Your September weather guide
WarmWeather in Vienna in September
September is a good time for Vienna if you want comfortable sightseeing weather rather than reliable summer heat. Average highs are around 20°C, with nights falling to about 12°C, so light layers will be more useful than a suitcase built around hot weather. The catch is rain: about 9 days have measurable rainfall. Go if you are happy to adjust outdoor plans around showers and put on a jacket for the evening.
Long-term climate averages for Vienna, not a forecast · 1991-2020
Vienna, month by month
Your snapshot
At a glance
The useful details for Vienna.
- Average daytime high
- 20.3°C
- 9 in 10 days stay below 26°C
- Average night-time low
- 11.9°C
- coldest 10% of nights: 8°C or lower
- Compared with London
- +1.7°C
- London averages 18.6°C in September
- Sunshine per day (est.)
- 5.4h
- 44% of 12.3 h of daylight
- Rainy days (1 mm+)
- 9
- 72 mm over the month
- Humidity
- 73%
- Days over 25°C
- 12%
- 0% over 30°C
- Record high 1991-2020
- 34.0°C
- 2015-09-01
- Record low 1991-2020
- 2.8°C
- 2002-09-30
- Flight from London
- ≈ 2 h 18 min
- 1232 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Vienna. Against London's average high of 18.6°C in September, Vienna is 1.7°C warmer by day and 0.7°C warmer at night.
Daytime and night-time in September
The typical September day in Vienna peaks at 20.3°C, but that is an average: the warmest 10% of days reach 25.5°C or more. Roughly 1 in 8 days top 25°C and 1 in 250 pass 30°C. Nights average 11.9°C; one night in ten drops to 8.1°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 34.0°C (2015-09-01) and the coldest night 2.8°C (2002-09-30).
Rain in September
Wet (more than 8 rainy days): about 9 days with 1 mm or more, 72 mm in total. Year to year it varies a lot - the wettest September was 2007 with 158 mm, the driest 2006 with 21 mm. Humidity averages 73%.
Sunshine and daylight
Around 5.4 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:32 and sets about 19:08 local time in mid-September. Average cloud cover is 56%.
Is September a good time to visit Vienna?
September is not the strongest month here: warm days and frequent rain. The best months for Vienna on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug.
Warm afternoons, but pack for cooler evenings
Daytime temperatures generally suit walking around the city without having to organise everything around avoiding midday heat. There is still a chance of a warmer spell: 12% of days reach 25°C, so short sleeves deserve some space in your bag. The bigger packing consideration is the drop after dark. Average lows are 11.9°C, while the coldest 10% of nights fall to 8.1°C or below. Bring a jumper and a jacket rather than relying on a light shirt throughout the day. September suits travellers who prefer moderate warmth, but it is less convincing if sitting outdoors late into the evening is central to the trip.
Leave room to change plans when it rains
Rain is a meaningful drawback rather than a reason to rule September out. With about 9 rainy days, a waterproof jacket and shoes that cope with wet pavements are sensible choices. Keep outdoor plans flexible instead of making the whole trip depend on dry weather. Sunshine averages about 5.4 hours a day within 12.3 hours of daylight, so there is useful daylight for exploring, but you should not expect clear skies throughout. These averages do not tell you how rain will fall during your stay. The practical approach is to use dry spells for longer walks and keep indoor time easy to rearrange.
A little perspective
Vienna through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|
| January | 3.1°C | -2.8°C | 2.4 | 35 | 8 | 0% |
| February | 5.5°C | -2.1°C | 3.3 | 32 | 8 | 0% |
| March | 10.1°C | 1.1°C | 4.3 | 46 | 9 | 0% |
| April | 15.7°C | 5.5°C | 5.9 | 45 | 9 | 2% |
| May | 19.9°C | 10.4°C | 6.3 | 73 | 12 | 13% |
| Junebest | 23.7°C | 14.2°C | 6.9 | 76 | 12 | 38% |
| Julybest | 25.8°C | 16.3°C | 7.3 | 78 | 12 | 58% |
| Augustbest | 25.7°C | 16.1°C | 7.1 | 70 | 10 | 55% |
| SeptemberSelected | 20.3°C | 11.9°C | 5.4 | 72 | 9 | 12% |
| October | 14.6°C | 7.2°C | 3.8 | 48 | 9 | 0% |
| November | 8.6°C | 2.8°C | 2.4 | 44 | 9 | 0% |
| December | 3.8°C | -1.6°C | 2.3 | 39 | 9 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Vienna in September FAQs
Plain answers, grounded in the averages.
Is Vienna hot in September?
Vienna is warm in September: the average daytime high is 20.3°C and nights average 11.9°C. Roughly 1 in 8 September days reach 25°C.
How much does it rain in Vienna in September?
Vienna sees about 9 rainy days (1 mm or more) and 72 mm of rain in a typical September. The wettest September between 1991 and 2020 was 2007 (158 mm) and the driest was 2006 (21 mm).
How sunny is Vienna in September?
Vienna gets around 5.4 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Vienna compare with the UK in September?
Vienna is on average 1.7°C warmer than London by day in September (20.3°C against 18.6°C).
What is the hottest September on record in Vienna?
Between 1991 and 2020 the hottest September day in Vienna reached 34.0°C on 2015-09-01, and the coldest night dropped to 2.8°C on 2002-09-30.
Is Vienna warmer than London in September?
Yes, but only modestly. Vienna's average daytime high is 20.3°C, compared with London's 18.6°C, a difference of 1.7°C. Expect a slightly warmer daytime feel rather than a major change from UK September weather, and still pack layers for evenings.
Is September the best month to go for weather?
June, July and August are stronger choices overall for weather. September still works well if you favour moderate daytime warmth and can accept rain disrupting some outdoor plans. It is less suited to a trip that depends on consistently hot, dry conditions.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at Vienna. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C