Climate Insights for Bunbury

The climate in Bunbury is warm and mild. The average annual temperature is 23°C and approximately 187mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. Bunbury 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: September, August, October. The coldest months are July, October, June, when temperatures can drop to 7°C.

Temperatures in Bunbury vary considerably across the year, with a 26°C difference between the coldest and warmest months. The warmest month is September, when average highs reach 33°C and the mean temperature sits around 26°C. July is the coolest month, with minimum temperatures around 7°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between July and August, with a 14°C shift in average temperatures.

Bunbury is a quite dry location, receiving approximately 187mm of precipitation annually, which averages out to around 16mm per month. The wettest month is July, averaging 33mm of rainfall. August and December also tend to see above-average precipitation. The driest month is September, with just 0mm. That's 33mm less than July, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Bunbury 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 May, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 7km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently winter in Bunbury, which began on June 21, 2026. Bunbury 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 September at around 33°C, while the coldest stretch bottoms out in July near 7°C. Spring is next, beginning on September 23, 2026 — 18 days from now.

The best time to visit Bunbury is during January, February, March, April, May, June and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 11mm per month. By contrast, September can be uncomfortably hot with highs reaching 33°C, while July is the coldest period with lows dropping to 7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Bunbury 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.