Allen, SD Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Allen Weather Forecast
| OVERNIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
| Thunderstorms | Chance of T-Storm | Mostly Clear | Mostly Sunny | Showers Likely | Chance of Showers | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers |
| Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C |
| POP: 70% | POP: 40% | POP: 70% | POP: 20% | POP: 20% | POP: 30% | POP: 60% | POP: 40% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1147 PM MDT Sun Sep 13 2026 

Allen Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Allen Weather Map
Allen Quick Facts
Allen Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1047 PM MDT Sun Sep 13 2026
Key Messages
- Passing showers and storms still look likely overnight.
- Becoming windy on Monday, especially across the northwest.
- Fire weather concerns on Monday are the wildcard across the northwest.
Discussion
...(This Evening Through Sunday) Issued at 1232 PM MDT Sun Sep 13 2026
Latest water vapor imagery shows 500hpa low spinning across southern WA state with ridging setting up from eastern MT into eastern CO. Upper flow across the Dakotas has turned more northwesterly with broad cyclonic flow set...
Weather World