.56.28.40.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35149
45050
55050
65050
75050
85050
94951
104951
114852
124852
134753
144654
154753
164654
174654
184555
194456
204456
214456
224357
234357
244357
254357
264258
274258
284060
294060
304060

Chance of precipitation in September

Any precipitation

Klagenfurt gets around 139 mm of rain and snow over 11.5 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 44% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
144
244
343
442
542
641
741
841
941
1040
1140
1240
1339
1439
1539
1638
1738
1838
1938
2038
2137
2237
2336
2436
2535
2635
2735
2835
2935
3036

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
156377
258366
360355
462344
563334
665323
766313
868302
969292
1070282
1171272
1273261
1374251
1476231
1577221
1678211
1779201
1881181
1983170
2085150
2186140
2287130
2389110
2490100
259190
269280
279370
289460
299460
309550

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 5:27 AM to 6:06 AM, and sunset from 6:38 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:276:38
213.15:296:36
313.15:306:34
413.05:316:32
512.95:336:30
612.95:346:28
712.85:356:25
812.85:376:23
912.75:386:21
1012.75:396:19
1112.65:416:17
1212.65:426:15
1312.55:436:13
1412.45:456:11
1512.45:466:09
1612.35:476:07
1712.35:496:05
1812.25:506:03
1912.25:516:01
2012.15:535:59
2112.05:545:57
2212.05:555:54
2311.95:575:52
2411.95:585:50
2511.85:595:48
2611.86:015:46
2711.76:025:44
2811.66:035:42
2911.66:055:40
3011.56:065:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.43 kWh/m².

For context, solar energy here swings from a low near 1.11 kWh/m² to a high of 5.66 kWh/m² in June across the year — September's 3.43 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.0Bright
34.0Moderate
44.0Moderate
53.9Moderate
63.9Moderate
73.8Moderate
83.8Moderate
93.7Moderate
103.7Moderate
113.6Moderate
123.6Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.3Moderate
183.3Moderate
193.2Moderate
203.2Moderate
213.1Moderate
223.1Moderate
233.1Moderate
243.0Moderate
253.0Moderate
262.9Moderate
272.9Moderate
282.8Moderate
292.8Moderate
302.8Moderate
Planning a trip in September

Is September a good time to visit Klagenfurt?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.5
Sightseeing
4th-best month of the year
1.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Klagenfurt for sightseeing.

What to pack for Klagenfurt in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Klagenfurt sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in Klagenfurt in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Klagenfurt peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar5Moderate
Apr7High
May7High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Klagenfurt in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Klagenfurt is worst in March — around 22 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Klagenfurt's WHO annual average of 18.1 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2322 µg/m³Nov 914 µg/m³
PM2.5 (µg/m³)Level
Jan21Moderate
Feb19Moderate
Mar22Moderate
Apr22Moderate
May19Moderate
Jun21Moderate
Jul18Moderate
Aug16Moderate
Sep15Moderate
Oct15Moderate
Nov14Moderate
Dec17Moderate
Location & terrain

Where is Klagenfurt?

Klagenfurt sits at 46.6°N, 14.3°E, 450 m above sea level, in Austria. The nearest listed city is Sankt Martin, 2.0 km away.

VillachKranjBohinjWolfsberg

Topography around Klagenfurt

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Klagenfurt.

Within 3 km, the terrain around Klagenfurt has only modest variations in elevation — a maximum elevation change of 167 m around an average of 453 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,434 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,802 m.

The land around Klagenfurt is covered by artificial surfaces (49%) and trees (24%) within 3 km, trees (55%) within 16 km, and trees (74%) within 80 km.

3 km
167 m
16 km
1,434 m
80 km
2,802 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sankt Martin 2.0 km · Sankt Peter 3.0 km · Bled 32 km · Villach 34 km · Kranj 43 km · Bohinj 48 km · Wolfsberg 48 km · Ljubljana 66 km

Austria travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 82% of US
price level, 2025
GDP per capita
$62,930
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.9
per 100k, 2023
Road deaths
4.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 616
Religion
Roman Catholic 55%none 22%Muslim 8%other 5%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Klagenfurt (46.6247°, 14.3053°, elevation 450 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).