Hi from Piggley and me.
Here's info you are asking :
http://www.redearslider.com/index_habitat.htmlTemps are listed in the lighting /basking section .
Look at top header on this page , click on each topic and open all links for all the info you will need for a happy healthy long lived turtle. The more info you know now will help your "prevent " lots of issues.
With any source articles make sure you read info for your species and size , turtles have three main stages of life , hatchling , juvenile and adult , all with different requirements.