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Grinnell High School, IA Weather Forecast
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Grinnell High School Weather Forecast
| REST OF TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 | |  |  |  |  | | | | | | |
| Patchy Fog | Patchy Fog | Clearing | Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny |
| Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C |
| POP: 30% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Wed Aug 19 2026 
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Issued: 300 AM CDT Wed Aug 19 2026
Key Messages
- Thunderstorms are expected over parts of central and southern Iowa, mainly south of Interstate 80 today into this evening. A few strong storms with large hail and damaging winds may occur. Locally heavy rainfall of 1-3 inches is possible over far southern Iowa.
- Addition storms possible Thursday night and again Friday night.
Aviation
/06Z TAFS THROUGH 06Z THURSDAY/... Issued at 1124 PM CDT Tue Aug 18 2026
VFR conditions are expected to prevail through this T...