I live in SC. Do you mean Spartanburg? I have never heard of Sparta (doesn't mean much though) and can not find it on Google maps. With that said, SC summers can be a little long and very humid. If Spartanburg is the town you are heading to, then at least you are in a higher elevation than us.
Each year is different but the last two summers recorded in Columbia SC have been 2 of the 3 hottest on record. Summer typically goes from Mid May to the end of Sept.
Hope you enjoy your time here.
PS, I lived in Longview TX for 4 years- not a whole lot of difference.