A storm that dumped 12 inches of rain on Kauai moved to Oahu, prompting the National Weather Service to issue a flash flood warning.
The severe weather down tree branches, created hazards for drivers and forced the cancellations of several weekend events.
"We have a flash flood watch out for the island of Oahu meaning the potential exists for damage to life and or property," said Tom Birchard, senior forecaster at the National Weather Service.
"Those kinds of rainfall could lead to ponding of water, especially in urban areas and make it a little tricky for driving."
Around 8 a.m. Firefighters and city emergency workers were called to the condominium at Punahou and Beretania streets where three large branches on a towering Banyan tree crashed onto three lanes of traffic on Beretania.
Although no one was injured by broken branches, the three lanes for several hours as city workers cleared tons of debris.
A city event at Thomas Square celebrating the legalization of gay marriages was canceled as was a protest against the state's plans to erect concrete barricades to block access to Laniakea Beach.
But the rain did little to dampen the spirits of holiday shoppers, who were out in droves enjoying the final day of the Black Friday weekend sales.
The flash flood warning will remain in effect until 7:45 p.m.