PARALYMPICS: Fresh from his silver in the 100m in the T34 class, Bundaberg's Rheed McCracken has now qualified for the 800m final at the Rio Games.

Battling temperatures that almost reached 40 degrees, McCracken put in a great performance as he battled Walid Ktila again in the first heat.

After a poor start, McCracken powered past Ktila with 100m to go and was on the verge of the heat win before the world record holder in the event just pipped him at the line.

The margin in the end was just 0.03 seconds as the 19-year-old finished second with a 1:46.31 to also record a season best time.

It was also good enough to finish third overall, as he qualified for the final.

Conceding he was still a bit sore from the 100m final, McCracken told Channel 7 he was pumped with the time.

"It's warm out here today but I was really happy with that," he said.

"I surprised myself after (the 100m final) last night as I was feeling a bit heavy in the arm."

McCracken said he also threw caution to the wind in the race.

"Walid opened the door for me in the last 150m and I though I might as well have a dig and see how it goes," he said.

"I had a bit of a slow start, but just really happy with that. I don't know how else to put it."

McCracken will now rest and recuperate before competing in the final tomorrow morning at 6.50am Queensland time.

He is aiming for his fourth Paralympic's medal.