We don't get humidity here...but,90`F is very common daytime temps, 60-65 lows. Will go to 120`+ in the sun. You might try a little shade or mass plantings, so they shade/cool each other. BTW...usually 10+ on UV scale all year, too. Don't have any current knowledge, but the Mexican bagseed I did 30yrs ago, liked the sun. Grown in red clay. The soil would crack before the plants needed water.