Climate Insights for Kwinana

The climate in Kwinana is warm and mild. The average annual temperature is 23°C and approximately 227mm of precipitation falls per year. July is the wettest month, receiving around 33mm of rainfall. Kwinana 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: October, September, November. The coldest months are June, July, August, when temperatures can drop to 7°C.

Temperatures in Kwinana vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is October, when average highs reach 32°C and the mean temperature sits around 26°C. June is the coolest month, with minimum temperatures around 7°C and an average of 12°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between May and June, with a 10°C shift in average temperatures.

Kwinana is a quite dry location, receiving approximately 227mm of precipitation annually, which averages out to around 19mm per month. The wettest month is June, averaging 33mm of rainfall. July and March also tend to see above-average precipitation. The driest month is October, with just 0mm. That's 33mm less than June, 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.

Kwinana 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 7km/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 5km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 4km/h in winter, 3km/h in spring, 6km/h in summer, 7km/h in autumn.

It is currently winter in Kwinana, which began on June 21, 2026. Kwinana 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 October at around 32°C, while the coldest stretch bottoms out in June near 7°C. Spring is next, beginning on September 23, 2026 — 18 days from now.

The best time to visit Kwinana is during February, March, April, May, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 22mm per month. By contrast, October can be uncomfortably hot with highs reaching 32°C, while June 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 Kwinana 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.