Opal, SD Weather Forecast
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| LATE THIS AFTERNOON | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
| Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Sunny | Mostly Clear | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Chance of Showers |
| Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 89°FHi: 32°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 50°FLo: 10°C |
| POP: 20% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 417 PM MDT Sun Sep 06 2026 

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Issued: 1227 PM MDT Sun Sep 6 2026
Key Messages
- Above average temperatures remain in the start of the forecast. Afternoon temps will be in the upper 80s to 90s for Monday but cooler temps expected midweek.
- Elevated fire weather conditions linger.
- Isolated to scattered thunderstorms are expected through Monday morning.
Discussion
...(This Evening Through Sunday) Issued at 1202 PM MDT Sun Sep 6 2026
A change in the winds is coming to the area this week. The last couple of days, we have been under the influence of a large upper level ri...
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