Arosa Weather in September
September in Arosa brings moderate temperatures around 13°C (55°F) during the day, dropping to 3°C (37°F) at night, with quite a bit of rainfall expected, averaging around 131 mm (5.2 in) for the month.
Rainfall in Arosa in September
Climate statistics over the past 30 years suggest around 15 days of rain, with 131 mm (5.2 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Arosa in September
If you're visiting Arosa in September, expect highs of 13°C (55°F) and overnight lows around 3°C (37°F). The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 3°C (37°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Arosa in September
The area experiences a moderate amount of sunshine, with approximately 162 hours of sunlight expected. This means a decent mix of sun and overcast.
Wind Speed in Arosa in September
Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.September in Arosa has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Arosa's climate page.
Arosa Temperature in September
Min Temperature
3°C (37°F)
Max Temperature
13°C (55°F)
Chance of Rain
49%
Precipitation
131 mm (5.2 in)
Rainy days
15 days
Humidity
75% *
Windspeed
2 m/s (4 knots) *
Sunshine
162 hours *
Percentage Sunshine
53% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Arosa typically stay consistent throughout September, with daily highs averaging around 13°C (55°F). Nights are cold, with lows typically ranging from 5°C (41°F) to 8°C (46°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Arosa in September
Browse day-by-day weather records for Arosa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Arosa historical weather extremes in September
Our historical data for Arosa spans 1976 to 2025, revealing these weather extremes.
- The warmest day in September was on September 10, 2011, with a maximum of 27°C (81°F).
- The coldest September day was on September 25, 2002, with a maximum of -1°C (30°F).
- Nighttime temperatures dropped to -7°C (19°F) on September 28, 1989, marking the coldest September night on record.
- The wettest September day on record brought 57 mm (2.2 in) of precipitation to Arosa (September 1, 2018).
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Arosa in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Arosa in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Arosa's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Arosa climate overview or explore weather in Switzerland.
