In the summer months of January, February, and December, temperatures in Porirua range from mild to warm, with average highs around 18°C. The autumn season brings a gradual cooling trend, with temperatures fluctuating between 4-22°C, before dropping further in May and June to averages below 13°C. Winters are cool, with July being the coldest month, experiencing lows as low as -2°C and highs around 10°C. Spring sees an increase in temperature, rising from 9°C in November to a range of 3-24°C by October.