I use ice in a baggie to cool the solutions to around 75F; Dr. Richard Henry found a significant increase in apparent graininess with several films at 77F+ development temperature, and I've seen it quite a few times.(posted 8746 days ago)I can't do anything about the wash water temperature; in summer here it's around 80F or so. So often I'll develop the film at 75F, stop it at 76F or so, fix it at 78F, HCA at room temp which is usually around 80F etc.
At any rate, with modern prehardened films and occasional unintended large temperature shocks I've never managed to reticulate or damage the emulsion.