Friday night's meeting at Moonee Valley meeting has been called off due to extreme heat, which has affected race tracks around the country in the past week.

The Bureau of Meteorology (BOM) has forecast tempratures to reach north of 40 degrees in Melbourne on Friday, and remain in the high 30’s until 10pm, when a late cool change is expected.

Racing Victoria announced on Wednesday that Moonee Valley's meeting would be moved back 30 minutes, in hopes of a cool change later in the afternoon, but would consult with club officials to decide whether the meeting will go ahead.

"The weather conditions forecast tomorrow are extreme and following consultation with our vets and the BOM it was determined that abandoning the meeting was the most appropriate decision for the welfare of our horses and participants,” Racing Victoria released in a statement.

Moonee Valley’s Friday night meeting is now one of four which have been lost in the past week, with meetings at Ascot, Bairnsdale and Dubbo also abandoned.

Racing Victoria also announced they would not reschedule the meeting, but affected runners could be nominated for upcoming meetings at Wangaratta and Weribee.