Complete 2015 Long-Range Weather Forecast for the Hawaii Region, November 2014 to October 2015 includes week-by-week details.
Free 2-Month Weather Forecast
APRIL 2015: temperature 76° (0.5° above avg.); precipitation 7.7" (11" above avg. E, 3" above W); Apr 1-9: Rain and heavy t-storms E+C, showers W; warm; Apr 10-14: Showers and t-storms E+W, heavy rain C. 15-18 Rainy periods, cool; Apr 19-25: Showers, warm E+W; heavy rain and t-storms, cool C. 26-30 Showers, seasonable.
MAY 2015: temperature 77° (avg.); precipitation 4.7" (8" above avg. E, avg. W); May 1-8: Rainy periods, cool; May 9-15: Showers, seasonable; May 16-21: Scattered showers, warm E+W; showers and heavy t-storms, cool C. 22-31 Scattered showers, seasonable.
Annual Weather Summary: November 2014 to October 2015
Winter temperatures will be near or slightly above normal, with the coolest periods in late December, early and mid-January, and early and mid-February. Rainfall will be greater than normal on Oahu, Lanai, and Molokai, but below normal elsewhere.
April and May will be rainier than normal, especially on the Big Island. Temperatures will be near or slightly above normal.
Summer temperatures will be near normal, with the hottest periods in mid- and late July. Rainfall will be above normal, with a tropical storm threat in mid- to late August.
September and October temperatures will be slightly cooler than normal, with above-normal rainfall.
KEY: East (E), Central (C), West (W)