First Alert Forecast: Heavy rain, potential flooding Monday, Tuesday

Very wet weather possible next week
Light trades bring sunshine and few showers this weekend, but First Alert Weather Days are likely Monday and Tuesday for heavy rain and possible flash flooding.
Published: Oct. 21, 2026 at 4:05 PM HST

HONOLULU (HawaiiNewsNow) - The trade winds continue to ease as we get deeper into the work week. We will settle into a pattern of light to moderate trades with plentiful sunshine and just a few passing showers through the weekend.

Big changes are possible when we start the new week. There is strong potential for a low pressure system to form about 1,300 miles to our southwest and slowly draw closer. As it does, it will pull up very moist tropic air from the south and create the possibility for heavy showers across the state. The slow movement of the low and the intensity of the showers could combine to cause flash flooding. We’re anticipating that Monday and Tuesday will be First Alert Weather days. Stay with us on-air, online, and on your mobile device for the very latest.

View the latest weather conditions here.

Download the HNN Weather app from the Apple App Store or Google Play for the latest updates from your First Alert Weather Team: chief meteorologist Jennifer Robbins and weather anchors Guy Hagi, Dan Cooke, Ben Gutierrez, and Billy V.

Download HNN's weather app for everything you need to plan your day.
Download HNN's weather app for everything you need to plan your day.(Hawaii News Now)