Bay of Islands weather At a latitude of 35º south, the Bay of Islands has a mild temperate climate, considered sub-tropical in the summer. Mean daily temperatures for the four seasons are as follows: Spring (Sep-Nov) max 19ºC (67ºF) min 9ºC(48ºF) Summer (Dec-Feb) max 25ºC (76ºF) min 14ºC (56ºF) Autumn (Mar-May) max 21ºC (70ºF) min … Continue reading WEATHER