I try to get out early and will shorten my intervals if I need to.
This last weekend I was lucky to have some good cloud coverage and was rained on 2 times in a 2.5 hour ride. It was refreshing!
I live in south Florida where it has been 85° @ 80%+ humidity at 8 am. It’s not even the hot months of summer yet lol
I have this week and maybe next of a threshold block, so I’m doing my best with the heat.
After this I have a couple free weeks planned before getting into a gravel/mtb marathon specific event prep. ( SS and tempo with long rides) which should be doable.
My friends down here are a few weeks away from Mtb marathon nationals and you should see the rides they do in the heat.
Do what you can and don’t be hard on yourself.