It's 95 here in Tucson, I just got home from work and I'm going to go out and play this afternoon. I'm debating on 25ish on the road bike or 10ish riding easy single track on the mtn bike. 95 is getting towards my upper end, but on the positive side there's not much humidity right now.
Just out of idle curiosity, how hot does it have to be before you say no to a ride? Originally being from Seattle, I understand there'll be different heat thresholds.