Weather in Swiss in September
Country-wide climate normals across 14 cities in Swiss.
How Hot Is Swiss in September?
Swiss's September is consistently warm — typical 20°C, with no major regional outliers.
Sunshine in Swiss in September
Swiss's September brings mixed skies — Zürich averages 4.3h of sun, with similar conditions nationwide. Cloudy periods alternate with sunny stretches, and the sun is up between 7:05 am and 7:35 pm. Plan for variability rather than guaranteed sunshine.
Does It Rain In Swiss In September?
Heavy rain shapes Swiss's September: Zürich averages 109mm across 11 days, and most regions of the country see similar persistent wet conditions. Long sunny stretches are rare. Expect rain on roughly two out of every three days.
Is Swiss Humid In September?
Swiss is enveloped in tropical-thick humidity through September: Zürich averages 78%, and most of the country tracks similarly. The constant moisture makes warm temperatures feel substantially hotter, and even nights bring limited cooling. Light cotton clothing is essential.
Wind In Swiss In September
Swiss's September has gentle wind — Zürich averages 10 kph, and the country tracks similarly. Outdoor activity is comfortable, and afternoon thermals add a pleasant breeze in inland areas.
Cloud Cover In Swiss In September
Cloudy skies dominate Swiss in September — 56% cover in Zürich, with similar overcast conditions in most regions. Direct sun is patchy and broken; expect grey stretches between brief bright moments. Coastal areas may be heavier than inland.