Officials in Victoria and NSW have made changes to race meetings because of the forecast for extreme heat.

Racing Victoria has brought forward race times for this week's Yarra Valley and Kyneton meetings in a bid to avoid the hottest part of the days.

The Corowa meeting across the border in NSW has been moved from Tuesday, when 45 degrees is forecast, to Thursday.

Tuesday's Yarra Valley meeting will start an hour earlier with the first race at 11.20am and the final race on the program at 3pm.

RV said temperatures were expected to reach 39 degrees in the area while on Wednesday temperatures are expected to get up to 41.

The Kyneton meeting on Wednesday has been scheduled to start at 11am with the final race at 2.30pm but RV will continue to monitor the forecast and make a final decision on Tuesday whether the meeting goes ahead.

Victoria also has a twilight city meeting on Wednesday, with the opening race at Sandown scheduled to jump at 4pm and the last at 7.30pm.

Gunnedah in north eastern NSW will go ahead on Tuesday with the expected temperature 40 degrees and the Level Two heat policy in place.

Want more racing news? Cups Betting delivers you the latest horse racing news from all the major thoroughbred cups and feature races.