The weather for the Labor Day weekend looks "mostly" nice. If you are considering boating here's the Utah State Parks current reservoir conditions as of August 25:
Some reservoir have low water- watch for underwater hazards. Most state parks have plenty of water for launching and boating.
Bear Lake State Park Marina: Launch Ramp OPEN/70 degrees
Bear Lake First Point: Launch Ramp OPEN/70 degrees
Bear Lake Rainbow Cove: Launch Ramp OPEN/70 degrees
Bear Lake Rendezvous Beach: Launch Ramp CLOSED/low water levels
Deer Creek State Park: Launch Ramp OPEN/68 degrees 60% full *Island ramp is very shallow- go slow and watch your propeller; plenty of water at main ramp<