Honolulu’s Sunday forecast calls for mostly clear skies, temperatures around 80 degrees and a stiff east-northeast breeze near 29 mph at the airport. The city should stay mostly sunny through the afternoon, with a high near 87 and wind gusts reaching 29 mph.
Sunny Sunday And Monday With Strong Trade Winds
Sunday night will turn partly cloudy, with temperatures dipping to about 77 degrees. Monday looks much the same: mostly sunny, warm and breezy, with a high near 87, overnight temperatures near 77 and gusts up to 28 mph.
The persistent trade winds will keep conditions comfortable for some outdoor plans but rougher along exposed areas. East-facing shores should see moderate surf, while south-facing beaches will keep above-average surf through early this week. Hawaii Ocean Safety advises beachgoers to choose lifeguarded beaches and check current conditions before entering the water.
Showers Increase Starting Tuesday
Tuesday brings a small shift, with isolated showers possible before noon and a high near 88 degrees. Shower chances rise Wednesday night and Thursday, when scattered showers could move through with mostly cloudy periods and highs in the mid-80s.
The National Weather Service says moisture moving in from the east could produce heavier showers and isolated thunderstorms, particularly toward the eastern end of the state. Honolulu’s forecast remains more modest, but residents should be ready for passing rain as the week progresses.
Trade Winds Strengthen Again Late Week
Friday and Saturday will remain partly sunny with occasional showers, while east-northeast winds strengthen. Saturday’s forecast calls for winds around 28 mph, with gusts potentially reaching 40 mph.
North-facing shores should stay flat to tiny through Monday before a modest bump Tuesday into Wednesday. Boaters should also note that a Small Craft Advisory remains in effect through Monday afternoon for several Maui County and Big Island waters, while conditions around Oahu may still be choppy in exposed areas.
How This Week Compares With Honolulu Norms
According to the National Weather Service's Honolulu climate normals, the normal high for September 20 is 88 degrees and the normal low is 75 degrees. The forecast overnight low of about 77 degrees is therefore slightly above that normal.
The available climate data do not establish how frequently late-September trade winds and passing showers occur. A separate comparison also involves a different weather setup: on August 1, 2026, Hawaii News Now reported very windy mountain and ridge conditions, elevated east-facing surf and choppy seas across Hawaii's coastal waters.
