Here's an article about growing tomatoes in the desert
https://ag.arizona.edu/maricopa/garden/h ... tiful.html
note it suggests growing in morning sun only location, with 50% shade cloth, mulched heavily and still it says
Generally, it is said that flowers do not set fruit when temperatures are below 55Â°F or above 90Â°F. However, I have had abundant tomato production all summer long when growing smaller varieties, cherries and yellow pears, in heavily mulched soil under 50% shade cloth. Indeterminate plants that have stopped or slowed production in the hot summer temperatures will often become productive again when the weather cools in September and October, so don't give up on them when they look half-dead in August!