Old Johnson School, SD Weather Forecast
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Old Johnson School Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
| Mostly Cloudy | Chance of Showers | Chance of T-Storm | Clearing | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of T-Storm | Clearing | Partly Cloudy | Clearing | Chance of T-Storm |
| Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C |
| POP: 40% | POP: 70% | POP: 20% | POP: 40% | POP: 20% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 622 AM MDT Tue Sep 22 2026 

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Issued: 520 AM MDT Tue Sep 22 2026
Key Messages
- Showers have tapered off with lingering low clouds/fog developing.
- Overall drier weather expected for the rest of the week, but southwest flow aloft will bring some chances for showers and thunderstorms.
- Breezy/windy spots Tuesday/Wednesday
Discussion
...(This Evening Through Monday) Issued at 109 PM MDT Mon Sep 21 2026
19z surface analysis had sprawling high pressure over the Great Lakes into the northern Plains bringing low-level easterly component to boundary layer flow. Water vapour...
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