Climate Overview
The climate in Mendrisio is temperate. The average annual temperature is 14°C and approximately 1456mm of precipitation falls per year. Mendrisio receives a notable amount of rainfall throughout the year, including during its driest month. Mendrisio 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 1°C. Light snow can occur between January and December.
Temperature
Temperatures in Mendrisio vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 24°C. January is the coolest month, with minimum temperatures around 1°C and an average of 4°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.
Precipitation
Mendrisio is a fairly wet location, receiving approximately 1456mm of precipitation annually, which averages out to around 121mm per month. The wettest month is October, averaging 191mm of rainfall. May and June also tend to see above-average precipitation. The driest month is January, with just 49mm. That's 141mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 26cm annually. December is the snowiest month with approximately 10cm.
Wind
Mendrisio is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Mendrisio, which began on March 20, 2026. Mendrisio 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 29°C, while the coldest stretch bottoms out in January near 1°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 5 to 21°C. Rainfall is heavy, totalling around 360mm across the season with a monthly average of 120mm. Winds are generally light, averaging 11km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 18 to 29°C. Rainfall is heavy, totalling around 450mm across the season with a monthly average of 150mm. Winds are generally light, averaging 10km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 6 to 23°C. Rainfall is heavy, totalling around 457mm across the season with a monthly average of 152mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 1 to 10°C. Precipitation is moderate at around 189mm for the season, averaging 63mm per month. Expect around 22cm of snow accumulation during this period. Winds are generally light, averaging 10km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Mendrisio 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.
