Semmering weather in September

In September, Semmering sees average daytime highs of 16°C and overnight lows near 8°C, with 112 mm of precipitation across 14.1 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 14°C by the end. The sky is clear or mostly clear about 24% 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 Semmering's 4th-clearest and 8th-windiest month. For the whole year in context, see Semmering's year-round climate.

Daytime high
16°
4th warmest
Overnight low
9th coldest
Precipitation
112 mm
14.1 wet days
Daylight
12 h 18 min
5:41 AM – 6:01 PM
Cloud cover
64%
4th clearest
Wind
9 km/h
8th windiest
Solar energy
3.39 kWh/m²
Travel score
4.5
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 18°C in the first days to 14°C by the end.

A typical September day in Semmering reaches about 16°C in the afternoon and slips back to 8°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 22°C. Set against its neighbours, September runs about 5°C cooler than August and about 5°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11810
21810
31810
41810
51810
61810
7179
8179
9179
10179
11179
12179
13169
14168
15168
16168
17168
18168
19158
20158
21157
22157
23157
24157
25157
26157
27147
28147
29147
30146

How September really feels in Semmering

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.

Semmering weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°5711.310.78.70.0
Feb / -4°5310.410.49.90.0
Mar / -1°7714.29.911.60.5
Apr11° / 8514.4513.32.5
May16° / 13318.90.514.93.9
Jun19° / 11°14218.5015.74.9
Jul21° / 12°14919.2015.45.2
Aug21° / 12°13816.7014.15.4
Sep16° / 11214.10.312.44.5
Oct11° / 78122.510.62.7
Nov / 6310.96.89.10.5
Dec / -4°5611.610.18.30.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24258
34258
44357
54258
64159
74159
84159
94159
104060
114060
124060
133961
143961
153862
163862
173862
183862
193862
203862
213961
223961
233961
243961
254159
264060
274060
284060
294060
303961

Chance of precipitation in September

Any precipitationSnow

Semmering gets around 112 mm of rain and snow over 14.1 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 47% and peaks near 53% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
1531
2531
3521
4521
5511
6511
7511
8501
9501
10491
11491
12481
13481
14471
15471
16471
17471
18461
19461
20461
21451
22451
23441
24441
25431
26431
27432
28432
29432
30433

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
174242
277221
378211
479201
580191
682180
784160
885150
986140
1087130
1188120
1289110
1389110
1490100
159190
169280
179280
189370
199370
209460
219550
229550
239640
249730
259730
269820
279820
289820
299910
309910

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 5:20 AM to 6:01 AM, and sunset from 6:33 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:206:33
213.25:216:31
313.15:236:29
413.05:246:27
513.05:266:24
612.95:276:22
712.95:286:20
812.85:306:18
912.75:316:16
1012.75:336:14
1112.65:346:12
1212.65:356:10
1312.55:376:08
1412.55:386:05
1512.45:396:03
1612.35:416:01
1712.35:425:59
1812.25:445:57
1912.25:455:55
2012.15:465:53
2112.05:485:50
2212.05:495:48
2311.95:515:46
2411.95:525:44
2511.85:535:42
2611.75:555:40
2711.75:565:38
2811.65:585:36
2911.65:595:34
3011.56:015:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.39 kWh/m².

For context, solar energy here swings from a low near 1.01 kWh/m² to a high of 5.52 kWh/m² in June across the year — September's 3.39 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.7Moderate
83.7Moderate
93.7Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.3Moderate
183.3Moderate
193.2Moderate
203.2Moderate
213.2Moderate
223.1Moderate
233.1Moderate
243.0Moderate
253.0Moderate
263.0Moderate
272.9Moderate
282.9Moderate
292.8Moderate
302.8Moderate
Planning a trip in September

Is September a good time to visit Semmering?

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

4.5
Sightseeing
4th-best month of the year
0.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Semmering for sightseeing.

What to pack for Semmering in September

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

In September, Semmering sees daytime highs around 16°C and nights near 8°C. Pack rain gear. Worth having: a warm layer. About 14 days see rain.

rain geara warm layer

UV index in Semmering 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 Semmering peaks around July 16 at about 8 (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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr6High
May6High
Jun8Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Semmering 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 Semmering is worst in June — around 15 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1415 µg/m³Nov 1110 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb11Good
Mar14Moderate
Apr15Moderate
May14Moderate
Jun15Moderate
Jul13Moderate
Aug13Moderate
Sep11Good
Oct10Good
Nov10Good
Dec12Good
Location & terrain

Where is Semmering?

Semmering sits at 47.6°N, 15.8°E, 0 m above sea level, in Austria. The nearest listed city is Wiener Neustadt, 36 km away.

Wiener NeustadtBadenEisenzickenEisenstadtSopronMödlingPerchtoldsdorfAndritz

Topography around Semmering

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

Within 3 km, the terrain around Semmering has large variations in elevation — a maximum elevation change of 904 m around an average of 1,024 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,667 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,142 m.

The land around Semmering is covered by trees (85%) within 3 km, trees (79%) within 16 km, and trees (61%) within 80 km.

3 km
904 m
16 km
1,667 m
80 km
2,142 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Wiener Neustadt 36 km · Baden 51 km · Eisenzicken 51 km · Eisenstadt 57 km · Sopron 57 km · Mödling 61 km · Perchtoldsdorf 63 km · Andritz 65 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 Semmering (47.6335°, 15.8299°, elevation 0 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).