Australia scores 94 in the first Test match, but the run chase is cut short in Sydney due to bad weather. Heat will compete in the Challenger against Melbourne Renegades.
Even when the weather did temporarily improve, both sides knew they were doomed when the rain started up again minutes later.
With the win, Thunder, who advanced from the group in fourth place, is eliminated, while Heat go to the knockout round where they will play the Melbourne Renegades, who finished third.
Both of their regular-season encounters were won by Renegades by 22 runs and four wickets.
Khawaja, who nearly doubled his BBL|12 total with a 15th T20 half-century, will bring some remarkable form into that game.
The Australia Test opener hit 55 balls for 10 fours and three sixes before being caught off Ben Cutting at the wicket.
With his backing, Marnus Labuschange (73) helped add 128 runs for the second wicket.
Ross Pawson (2-0-32-0) and Usman Qadir (4-0-50-0) were two of the night’s biggest victims for the Thunder onslaught.
With Warner hitting four fours in a 20-ball, 36-run inning, Thunder appeared to be in terrific condition for the chase SCG.
Matthew Gilkes had Matthew Kuhnemann caught on the boundary by James Bazley, who then grabbed the vital wicket.
However, the Thunder’s rate of scoring decreased as the rain got harder. After the vital fifth over was completed, nine runs were scored off the remaining 11 balls, leaving them shy of the DLS par score of 60.