Barometric Pressure in Sion, Switzerland 
1025.1 hPa
6 ℃
82%
0.94 m/s
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The average pressure in Sion, Valais, Switzerland today is , which is higher than normal. Pressure is trending falling.
Weather prediction: Rain at times, worse later
Rapid Pressure Changes
Rapid pressure changes detected in Sion, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Rise : ()
The daily total fluctuation in pressure in Sion is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Sion hour by hour across the next 6 hourly readings.
Sion, Valais, Switzerland, lies in the sheltered Rhône Valley, where the Alps block many wet airflows. This rain-shadow setting brings many dry, bright days, though passing fronts can still bring rain or mountain snow. Air pressure often rises after these systems move through.
The narrow valley channels winds along the Rhône, and nearby slopes can change local conditions. Foehn winds, often linked to pressure differences across the Alps, can bring sudden warm, dry air. In winter, strong high pressure may trap cold air and fog near the valley floor.
Winter often brings frost and some snow, while nearby peaks get much more. Spring shifts quickly between mild days and showers. Summers are warm and mostly sunny, with brief storms possible over the mountains. Autumn cools gradually, and valley fog can return.