Climate Overview
The climate in Heidelberg is cold. The average annual temperature is -11°C and approximately 84mm of precipitation falls per year. April is the wettest month, receiving around 12mm of rainfall. Heidelberg is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: June, July, May. The coldest months are August, September, July, when temperatures can drop to -12°C. Snowfall occurs from January to December, with around 84cm accumulating over the season.
Temperature
Heidelberg has relatively stable temperatures year-round, staying within a 3°C range. June is the warmest month, though highs remain moderate at -9°C with a mean of -11°C. The coldest month is August, when overnight lows fall to -12°C and the daily average is -11°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.
Precipitation
Heidelberg is a quite dry location, receiving approximately 84mm of precipitation annually, which averages out to around 7mm per month. The wettest month is April, averaging 12mm of rainfall. May and March also tend to see above-average precipitation. The driest month is December, with just 4mm. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 84cm accumulating over the season. April typically sees the most snow at around 12cm.
Wind
Heidelberg is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, 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.
Seasons
16 days until Spring
It is currently winter in Heidelberg, which began on June 21, 2026. Heidelberg is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in June at around -9°C, while the coldest stretch bottoms out in August near -12°C. Spring is next, beginning on September 23, 2026 — 16 days from now.
Spring
Temperatures range from -12 to -10°C. Precipitation is minimal, with only around 17mm for the entire season. Winds are generally light, averaging 4km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from -11 to -10°C. Precipitation is minimal, with only around 17mm for the entire season. Winds are generally light, averaging 5km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -12 to -9°C. Precipitation is minimal, with only around 33mm for the entire season. Expect around 33cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from -12 to -9°C. Precipitation is minimal, with only around 16mm for the entire season. Expect around 16cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
Monthly Climate Data
The table below shows monthly climate averages for Heidelberg 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.
