National Weather Service Forecast for: Waterloo IA
Issued by: National Weather Service Des Moines, IA
Updated: 10:21 pm CST Dec 17, 2025
 
Overnight

Overnight: Rain, mainly after 1am. Temperature rising to around 39 by 4am. Breezy, with a south wind 13 to 16 mph becoming west southwest. Winds could gust as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Breezy
 Thursday

Thursday: Rain likely before 9am, then a chance of snow after noon. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 21 by 5pm. Wind chill values as low as 5. Windy, with a west southwest wind 16 to 21 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Windy. Rain
Likely then
Chance Snow
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 6. Wind chill values as low as -10. Windy, with a northwest wind 24 to 29 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 43 mph.
Mostly Cloudy
and Windy
 Friday

Friday: Mostly sunny, with a high near 29. Wind chill values as low as -10. Northwest wind 7 to 14 mph becoming south southeast in the afternoon. Winds could gust as high as 22 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly cloudy, with a low around 21. South wind 10 to 15 mph, with gusts as high as 22 mph.
Mostly Cloudy

 Saturday

Saturday: Partly sunny, with a high near 36.
Partly Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 12.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 29.
Sunny

 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 21.
Mostly Cloudy
Lo 36 °F⇑ Hi 38 °F⇓ Lo 6 °F Hi 29 °F Lo 21 °F Hi 36 °F Lo 12 °F Hi 29 °F Lo 21 °F

Wind Advisory
 

Overnight
 
 Rain, mainly after 1am. Temperature rising to around 39 by 4am. Breezy, with a south wind 13 to 16 mph becoming west southwest. Winds could gust as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
 
 Rain likely before 9am, then a chance of snow after noon. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 21 by 5pm. Wind chill values as low as 5. Windy, with a west southwest wind 16 to 21 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday Night
 
 Mostly cloudy, with a low around 6. Wind chill values as low as -10. Windy, with a northwest wind 24 to 29 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 43 mph.
Friday
 
 Mostly sunny, with a high near 29. Wind chill values as low as -10. Northwest wind 7 to 14 mph becoming south southeast in the afternoon. Winds could gust as high as 22 mph.
Friday Night
 
 Mostly cloudy, with a low around 21. South wind 10 to 15 mph, with gusts as high as 22 mph.
Saturday
 
 Partly sunny, with a high near 36.
Saturday Night
 
 Mostly clear, with a low around 12.
Sunday
 
 Sunny, with a high near 29.
Sunday Night
 
 Mostly cloudy, with a low around 21.
Monday
 
 Partly sunny, with a high near 39.
Monday Night
 
 Mostly cloudy, with a low around 30.
Tuesday
 
 Partly sunny, with a high near 40.
Tuesday Night
 
 Mostly cloudy, with a low around 24.
Wednesday
 
 Partly sunny, with a high near 38.

 

Forecast from NOAA-NWS for Waterloo IA.