Race organisers say they're keeping a close eye on the weather tonight.
Manx Grand Prix's second practice is due to see the TT course shut from 6pm.
However, unsettled weather could arrive around 7pm, and more rain is expected this afternoon.
Race control says it'll make a final decision about whether the session will go ahead at 3pm.
Northern bus services to be raised in Keys
Ben out of service for maintenance work this week
Richmond Hill closed again tonight for work
October warmer and sunnier than usual, says Met Office
MHK queries cost of Liverpool awards trip
DOI says it has 20 empty public sector homes
Marquee plan submitted by Milntown Estate
Fire crews called to free driver from crashed car