The Scorchers yesterday qualified for the post season after they defeated the Melbourne Renegades by four wickets, finishing the regular season in third place on the WBBL ladder.
Dighton said they're not expecting an easy game on Thursday.
"Sydney Thunder will have gained some confidence after defeating the Brisbane Heat yesterday," Dighton said.
"The Thunder are a well balanced side that have potential match winners in Rachael Haynes and Alex Blackwell with the bat and Rene Farrell and Belinda Vakarewa with the ball."
The Scorchers put on a dominant display yesterday at Camberwell Sports Ground defeating the Melbourne Renegades by four wickets, marquee player Katherine Brunt (3-11(4) was the stand out player for the side taking three wickets.
The win follows the Scorchers four wicket loss to the Renegades at the same ground the day before and Dighton said the reversal of results provided confidence heading into the finals.
"I think we played really well yesterday, considering the short turnaround after our game the day before and the almost 40 degree heat.
"We nailed both power plays with our senior players really stepping up for us, Katherine Brunt was outstanding."
The Thunder go into the game on the back of a two run win over the Brisbane Heat, but the previous day the Thunder suffered a seven wicket loss to the same side.
The match between the Scorchers and Thunder, which gets underway at 12.10 AWST, will be broadcast live on Network Ten and can also be streamed on cricket.com.au.
The second Semi Final between the Sydney Sixers and Adelaide Strikers will take place at Adelaide Oval on Friday.