Officials will reassess the situation at lunchtime
TT racing is due to resume today, but we don't know when roads are due to close.
Delays to the schedule are expected following forecast rain this morning.
Ronaldsway Met Office is predicting outbreaks of rain will clear early in the afternoon allowing 'bright or sunny spells to develop'.
Further updates will be given at 12-noon, ahead of the Supersport and Superstock races.
Harrison wins fourth Southern 100 solo championship with new lap record
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Five races conclude after opening session of Championship Day
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Honda rider sets new lap record in commanding victory