Friday’s meetings at Doncaster and Yarmouth will start early to avoid racing when temperatures are at their highest.
Doncaster’s first race is scheduled for 10:15, with the final race at 13:15. Yarmouth’s fixture will now begin at 10:30 and the last race will be at 13:30.
The Met Office on Wednesday issued a new amber weather warning for Friday at 11am which triggered the move.
Saturday's card at Windsor has been pushed back to an evening fixture for the same reason. The first race will now be at 17:15 instead of 13:50, and the final race will be held at 20:15 instead of 17:10.
The other fixture currently taking place in an amber weather warning zone on Saturday is Lingfield Park, which is already scheduled to take place in the evening.
The BHA had already cancelled four meetings scheduled for Wednesday which were in areas under a red weather warning and brought forward the start times at Newmarket and Nottingham on Thursday.
They say each upcoming fixture will be managed on a case-by-case basis in line with the their hot weather policy, with several factors considered according to the local weather forecast and environmental conditions.
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