Climate Insights for Kojonup

The climate in Kojonup is temperate. The average annual temperature is 15°C and approximately 401mm of precipitation falls per year. August is the wettest month, receiving around 67mm of rainfall. Kojonup 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, July, September, when temperatures can drop to 6°C.

Temperatures in Kojonup vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 28°C and the mean temperature sits around 20°C. August is the coolest month, with minimum temperatures around 6°C and an average of 10°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Kojonup is a relatively dry area, receiving approximately 401mm of precipitation annually, which averages out to around 33mm per month. The wettest month is August, averaging 67mm of rainfall. July and February also tend to see above-average precipitation. The driest month is December, with just 19mm. That's 48mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Kojonup 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 February, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 4km/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 Kojonup, which began on June 21, 2026. Kojonup 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 28°C, while the coldest stretch bottoms out in August near 6°C. Spring is next, beginning on September 23, 2026 — 88 days from now.

The best time to visit Kojonup is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 27mm per month. By contrast, August can be quite cold with temperatures dropping to 6°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Kojonup 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.