Complete 2013 Long-Range Weather Forecast for the Hawaii Region, November 2012 to October 2013 includes week-by-week details.
Free 2-Month Weather Forecast
MAY 2013: temperature 78° (1° above avg.); precipitation 0.5" (5" below avg. east, 0.5" below central, 2" below west); May 1-3: T-storms; warm east, cool west; May 4-8: Scattered showers, warm east; sunny, seasonable central; sunny, cool west; May 9-15: Scattered showers, mainly east; turning hot; May 16-27: Daily showers east and central, sunny west; seasonable; May 28-31: Scattered showers, warm.
JUNE 2013: temperature 80.5° (1° above avg.); precipitation 0.5" (avg.); Jun 1-23: Daily showers and t-storms east, brief daily light showers central, daily showers west; warm; Jun 24-30: Sunny, hot east; sunny, seasonable central; a few showers, cool west.
Annual Weather Summary: November 2012 to October 2013
Winter season temperatures will range from about 2 degrees above normal, on average, on the Big Island to normal on Oahu to 1 degree below normal on Kauai and Nihau. The coolest periods will occur in early December, late December through early January, mid- to late January, and early February. Winter rainfall will be above normal on the Big Island, much above normal on the central islands, and slightly above normal on the western islands.
April and May will be much rainier than normal from the Big Island westward to Oahu, but drier than normal elsewhere. Temperatures will be above normal, on average, except for near normal on Kauai and Nihau.
Summer season rainfall and temperatures will be above normal, with the hottest periods in mid-May, late June, early July, early to mid-August, and early September.
September and October temperatures will be warmer than normal in the east and cooler than normal in the west. Rainfall on the Big Island will be much below normal, while rainfall elsewhere will be above normal.