Weather WorldJohnson Dam, SD Weather Forecast
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Johnson Dam Weather Forecast
| THIS AFTERNOON | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
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| Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Clearing | Mostly Clear | Clearing | Partly Cloudy |
| Hi: 59°FHi: 15°C | Lo: 29°FLo: -2°C | Hi: 45°FHi: 7°C | Lo: 25°FLo: -4°C | Hi: 49°FHi: 9°C | Lo: 29°FLo: -2°C | Hi: 49°FHi: 9°C | Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C | Lo: 30°FLo: -1°C | Hi: 59°FHi: 15°C | Lo: 31°FLo: -1°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 137 PM MST Wed Nov 11 2026 
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Issued: 1235 PM MST Wed Nov 11 2026
Key Messages
- Areas of fog and low clouds late tonight into Thursday morning across western SD.
- Mild and dry into next week, breezy at times.
Discussion
...(This Evening Through Wednesday) Issued at 1233 PM MST Wed Nov 11 2026
Upper air analysis shows upper ridging over the western third of the CONUS, with northwest flow continuing across the northern Plains. Surface analysis shows a stalled frontal boundary sitting roughly near the eastern CWA border. Temperatures across the NE WY/Wrn SD plains have...