Climate Insights for Ballan

The climate in Ballan is temperate. The average annual temperature is 13°C and approximately 655mm of precipitation falls per year. Ballan receives a notable amount of rainfall throughout the year, including during its driest month. Ballan 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: January, February, December. The coldest months are August, June, July, when temperatures can drop to 5°C.

Temperatures in Ballan vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 26°C and the mean temperature sits around 19°C. August is the coolest month, with minimum temperatures around 5°C and an average of 8°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Ballan is a relatively dry area, receiving approximately 655mm of precipitation annually, which averages out to around 55mm per month. The wettest month is September, averaging 70mm of rainfall. October and November also tend to see above-average precipitation. The driest month is March, with just 35mm. That's 35mm less than September, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Ballan 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 July, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 3km/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.

It is currently winter in Ballan, which began on June 21, 2026. Ballan 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 January at around 26°C, while the coldest stretch bottoms out in August near 5°C. Spring is next, beginning on September 23, 2026 — 90 days from now.

The best time to visit Ballan is during January, February, March and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 47mm per month. By contrast, August can be quite cold with temperatures dropping to 5°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Ballan 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. 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.