Allen, SD Weather & Growing Conditions
Tonight
56°F
Patchy Fog
Patchy fog after 10pm. Cloudy. Low around 56, with temperatures rising to around 58 overnight. Northeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Patchy Fog | 7 mph NE | 7% |
| Saturday | 65°F | Chance Rain Showers | 6 to 10 mph NE | 30% |
| Saturday Night | 53°F | Showers And Thunderstorms Likely | 12 mph E | 74% |
| Sunday | 60°F | Rain Showers | 9 to 13 mph E | 98% |
| Sunday Night | 50°F | Showers And Thunderstorms | 9 to 14 mph NE | 96% |
| Monday | 62°F | Chance Rain Showers | 9 to 13 mph NE | 43% |
| Monday Night | 49°F | Mostly Cloudy | 15 mph SE | 12% |
| Tuesday | 69°F | Slight Chance Rain Showers then Partly Sunny | 15 to 22 mph S | 15% |
| Tuesday Night | 55°F | Partly Cloudy | 22 mph S | 14% |
| Wednesday | 75°F | Mostly Sunny | 15 to 22 mph S | 13% |
| Wednesday Night | 56°F | Slight Chance Rain Showers then Partly Cloudy | 14 mph S | 21% |
| Thursday | 76°F | Mostly Sunny | 10 mph S | 7% |
| Thursday Night | 56°F | Partly Cloudy | 8 to 15 mph SE | 8% |
| Friday | 77°F | Mostly Sunny | 15 to 18 mph S | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Allen, SD
Last spring frost
May 13
First fall frost
Oct 2
Growing season
141 days
Hardiness zone
5a
Explore more for Allen, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Martin, Sd (13.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.