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Drivers have been warned of a risk of flooding on some roads as heavy rain is due to hit the island over a 10-hour period.
A yellow weather warning has been issued for heavy rain between 14:00 and 22:00 BST.
Ronaldsway Met Office said temporary downpours were possible across the island, with rainfall up to 1.8in (30mm) in places.
The warning comes after a TT fortnight that was beset with weather delays and cancellations.
It also follows the warmest, sunniest – and third driest – spring on record for the Isle of Man.