In August, the weather in Palmerston North is typically warm. Average daily high temperature in August is about 10 degrees above zero. On average, Palmerston North has 16 rainy, 6 sunny, 6 cloudy, and 3 partly cloudy days in August. The rains are usually moderate. August as well as May, June, July, and September is considered the most uncomfortable time to visit Palmerston North.