The Hauraki Gulf and its surrounds experiences a subtropical marine climate. Summer tends to be warm and humid with maximums in the mid to high 20's, winters are generally mild and many parts of the region only receive a few frosts per year. Autumn and Spring can bring strong south westerly winds around the equinox.

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Deep low pressure systems are generally when more extreme weather events will occur. Ex-Tropical cyclones can effect the region between December to April and cold core winter cyclones generally between June and August.

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Rainfall is generally plentiful all year round with occasional extreme heavy downpours and dry spells. Thunderstorms are more frequent during the winter months and can trigger waterspout formations in the Gulf and tornadoes inland. 

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Annual rainfall totals around the gulf are generally between 1000mm to 1400mm. The Coromandel, Hunua, Waitakere Ranges and the western side of Great Barrier Island are about 50% higher than lower-lying areas surrounding of the Hauraki Gulf. The driest areas are around Leigh, Mangawhai and on the eastern side of Waiheke Island with an average around 900mm.