FPHW60 PHFO 181342 SFPHFO State Forecast for Hawaii National Weather Service Honolulu HI 342 AM HST Mon May 18 2026 HIZ001-003-004-006-007-009>011-015>018-022-029>050-190445- Kauai-Oahu-Maui-Molokai-Lanai- 342 AM HST Mon May 18 2026 .TODAY...Partly sunny. Breezy. Windward and mountains, scattered showers. Leeward, isolated showers through the day. Highs 81 to 86. East winds 15 to 25 mph. .TONIGHT...Partly cloudy. Windward and mountains, scattered showers. Leeward, isolated showers through the night. Lows 70 to 75. East winds 15 to 20 mph. .TUESDAY...Partly cloudy. Breezy. Scattered showers windward and mountains. isolated showers leeward. Highs 82 to 87. Lows 70 to 75. East winds 15 to 25 mph. .WEDNESDAY...Partly cloudy. Breezy. Leeward, isolated showers during the day. Windward and mountains, scattered showers. Highs 82 to 87. Lows 70 to 75. East winds 15 to 25 mph. .THURSDAY...Partly cloudy. Windy. Windward and mountains, isolated showers during the day, then scattered showers at night. Highs 81 to 86. Lows 69 to 74. Northeast winds 15 to 30 mph. .FRIDAY...Partly cloudy. Breezy. Windward and mountains, isolated showers during the day, then scattered showers at night. Highs 79 to 84. Lows 68 to 73. Northeast winds 15 to 25 mph. $$ HIZ023-026>028-051>054-190445- Big Island of Hawaii- 342 AM HST Mon May 18 2026 .TODAY...Mostly cloudy. Windward, occasional showers through the day. Isolated thunderstorms in the afternoon. Leeward, scattered showers through the day. Isolated thunderstorms in the afternoon. Locally heavy rainfall possible in the afternoon. Highs 84 to 89. Northeast winds 15 to 20 mph. .TONIGHT...Windward, mostly cloudy, Numerous showers. Leeward, mostly cloudy in the evening then clearing, scattered showers in the evening. Lows 72 to 77. Northeast winds 15 to 20 mph. .TUESDAY THROUGH WEDNESDAY...Partly cloudy. Scattered showers. Highs 83 to 88. Lows 71 to 76. Northeast winds 15 to 20 mph. .THURSDAY THROUGH FRIDAY...Partly cloudy. Scattered showers windward. Isolated showers leeward. Highs 82 to 87. Lows 71 to 76. Northeast winds 15 to 20 mph. $$