Here's an interesting answer from Clorox.com. It's wrong where it says bleaching "in the hottest water possible will give you the best cleaning and whitening." The same paragraph says "Clorox® Regular Bleach2 should ideally be stored at room temperature (70°F) because the active ingredient in liquid bleach, sodium hypochlorite, is very sensitive to high heat storage conditions."
The CDC says "too great an increase in temperature causes the disinfectant to degrade and weakens its germicidal activity and thus might produce a potential health hazard." That's not just about storage. It's about "disinfectant procedures: temperature, pH, relative humidity, and water hardness." It's not specific though, and the section on Chlorine and Chlorine Compounds doesn't address this.
This is pretty good though:
"Aqueous hypochlorite solutions of 1, 2.62, and 5.25% kept 100% of their available chlorine at 20, 45, and 60°C [140 F] during the whole experimental period (60 min)."
Sirtes G, Waltimo T, Schaetzle M, Zehnder M. The Effects of Temperature on Sodium Hypochlorite Short-Term Stability, Pulp Dissolution Capacity, and Antimicrobial Efficacy. J Endod. 2005;31(9) 669-671
But water temperatures over 140 F weren't tested.