Superior Electric Beach/Outdoors Report. Here are the current conditions for the Lake Michigan shoreline and Mason County (including Pentwater) as of 11 a.m. today. Lake Michigan water temperatures: Ludington Stearns Park: 57 F Ludington State Park (Big Sable Point): 57 F Summit Park: 58 F Pentwater: 58 F Afternoon air temperatures: Ludington and Pentwater: Partly sunny with high temperatures reaching 79…