Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
1220 AM EDT Wed Sep 9 2026

Valid 00Z Thu 10 Sep 2026 - 00Z Thu 17 Sep 2026

In the wake of Hurricane Lowell, broad troughing will persist over
many of the main Hawaiian Islands through Thursday. This troughing
will allow for a greater coverage of light showers as compared to
normal, as well as the possibility of rain impacting the leeward
side of the islands. What's left of Lowell by Friday will be
tracking west again, so that troughing will also slowly track west
as well. In the wake of the trough during the day Friday, expect
less coverage of light rains as compared to normal due to normal 
ridging behind the trough as the trades get reestablished.

Over the weekend, a normal trade wind pattern returns to the
islands, making for the typical afternoon storms and dry periods
at other times. The next tropical wave still looks to approach the
islands Monday afternoon. The wave looks to be quite weak, so
while it will be slow-moving, threatening greater-than-normal
coverage of showers through Tuesday, no impacts are expected.
Drier weather returns on Wednesday.

There is some potential that the islands may be watching yet
another tropical cyclone trying to approach from the east at the
end of this period as this highly active hurricane season for
Hawaii and its environs continues.

Wegman