Allen, SD Weather & Growing Conditions
Overnight
30°F
Mostly Clear
Mostly clear, with a low around 30. Northwest wind around 12 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 30°F | Mostly Clear | 12 mph NW | 0% |
| Wednesday | 49°F | Partly Sunny | 10 to 16 mph NW | 1% |
| Wednesday Night | 33°F | Mostly Cloudy | 12 mph NW | 1% |
| Thursday | 51°F | Sunny | 5 to 9 mph NW | 0% |
| Thursday Night | 32°F | Partly Cloudy | 5 to 10 mph S | 0% |
| Friday | 54°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Friday Night | 35°F | Mostly Clear | 5 to 14 mph W | 0% |
| Saturday | 59°F | Sunny | 7 to 16 mph W | 0% |
| Saturday Night | 36°F | Mostly Clear | 7 to 13 mph SW | 0% |
| Sunday | 65°F | Sunny | 14 to 17 mph SW | 0% |
| Sunday Night | 43°F | Mostly Clear | 14 to 17 mph SW | 0% |
| Monday | 60°F | Sunny | 5 to 14 mph NW | 0% |
| Monday Night | 39°F | Partly Cloudy | 5 to 12 mph W | 0% |
| Tuesday | 61°F | Mostly Sunny | 7 to 15 mph S | 1% |
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 Nov 4, 2026.