National Weather Service Forecast for: Waterloo IA
Issued by: National Weather Service Des Moines, IA
Updated: 11:46 am CDT Mar 19, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 59. Light and variable wind.
Sunny

 Tonight

Tonight: Partly cloudy, with a low around 42. South wind 6 to 8 mph becoming west southwest after midnight.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 67. North northwest wind around 8 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly cloudy, with a low around 41. North wind around 5 mph becoming light and variable.
Mostly Cloudy

 Saturday

Saturday: Sunny, with a high near 77. South southwest wind 6 to 10 mph.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 57. Breezy.
Partly Sunny
and Breezy

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 29. Blustery.
Partly Cloudy
and Blustery
then Mostly
Clear
 Monday

Monday: Mostly sunny, with a high near 47.
Mostly Sunny
Hi 59 °F Lo 42 °F Hi 67 °F Lo 41 °F Hi 77 °F Lo 50 °F Hi 57 °F Lo 29 °F Hi 47 °F

 

This Afternoon
 
 Sunny, with a high near 59. Light and variable wind.
Tonight
 
 Partly cloudy, with a low around 42. South wind 6 to 8 mph becoming west southwest after midnight.
Friday
 
 Mostly sunny, with a high near 67. North northwest wind around 8 mph.
Friday Night
 
 Mostly cloudy, with a low around 41. North wind around 5 mph becoming light and variable.
Saturday
 
 Sunny, with a high near 77. South southwest wind 6 to 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 50.
Sunday
 
 Partly sunny, with a high near 57. Breezy.
Sunday Night
 
 Partly cloudy, with a low around 29. Blustery.
Monday
 
 Mostly sunny, with a high near 47.
Monday Night
 
 Mostly cloudy, with a low around 34.
Tuesday
 
 Mostly cloudy, with a high near 55.
Tuesday Night
 
 Mostly cloudy, with a low around 37.
Wednesday
 
 Partly sunny, with a high near 63.

 

Forecast from NOAA-NWS for Waterloo IA.