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Grissom Arb Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  |  |  |  |  | | |  |  |
| Sunny | Partly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Sunny | Partly Cloudy | Clearing | Mostly Clear |
| Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 41°FLo: 5°C |
| POP: 20% | POP: 50% | POP: 90% | POP: 90% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 413 PM EDT Tue Sep 29 2026 
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Issued: 712 PM EDT Tue Sep 29 2026
Key Messages
- Increasing chances (40-80%) for showers Wednesday along and north of US 24 , best potential near Lake MI in the mid-late afternoon. Highs will be in the upper 60s, low 70s for those areas. South of US 24 expect highs in the mid-upper 70s with increasing clouds.
- Rain chances (40-90%) spread eastward through Friday, with isolated thunderstorm potential (non-severe). Highs will be in the 70s, low 80s on Thursday and the 60s Friday.
- Dry conditions are expected this weekend into early nex...