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

Tonight: Mostly clear, with a low around 55. Light northwest wind.
Mostly Clear

 Juneteenth

Juneteenth: A 20 percent chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 80. Calm wind becoming west 5 to 8 mph in the afternoon.
Sunny then
Slight Chance
T-storms
 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 60. North wind 5 to 7 mph becoming light and variable after midnight.
Slight Chance
T-storms
 Saturday

Saturday: Sunny, with a high near 81. North northeast wind 3 to 5 mph.
Sunny

 Saturday
Night
Saturday Night: Showers, with thunderstorms also possible after 4am. Low around 60. East wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Chance
Showers then
Showers
 Sunday

Sunday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Some of the storms could produce heavy rainfall. High near 72. Breezy. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Breezy
 Sunday
Night
Sunday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 56. Breezy.
Chance
Showers and
Breezy
 Monday

Monday: Partly sunny, with a high near 74.
Partly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 55.
Partly Cloudy
Lo 55 °F Hi 80 °F Lo 60 °F Hi 81 °F Lo 60 °F Hi 72 °F Lo 56 °F Hi 74 °F Lo 55 °F

Hazardous Weather Outlook
 

Tonight
 
 Mostly clear, with a low around 55. Light northwest wind.
Juneteenth
 
 A 20 percent chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 80. Calm wind becoming west 5 to 8 mph in the afternoon.
Friday Night
 
 A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 60. North wind 5 to 7 mph becoming light and variable after midnight.
Saturday
 
 Sunny, with a high near 81. North northeast wind 3 to 5 mph.
Saturday Night
 
 Showers, with thunderstorms also possible after 4am. Low around 60. East wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
 
 Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Some of the storms could produce heavy rainfall. High near 72. Breezy. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
 
 A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 56. Breezy.
Monday
 
 Partly sunny, with a high near 74.
Monday Night
 
 Partly cloudy, with a low around 55.
Tuesday
 
 Mostly sunny, with a high near 78.
Tuesday Night
 
 Partly cloudy, with a low around 59.
Wednesday
 
 Sunny, with a high near 79.
Wednesday Night
 
 Mostly clear, with a low around 57.
Thursday
 
 Mostly sunny, with a high near 78.

 

Forecast from NOAA-NWS for Altoona IA.