Update: Flash flood watch issued for Garden Isle, Ni‘ihau extended till Tuesday morning

Update 7:44 a.m. Dec. 15, 2025: A flash flood watch for Kaua‘i and Ni‘ihau was extended through 6 a.m. Tuesday.

According to the National Weather Service in Honolulu, a trough stalled over the western Hawaiian Islands today will continue to draw up more moisture-rich southern latitude
moisture across the islands of Kaua‘i, Ni‘ihau and O‘ahu.

Rain of between 1 to 4 inches on Sunday has saturated the ground and caused more swollen streams, meaning it will not take much rain to exacerbate minor flooding concerns today.

Flood-prone roads and other low-lying areas may be closed due to elevated runoff and overflowing streams. Urban areas may receive more significant flooding and property damage due to rapid runoff.

Showers may become locally heavy at times with the slight chance for thunderstorms.

Original post: A flash flood watch was issued for Kaua‘i and Ni‘ihau started Saturday night till late Monday.

The potential for locally heavy showers and isolated thunderstorms will increase across the western end of the state as a front approaches from the northwest on Saturday, then stalls Sunday and Monday, according to the National Weather Service in Honolulu.

Flood-prone roads and other low-lying areas may be closed due to elevated runoff and overflowing streams.

Urban areas may receive more significant flooding and property damage due to rapid runoff.