Climate Insights for Bacchus Marsh

The climate in Bacchus Marsh is temperate. The average annual temperature is 13°C and approximately 609mm of precipitation falls per year. October is the wettest month, receiving around 72mm of rainfall. Bacchus Marsh 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 July, June, August, when temperatures can drop to 6°C.

Bacchus Marsh sees moderate temperature variation throughout the year, ranging from 6°C to 26°C. The warmest month is January, when average highs reach 26°C and the mean temperature sits around 19°C. July is the coolest month, with minimum temperatures around 6°C and an average of 8°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 3°C shift in average temperatures.

Bacchus Marsh is a relatively dry area, receiving approximately 609mm of precipitation annually, which averages out to around 51mm per month. The wettest month is October, averaging 72mm of rainfall. November and January also tend to see above-average precipitation. The driest month is February, with just 28mm. That's 44mm 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.

Bacchus Marsh is mildly breezy, with an average annual wind speed of 19km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in April, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.

It is currently autumn in Bacchus Marsh, which began on March 20, 2026. Bacchus Marsh 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 July near 6°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Bacchus Marsh 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 46mm per month. By contrast, July can be quite cold with temperatures dropping to 6°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 Bacchus Marsh 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.