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Altoona, IA Weather Forecast
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Altoona Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  | |  |  | | | | | | |
| Chance of T-Storm | Mostly Sunny | Partly Cloudy | Sunny | Mostly Clear | Chance of T-Storm | Mostly Clear | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C |
| POP: 20% | POP: 20% | POP: 20% | POP: 20% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 128 AM CDT Tue Sep 01 2026 
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Issued: 207 AM CDT Tue Sep 1 2026
Key Messages
- Hot and humid conditions will continue through the week, especially over southern Iowa where heat index values will peak around 100 degrees each day. A Heat Advisory remains in effect for portions of southern Iowa through Wednesday afternoon.
- Thunderstorms will be possible at times for the next several days. Any storms today will be very isolated and rain chances are 20% or less. Tonight thunderstorms will be more likely in northern Iowa, close to the Minnesota border, where severe w...