Race organisers say there'll be a three-hour delay to the racing schedule today because of heavy rain.
Roads are due to start closing from Barrule Park in Ramsey at 1.45pm, from the Bungalow at 2pm and around the rest of the course at 2.30pm.
Weather permitting, the Monster Energy Supersport Race and TT Zero electric race are due to be held today.
Organisers say they'll release an updated schedule at midday.
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