National Weather Service Forecast for: Waterloo IA
Issued by: National Weather Service Des Moines, IA
Updated: 8:07 pm CDT Jun 18, 2026
 
Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 53. Light west northwest wind.
Slight Chance
T-storms then
Mostly Clear
 Juneteenth

Juneteenth: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 78. Light west northwest wind becoming west 5 to 10 mph in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunny then
Chance
T-storms
 Friday
Night
Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 57. West wind 5 to 9 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Partly Cloudy
 Saturday

Saturday: Sunny, with a high near 79. Northwest wind 3 to 6 mph.
Sunny

 Saturday
Night
Saturday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 59. Calm wind becoming east 5 to 7 mph after midnight. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Chance
Showers
 Sunday

Sunday: Showers, with thunderstorms also possible after 10am. High near 71. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Showers

 Sunday
Night
Sunday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 55. Breezy.
Chance
Showers and
Breezy
 Monday

Monday: Partly sunny, with a high near 75.
Partly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 54.
Partly Cloudy
Lo 53 °F Hi 78 °F Lo 57 °F Hi 79 °F Lo 59 °F Hi 71 °F Lo 55 °F Hi 75 °F Lo 54 °F

Hazardous Weather Outlook
 

Tonight
 
 A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 53. Light west northwest wind.
Juneteenth
 
 A 30 percent chance of showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 78. Light west northwest wind becoming west 5 to 10 mph in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 57. West wind 5 to 9 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 Sunny, with a high near 79. Northwest wind 3 to 6 mph.
Saturday Night
 
 A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 59. Calm wind becoming east 5 to 7 mph after midnight. New precipitation amounts of less than a tenth of an inch possible.
Sunday
 
 Showers, with thunderstorms also possible after 10am. High near 71. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Sunday Night
 
 A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 55. Breezy.
Monday
 
 Partly sunny, with a high near 75.
Monday Night
 
 Partly cloudy, with a low around 54.
Tuesday
 
 Mostly sunny, with a high near 77.
Tuesday Night
 
 A 40 percent chance of showers. Partly cloudy, with a low around 57.
Wednesday
 
 Mostly sunny, with a high near 78.
Wednesday Night
 
 Mostly clear, with a low around 56.
Thursday
 
 Sunny, with a high near 78.

 

Forecast from NOAA-NWS for Waterloo IA.