The National Sports Centre in Douglas says it's to reopen at 4pm.
Earlier today, the NSC said the River Glass had risen to risky levels after torrential rain this morning.
It tripped flood alarms and defence barriers had to be put up, prompting a temporary closure.
However, it now says it'll reopen from 4pm.
New amber warning issued for tonight's storm
Police appeal over theft of building materials
One of capital's oldest buildings may become housing
New NHS safety rule to be brought in on Island
Two city streets to shut for over six months
Revamp of airport terminal planned, says DOI
Four ferries now listed as cancelled today
One weekend sailing cancelled, others at risk because of weather