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Honestly, cold water is fine, even that cold.

Here's why. First, your bungholio is one of the hottest spots on body, so while there might be a moment of surprise if the water is really cold, it will only be a moment. Then, the anus and gluteal fold aren't particularly temperature sensitive. Pressure, yes. But temperature, they just don't pick up that kind of sensation as well as even the glutes themselves. Test it some time. A splash of cold water on you butt cheeks compared to your butt hole, it just won't bother you as much on the hole.

Also, depending in how your bidet is set up, you might not ever get warm water at all. There are definitely bidets that warm the water in the bidet, but most of them just run a pipe to the pipes under a sink or wherever. Which means the warm water has to come from the heater, through the pipes, and to your poop-pipe. It only takes a few seconds for the majority of a healthy poo's worth of residue to be gone. Even less healthy, or unhealthy poos won't take minutes of time.

So, you end up with your end only experiencing the cold anyway, unless you run it to get it warm before sitting down. Which isn't a good idea for other reasons, what with the water being a mini fountain.

Plus, the cool water feels nice.