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Climate · Arosa

Arosa in September

Cool and wet, as the days shorten.

Typical weather, averaged over 30 years

September in Arosa is cool: highs near 58°F, lows near 37°F. Rain falls on about four days a week, less often as the month goes on, and the days shorten by 1 hour 12 minutes from the first week to the last.September in Arosa is cool: highs near 14°C, lows near 3°C. Rain falls on about four days a week, less often as the month goes on, and the days shorten by 1 hour 12 minutes from the first week to the last.

High
58°F14°Caverage
Low
37°F3°Caverage
Wet days
4a week · 50% of days
Daylight
12h 27mon average

Is September a good time to visit Arosa?

A good month, just outside Arosa's best months, which run from July to August.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 58°F in September, against 28°F to 65°F through the year.Highs near 14°C in September, against -2°C to 18°C through the year.

Chance of a wet day

50% of days in September, against 43% to 68% through the year.

Cloud cover

57% cover in September, against 52% to 65% through the year.

Daylight

12h 27m in September, against 8h 36m to 15h 48m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August65°18°low 43°low 6°4 wet days a weekRain on about four days a week.
  2. September58°14°low 37°low 3°4 wet days a weekRain on about four days a week.
  3. October52°11°low 32°low 0°3 wet days a weekRain on about three days a week.

Where Arosa sits, in September

Europe/Zurich
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:58 AMsets 7:36 PM
Above the sea
1,800 mhigh country
Latitude
46.8°Nnorthern hemisphere
Nearest of ours
Bad Ragaz28 km north-west

The land around Arosa, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Switzerland in September

high · low · wet days
See September on the planning mapThe whole year in Arosa

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Arosa. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.