2018 Long Range Weather Forecast for Kahului, HI

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How to Read Long-Range Weather Forecasts

Long-range predictions show weather trends in temperatures and precipitation. For example, will the winter be colder or warmer than average? Will there be more or less snow than what's typical for your area?  Our famous predictions (traditionally 80% accurate) are made 18 months in advance, and meant to help you make more informed decisions for long-term planning.

Here on Almanac.com, we provide free long-range forecasts for the next 30 to 60 days covering U.S. and Canadian regions. Find all 12 months of predictions in the annual Old Farmer's Almanac.

Free 2-Month Weather Forecast

AUGUST 2017: temperature 81° (0.5° below avg.); precipitation 1.6" (1" above avg.); Aug 1-13: Showers and heavier t-storms E, a few showers C+W; warm; Aug 14-20: Isolated showers, cool; Aug 21-31: Showers and a heavier t-storm; warm, then cool.

SEPTEMBER 2017: temperature 81° (0.5° below avg.); precipitation 0.8" (avg.); Sep 1-9: A few showers, warm E; sunny, cool C+W. 10-21 Showers E, a few sprinkles C+W; seasonable; Sep 22-30: A few showers, seasonable.

Annual Weather Summary: November 2017 to October 2018

Winter season temperatures will be below normal, on average, with the coolest periods in early and mid-December, early and mid-January, and mid-February. Rainfall will be below normal, with the stormiest periods in mid-December and early and mid-March. April and May will be slightly cooler and drier than normal. Summer temperatures will be cooler than normal, on average, with slightly below normal rainfall. The warmest period will be in mid-June. September and October will be cooler and slightly drier than normal.

Key: east (E), central (C), west (W). Note: Temperature and precipitation are substantially based upon topography. The detailed forecast focuses on the HonoluluWaikiki area and provides general trends elsewhere.

About the Hawaii Region

The Hawaii long range weather region includes all or part of the following states: HAWAII (Hilo, Honolulu, Kahului, Pearl City, Waipahu).

Hawaii Neighboring Regions

Here are the regions that neighbor the Hawaii long range weather region:

    Temperature and Precipitation November 2017 to October 2018

    Temperature and Precipitation Graph