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Grimes, IA Weather Forecast
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| REST OF TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 70°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 65°FHi: 18°C | Lo: 61°FLo: 16°C | Hi: 65°FHi: 18°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C |
| POP: 50% | POP: 40% | POP: 50% | POP: 50% | POP: 70% | POP: 50% | POP: 50% | POP: 60% | POP: 50% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1037 PM CDT Wed Sep 16 2026 
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Issued: 1117 PM CDT Wed Sep 16 2026
Key Messages
- Storms develop late tonight/after midnight with locally heavy rainfall possible. Soils are saturated leaving more susceptibility to flash flooding so Flood Watch is in effect for areas along and south of Highway 30 through Thursday morning.
- Fog, some dense, is expected tonight into Thursday morning.
- A break in the rain is expected from late Thursday morning through a good portion of the evening before storms return after midnight. Highest rainfall expected over northern Iowa.
- Scatter...