The weather in Hawaii is warm throughout the year with temperatures in daytime ranging in the highs from 78 F in winter to 88 F in the summer. In fact, there are only two seasons in Hawaii – winter or hooilo and summer or kau. The tropically warm weather round the year here is because Hawaii is close to the equator. The winter season in Hawaii is from December to February, while summer season is from July to September. The weather in Hawaii remains lovely and the same every day. You can also see flowers in bloom always in this beautiful island destination.