September in Flachau typically sees daytime highs of 15°C (59°F) and nighttime lows of 5°C (41°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Our weather planner can help you find worldwide destinations with pleasant weather during this period. August typically offers the best weather for Flachau.
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Pick a month to see the average temperature, rainfall and sunshine in Flachau - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Flachau typically stay consistent throughout September, with daily highs averaging around 15°C (59°F). Nights are cold, with lows typically ranging from 6°C (43°F) to 9°C (48°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Flachau spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Based on weather observations in Flachau between 1976 and 2026, these are the recorded extremes during September.
Find out more about the weather in Austria and which places have the best travel conditions in this month. See all of Austria in September →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. Sunglasses could come in handy during the sunnier parts of your trip.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Flachau climate overview or explore weather in Austria.
Where to go in September - average daytime high across popular destinations.
Vienna
22°C (72°F) Salzburg
18°C (64°F) Schladming16°C (61°F) Saalbach Hinterglemm15°C (59°F) Zell am See15°C (59°F) Mayrhofen
14°C (57°F) Neustift im Stubaital13°C (55°F) Sölden12°C (54°F) Need travel inspiration? Check out our bucket list articles and be inspired.
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