Football Federation Australia has delayed kick-off between the Mariners and Adelaide at Central Coast Stadium on Sunday following a severe heat warning.
The mercury is not expected to drop sufficiently before the original kick-off time of 3pm, posing a risk for player welfare.
The current forecast Wet Bulb Globe Temperature (WBGT) reading will not be below the limit of 28 until after 6pm local time.
As a result the fixture has been rescheduled for 7pm (6:30pm ACDT).
A-League boss Damien de Bohun said there was no option but to delay the match.
"Our policy determines that we consider drinks breaks and delayed kick offs once the WBGT reaches 28," said de Bohun.
"The current forecast for Gosford shows the reading won't fall below 28 until after 6pm. In these circumstances, we've taken the decision to kick off at 7pm (6:30pm ACDT) to give everyone certainty.
"We regret the inconvenience a late change will cause, but this is beyond our control."
The match between Western Sydney Wanderers and Wellington Phoenix at Pirtek Stadium, Parramatta, will kick off today as scheduled at 5pm AEDT. The forecast WBGT readings show a level below 28 at kick off in Parramatta.
WBGT is a measure of the heat stress in direct sunlight, which takes into account temperature, humidity, wind speed, sun angle and cloud cover.