Metro Detroit weather: Another chilly night, then another Sun day, 09/19/2020, 11 p.m. update

Saturday night lows will range from near or a little above 40 degrees (5 degrees Celsius) in our Urban Heat Island, to mid-to-upper 30s (1 to 4 degrees Celsius) in areas away from the city and inland from the Great Lakes. A Frost Advisory has been posted for the I-69 corridor and northward, as this area has the best chance to see some frost overnight, although patchy frost is possible farther south in rural areas.