Climate Overview
The climate in Voiron is temperate. The average annual temperature is 12°C and approximately 1341mm of precipitation falls per year. Voiron receives a notable amount of rainfall throughout the year, including during its driest month. Voiron is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to -1°C. Snowfall occurs from January to December, with around 119cm accumulating over the season.
Temperature
Temperatures in Voiron vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 21°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 3°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.
Precipitation
Voiron is a fairly wet location, receiving approximately 1341mm of precipitation annually, which averages out to around 112mm per month. The wettest month is May, averaging 156mm of rainfall. December and November also tend to see above-average precipitation. The driest month is August, with just 80mm. That's 76mm less than May, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 119cm accumulating over the season. January typically sees the most snow at around 31cm.
Wind
Voiron is relatively calm, with an average annual wind speed of 6km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 6km/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
3 days until Autumn
It is currently summer in Voiron, which began on June 21, 2026. Voiron 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 August at around 27°C, while the coldest stretch bottoms out in January near -1°C. Autumn is next, beginning on September 23, 2026 (3 days from now).
Spring
Temperatures range from 3 to 19°C. Rainfall is heavy, totalling around 360mm across the season with a monthly average of 120mm. Winds are generally light, averaging 7km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 14 to 27°C. Precipitation is moderate at around 282mm for the season, averaging 94mm per month. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 3 to 22°C. Rainfall is heavy, totalling around 342mm across the season with a monthly average of 114mm. Expect around 17cm of snow accumulation during this period. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -1 to 10°C. Rainfall is heavy, totalling around 357mm across the season with a monthly average of 119mm. Expect around 78cm of snow accumulation during this period. Winds are generally light, averaging 6km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Voiron is during July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 87mm per month. By contrast, January can be quite cold with temperatures dropping to -1°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for Voiron 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.
