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Arnold Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  |  | |  |  | |  | | |
| Mostly Sunny | Clear | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm |
| Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 20% | POP: 70% | POP: 70% | POP: 50% | POP: 40% | POP: 50% | POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 502 AM EDT Tue Sep 15 2026 
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Issued: 1231 AM EDT Tue Sep 15 2026
Key Messages
1) Rain and storm chances increase late Wednesday into early Friday, highest for the day on Thursday. Low, but non-zero flood and severe weather risks are forecast.
2) A more unsettled weather pattern returns for the weekend with more rain chances and more seasonable temperatures. Uncertainty in the weather pattern increases into next week.
Discussion
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KEY MESSAGE 1... A cold front is expected to sag down into the Great Lakes region Wednesday into Friday. This will generally bring asc...