Very uncomfortable weather

Today is a hot, humid day, the worst so far this summer.  Some thunder storms may roll in later.  Hmm, the actually humidity is 70% and the temperature 91 F, so the heat index is 109, swell. You can look up a chart to figure the index out. The kitty girls are used to lounging in north window sills, but under these conditions the windows will stay closed.  TPP got caught up on lawn mowing this morning when it was somewhat cooler. The crab grass is trying to take over the world along with a number of other summer weeds. This is when mulching earlier in the year will pay off. 
Our house handles the heat fairly well, but it has limitations. When the night time temperature drops into the low 70s or upper 60s, the house will stay comfortable without AC. But under these conditions the low tonight will probably be in the upper 70s.  The house is massive, white, and well-shaded for much of the day. It has good flow through ventilation and a lot of rooms have ceiling fans.  An evaluation for solar power came out as are you kidding?  So the economics may not work out so well for us although the shading is nice. Our electrical usage is below average anyways. 
TPP must venture out again soon because even though it's hot out there several plants may need water especially those in pots or planters, or those that are just newly planted period.