Climate Insights for Monthey

The climate in Monthey is cool. The average annual temperature is 6°C and approximately 1920mm of precipitation falls per year. Monthey receives a notable amount of rainfall throughout the year, including during its driest month. Monthey is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -9°C. Monthey experiences heavy snowfall, typically from January through December.

Temperatures in Monthey vary considerably across the year, with a 29°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 20°C with a mean of 15°C. The coldest month is January, when overnight lows fall to -9°C and the daily average is -5°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Monthey is a fairly wet location, receiving approximately 1920mm of precipitation annually, which averages out to around 160mm per month. The wettest month is July, averaging 213mm of rainfall. May and June also tend to see above-average precipitation. The driest month is February, with just 109mm. That's 104mm less than July, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Monthey receives heavy snowfall, accumulating around 611cm annually from January through December. The snowiest month is January, with approximately 131cm. Winter travel should account for significant snow cover.

Monthey is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Monthey, which began on June 21, 2026. Monthey is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 20°C, while the coldest stretch bottoms out in January near -9°C. Autumn is next, beginning on September 23, 2026 (2 days from now).

The table below shows monthly climate averages for Monthey based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.