Climate Insights for Perth

The climate in Perth is cold. The average annual temperature is -13°C and approximately 129mm of precipitation falls per year. July is the wettest month, receiving around 33mm of rainfall. Perth 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: July, August, December. The coldest months are May, April, March, when temperatures can drop to -25°C. Snowfall occurs from January to December, with around 129cm accumulating over the season.

Perth sees moderate temperature variation throughout the year, ranging from -25°C to -5°C. July is the warmest month, though highs remain moderate at -5°C with a mean of -8°C. May brings the harshest conditions, with lows dropping to -25°C and an average temperature of -21°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 12°C shift in average temperatures.

Perth is a quite dry location, receiving approximately 129mm of precipitation annually, which averages out to around 11mm per month. The wettest month is June, averaging 33mm of rainfall. July and October also tend to see above-average precipitation. The driest month is December, with just 1mm. That's 32mm 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. Snowfall is a regular feature from January to December, with around 129cm accumulating over the season. June typically sees the most snow at around 33cm.

Perth is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, 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 9km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently winter in Perth, which began on June 21, 2026. Perth 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 July at around -5°C, while the coldest stretch bottoms out in May near -25°C. Spring is next, beginning on September 23, 2026 — 19 days from now.

The table below shows monthly climate averages for Perth 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.