If you're power is reliable, you can get a bilge heater. The only risk you run is power being knocked out.
Truthfully, if your daytime temps are in the 60s and nights are in the low 30s, it's not gonna harm your boat. It takes longer than you think at freezing to kill your motor. Remember, the cold needs to penetrate the entire boat, then penetrate the entire engine block in order to do harm. That's not going to happen in 1 or 2 hours of 32° temps. Put a thermometer in the bilge or the boat and you'll see what I mean.
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