Winters in Waterlooville are cool and sometimes chilly, with temperatures often below freezing, averaging around 4°C in January. As spring approaches, temperatures gradually rise, reaching averages of 7-11°C by May. Summer brings warm days, with temperatures occasionally soaring above 25°C, but also experiencing mild mornings, peaking at an average high of 18°C in July and August. Autumn is similar to spring, with temperatures decreasing steadily throughout the months, averaging around 13°C in October. The coldest months are January and December, while May and June see the warmest temperatures.