Hawaii Braces for Persistent Trade Winds and Heavy Showers Through the Weekend

Key facts

• Northeast winds of 10–25 mph are forecast across most regions through Friday.
• Chance of rain reaches 90 percent today in windward areas, with occasional showers in the morning and scattered showers in the afternoon.
• Highs today range from 62°F to 84°F depending on elevation and location.
• Tonight's lows are expected between 60°F and 73°F, with isolated showers after midnight in some areas.
• An upper-level trough approaching the islands will deepen into an upper low just north of the state, sustaining trade winds into early next week.
• Leeward areas will see mostly sunny skies with only isolated showers, but windward and mauka locations face numerous to scattered showers.

Trade Winds Strengthen Across the Hawaiian Islands

Moderate to locally breezy easterly trade winds are set to dominate Hawaii's weather through the next several days, driven by a deepening upper-level low north of the archipelago. Forecasters expect sustained northeast winds of 10 to 25 mph across most regions, with gusts occasionally higher. This pattern, typical for this time of year, is being amplified by the approaching upper trough, which will lock in the trades and funnel moisture into windward slopes. The result: a prolonged period of showery conditions, especially for areas facing the prevailing wind.

Rainfall Chances Peak at 90% in Windward Zones

Today, windward and mauka locations face the highest probability of precipitation, with a 90 percent chance of occasional showers in the morning giving way to scattered showers in the afternoon. Highs in these areas will range from 65°F to 83°F, with east winds up to 20 mph. In contrast, leeward areas such as the south and west coasts of the major islands will see mostly sunny skies with isolated showers, and a rain chance of only 20 percent. Temperatures there will climb to between 73°F and 84°F, with northeast winds of 10 to 25 mph.

Overnight Conditions: Mostly Clear to Partly Cloudy

Tonight, skies will vary from mostly clear in leeward spots to partly cloudy with isolated showers in windward areas. Lows are forecast to dip to 60°F–73°F, with northeast winds of 10 to 20 mph. The chance of rain overnight is around 20 percent for most locations, though some windward areas may see a 50 percent chance of scattered showers. the upper low will keep the atmosphere unstable enough to produce occasional showers even after midnight, particularly over windward slopes and coastal sections.

Extended Outlook: Breezy Trades Persist Into Next Week

The trade wind regime is expected to continue into early next week, with the upper low maintaining its position north of the state. Friday will bring similar conditions: mostly sunny with scattered morning showers and isolated afternoon showers across windward areas, with highs of 76°F–83°F and northeast winds of 10 to 25 mph. Leeward areas will remain sunny and breezy, with highs reaching 84°F. The chance of rain on Friday holds steady at 40 percent for windward zones and 20 percent for leeward ones. No significant change is anticipated through the weekend.

What This Means for Residents and Visitors

For residents, the persistent trade winds mean a continued need for caution on windward roads, where sudden showers can reduce visibility and create slick surfaces. Gardeners and farmers should expect adequate moisture for windward crops, while leeward areas may require supplemental irrigation. Visitors planning outdoor activities should prepare for breezy conditions and pack rain gear for windward excursions. Beachgoers should be aware of increased surf on east-facing shores due to the sustained trades. The overall pattern, while active, is typical for this season and does not pose an immediate threat of severe weather.

Forecast Confidence and Monitoring

Meteorologists express high confidence in the trade wind pattern through the weekend, but note that the exact track of the upper low could shift rainfall distribution. A slight deviation north or south could enhance or diminish shower activity for specific islands. No watches or warnings are currently in effect, but forecasters will continue to monitor the upper-level system for any signs of intensification that could lead to localized flooding in windward areas. The public is advised to stay updated through official channels as the situation evolves.

The bottom line

• Breezy easterly trade winds of 10–25 mph will persist through the weekend and into early next week.
• Windward and mauka areas face the highest rain chances, peaking at 90% today, while leeward zones remain mostly sunny.
• An upper-level trough deepening north of the islands is the primary driver of the current weather pattern.
• Temperatures will range from 62°F to 84°F, with overnight lows between 60°F and 73°F.
• No severe weather warnings are in effect, but localized flooding is possible if the upper low intensifies.
• The pattern is typical for the season and does not indicate an extreme event.