December 21, 2017 Weather Forecast

Photo Credit: James Grenz

Our weather team will bring you any urgent weather alerts or updates as they occur. Check our breaking news section for the latest.

**Click directly on the images below to make them larger. Charts include: Hawaii Island high/low forecasted temperatures, projected winds, projected localized weather conditions and expected wave heights.**

Hilo

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 63. West wind around 7 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Tonight: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. High near 72. Breezy, with a north wind 7 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Tomorrow: Showers likely, mainly before 7pm. Widespread haze before 7pm. Mostly cloudy, with a low around 61. North wind around 9 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Low around 59. East wind 3 to 5 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Tonight: Occasional showers. The rain could be heavy at times. Widespread haze. High near 76. Light and variable wind becoming southeast 5 to 8 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between 2 and 3 inches possible.

Tomorrow: Isolated showers before midnight. Partly cloudy, with a low around 58. Southeast wind 5 to 7 mph becoming light and variable in the evening. Chance of precipitation is 20%.

Waimea

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 51. Northeast wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Tonight: Occasional showers. The rain could be heavy at times. Widespread haze. High near 68. Breezy, with a northeast wind 14 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts in excess of 4 inches possible.

Tomorrow: Scattered showers, mainly before midnight. Partly cloudy, with a low around 50. Breezy, with a northeast wind 6 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Kohala

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 45. Breezy, with a northeast wind 8 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight: Occasional showers. The rain could be heavy at times. Widespread haze. High near 64. Windy, with a northeast wind 16 to 21 mph increasing to 23 to 28 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Tomorrow: Scattered showers. Mostly cloudy, with a low around 43. Breezy, with an east northeast wind 16 to 21 mph decreasing to 7 to 12 mph in the evening. Winds could gust as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

South Point

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 71. North wind 3 to 7 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight: Occasional showers. The rain could be heavy at times. Widespread haze. High near 75. Northeast wind 6 to 8 mph becoming east southeast in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Tomorrow: Isolated showers. Widespread haze. Partly cloudy, with a low around 71. East southeast wind 5 to 7 mph becoming light and variable in the evening. Chance of precipitation is 20%.

Puna

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 61. North northwest wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Tonight: Occasional showers. The rain could be heavy at times. Widespread haze. High near 71. Breezy, with a north wind 10 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between 2 and 3 inches possible.

Tomorrow: Scattered showers. Widespread haze. Mostly cloudy, with a low around 59. North northwest wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Hamakua

Today: Occasional snow showers. The snow could be heavy at times. Some thunder is also possible. Widespread haze. Low around 20. Windy, with a southwest wind 13 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of 4 to 8 inches possible.

Tonight: Occasional snow showers before noon, then rain showers likely. The snow could be heavy at times. High near 29. Blustery, with a west southwest wind 8 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

Tomorrow: Clear, with a low around 25. Very windy, with a north wind 15 to 20 mph increasing to 28 to 33 mph after midnight. Winds could gust as high as 48 mph.

Waikoloa

Today: Occasional showers and possibly a thunderstorm. Some of the storms could produce gusty winds and heavy rain. Widespread haze. Low around 59. Breezy, with an east wind around 18 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Tonight: Occasional showers. The rain could be heavy at times. High near 77. Windy, with an east northeast wind 18 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New precipitation amounts between 2 and 3 inches possible.

Tomorrow: Clear, with a low around 58. Windy, with an east northeast wind 18 to 23 mph decreasing to 7 to 12 mph in the evening. Winds could gust as high as 32 mph.

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Synopsis

The potential for heavy rainfall persists across the eastern half of the main island chain tonight, thanks to a slow moving cold front near the Big Island and a developing upper low. Cool northeast post- frontal winds dominating Kauai and Oahu tonight will spread to all the islands Thursday as the developing upper low maintains the threat for locally heavy showers for Maui and the Big Island. The threat of heavy rainfall will diminish Thursday night and Friday as the upper low departs. Locally breezy northeast trade winds will continue into the weekend, with an increase in windward showers expected Friday night and Saturday. Lighter winds and drier weather are expected Sunday and Christmas day, although another front may bring increased showers by Tuesday.

Data Courtesy of NOAA.gov