Honolulu is expected to have light to moderate trade winds and sea breezes today as a weak trough moves through, bringing higher humidity and more showers, mainly over central and western islands. Satellite images show cloud bands linked to the trough, with showers likely for windward and mountain areas and some reaching leeward spots. On Tuesday, strengthening trade winds are forecast as the trough moves west, leading to drier and more stable weather through the weekend, according to the National Weather Service.
A weak trough will move west and fade today as high pressure builds northwest of Hawaii, strengthening trade winds tonight through Wednesday. A Small Craft Advisory will go into effect this evening for waters and channels around Maui County and the Big Island, with the possibility of expansion to other areas. Tropical Storm Iona, far southeast of the Big Island, is expected to pass south of the islands by midweek with minimal impacts, though the National Weather Service reports that "but some moderate south swells will be possible." A tropical disturbance may bring isolated thunderstorms to southern offshore waters, and surf along east-facing shores is expected to rise midweek as trade winds increase.
A westward‑moving disturbance today is increasing humidity through trade winds and sea breezes, lowering fire danger for now. Starting Tuesday, drier and more stable conditions may bring some leeward areas close to fire‑weather humidity thresholds in the afternoons, but winds are expected to stay below critical levels. The National Weather Service has issued advisories and cautions for mariners and residents.
