Hawaii: Oahu: Strategies: When to Go

The weather on Oahu is blissfully predictable: sunny and warm year-round. The Big Island, which lies south of Oahu, is hotter, Kauai wetter and Maui windier, but Oahu has perpetual late-spring weather, with daytime temperatures hovering between 70 and 85 degrees. November through March is the best time for whale-watching, and November through February are when the big waves hit on the North Shore and professional surfers gather for the competitions.