National Weather Service Forecast for: Altoona IA
Issued by: National Weather Service Des Moines, IA
Updated: 1:31 am CDT Aug 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 62. Light northeast wind.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 81. Calm wind becoming south southeast around 6 mph in the afternoon.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 67. South southeast wind 3 to 6 mph.
Mostly Clear
 Friday

Friday: Sunny, with a high near 84. Southwest wind 6 to 8 mph becoming west northwest in the afternoon.
Sunny
 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 65. North wind 3 to 5 mph.
Slight Chance
T-storms
 Saturday

Saturday: Sunny, with a high near 80.
Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 60.
Mostly Clear
 Sunday

Sunday: Mostly sunny, with a high near 78.
Mostly Sunny
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 62.
Mostly Cloudy
Lo 62 °F Hi 81 °F Lo 67 °F Hi 84 °F Lo 65 °F Hi 80 °F Lo 60 °F Hi 78 °F Lo 62 °F

Hazardous Weather Outlook
 

Overnight
 
 Mostly clear, with a low around 62. Light northeast wind.
Thursday
 
 Sunny, with a high near 81. Calm wind becoming south southeast around 6 mph in the afternoon.
Thursday Night
 
 Mostly clear, with a low around 67. South southeast wind 3 to 6 mph.
Friday
 
 Sunny, with a high near 84. Southwest wind 6 to 8 mph becoming west northwest in the afternoon.
Friday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 65. North wind 3 to 5 mph.
Saturday
 
 Sunny, with a high near 80.
Saturday Night
 
 Mostly clear, with a low around 60.
Sunday
 
 Mostly sunny, with a high near 78.
Sunday Night
 
 Mostly cloudy, with a low around 62.
Monday
 
 Partly sunny, with a high near 77.
Monday Night
 
 Partly cloudy, with a low around 64.
Tuesday
 
 Mostly sunny, with a high near 82.
Tuesday Night
 
 Partly cloudy, with a low around 66.
Wednesday
 
 Mostly sunny, with a high near 81.

 

Forecast from NOAA-NWS for Altoona IA.