I found this on the SANFL web site as there Heat Policy.
SANFL HEAT POLICY
LEAGUE AND RESERVES
Normal Conditions
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
20min + time on Nil 6 min 20 min 6min
32°C or above
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
20 min + time on 2 min break @ approx.15min mark 6 min 20 min 6 min
38°C or above
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
20 min + Time on 2min break @ approx. 15min mark 10 min 20 min 10 min
Under all conditions Leagues matches will commence 2.20pm
Commencement Times for Reserves:
Normal Conditions – 11.35am
Heat Policy 32 degrees or above – 11.25am
Heat Policy 38 degrees or above – 11.15am
UNDER 19s AND UNDER 17s
Normal Conditions
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
20min + time on Nil 6 min 20 min 6min
32°C or above
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
15 min + time on 2 min break @ approx. 10 min mark 10 min 20 min 10 min
38°C or above
Length of Quarters Heat Policy Break ¼ Break ½ Time ¾ Time Break
10 min + Time on 2min break @ approx. 7 min mark 10 min 20 min 10 min
Under all conditions:
Under 17 matches will commence at 11.35am
Under 19 matches will commence at 2.20pm
Is this just for Pre Season games or is it for Premiership season as well?
If it is for the Premiership Season in Juniors you wouldn't want to get the bottom side on an extremely hot day as it makes for a short game.