Weather WorldDewey County, SD Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Dewey County Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
 |  | | | |  |  | | | |  |
| Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Hi: 69°FHi: 21°C Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Hi: 59°FHi: 15°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1107 AM MDT Mon Oct 05 2026 
Dewey County Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Dewey County Weather Map
Dewey County Quick Facts
Dewey County Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1227 PM CDT Mon Oct 5 2026
Key Messages
- Above normal temperatures today and Tuesday, with highs in the 70s to low 80s, about 15 to 20 degrees above normal.
- Temperatures about 10 degrees above normal for the rest of the work week, with dry conditions persisting.
Discussion
... Issued at 1225 AM CDT Mon Oct 5 2026
Warm advection mid clouds developing on satellite, and forecast in soundings/NBM sky cover. Only about 50mb thickness at around 700mb, so will have a limited impact on the forecast aside from less than full sunshine f...