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Complete 2014 Long-Range Weather Forecast for the Hawaii Region, November 2013 to October 2014 includes week-by-week details.
Free 2-Month Weather Forecast
AUGUST 2014: temperature 81.5° (avg.); precipitation 3.1" (5" above avg. east, avg. west); Aug 1-5: Showers, cool east; scattered showers, hot central and west; Aug 6-21: Scattered t-storms, seasonable east; brief daily showers, hot central and west; Aug 22-31: A few t-storms east, scattered showers central and west; seasonable.
SEPTEMBER 2014: temperature 81° (0.5° below avg.); precipitation 0.3" (1" below avg. east, avg. west); Sep 1-11: Showers and t-storms, cool east; scattered showers, turning hot central and west; Sep 12-14: A few t-storms, cool; Sep 15-20: Scattered showers, seasonable; Sep 21-23: A few showers, cool; Sep 24-30: Scattered showers, cool.
Annual Weather Summary: November 2013 to October 2014
Winter temperatures will range from about 1 degree above normal, on average, on the Big Island to near normal on Oahu to more than a degree below normal on Kauai and Nihau. The coolest periods will occur from late December through early January and in mid-January and early to mid-February. Winter rainfall will be much greater than normal, especially on the Big Island, where record rainfall may occur.
April and May will be rainier than normal from the Big Island westward to Oahu, but drier than normal in the west. Temperatures will be slightly above normal, on average.
Summer rainfall and temperatures will be above normal, with the hottest periods in mid-June and mid- to late July and additional hot periods on all but the Big Island from mid-August into early September.
September and October temperatures will be slightly cooler than normal, with below-normal rainfall.
NOTE: Temperature variations in Hawaii are largely elevation-based, with higher elevations noticeably cooler than elevations closer to sea level. Precipitation often varies tremendously throughout the islands, even at similar elevations. For example, Hilo, at an elevation of 31 feet above sea level, averages more than 130 inches of rain per year, while Honolulu, at a similar elevation (7 feet), averages only about 20 inches of rain per year. Because there is so much variation in rainfall, we have based the forecast on the Honoluluâ€“Waikiki area and expressed only general trends elsewhere throughout the islands. Thus, for example, the forecast does note a widespread rain, but not a locally heavy rainfall.