average temperature perth
Perth: Annual Weather Averages. January is the hottest month in Perth with an average temperature of 25Â°C (76Â°F) and the coldest is July at 13Â°C (55Â°F) with the most daily sunshine hours at 13 in January. The wettest month is June with an average of 140mm of rain.anuary is the hottest month in Perth with an average temperature of 25Â°C (76Â°F) and the coldest is July at 13Â°C (55Â°F) with the most daily sunshine hours at 13 in January. The wettest month is June with an average of 140mm of rain.