Temperatures tonight will drop into the upper 40s in the northeastern 1/3 of Iowa. The colder valleys may fall as low as 45 in some places. These temperatures will be within 4-8 degrees of the record low temperatures for Monday. You’ll will likely need a jacket if you’ll be out and about after sunset tonight and again tomorrow morning when you leave for work or school.

Here are the record lows and forecasted lows for Monday morning.
Cedar Rapids Record 40° Forecast 48°
Dubuque Record 42° Forecast 47°
Waterloo Record 39° Forecast 47°

Also some light fog is possible especially in the river valleys in NE Iowa.