Iroquois, SD Weather & Growing Conditions
This Afternoon
66°F
Patchy Fog
Patchy fog. Cloudy, with a high near 66. East wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Patchy Fog | 5 mph E | 10% |
| Tonight | 58°F | Patchy Fog | 5 to 10 mph NE | 12% |
| Saturday | 67°F | Patchy Fog then Cloudy | 10 mph NNE | 7% |
| Saturday Night | 54°F | Mostly Cloudy | 5 to 10 mph NE | 2% |
| Sunday | 64°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph ENE | 35% |
| Sunday Night | 51°F | Chance Rain Showers | 10 mph ENE | 52% |
| Monday | 62°F | Chance Rain Showers | 10 mph E | 52% |
| Monday Night | 47°F | Mostly Cloudy | 5 to 10 mph E | 6% |
| Tuesday | 66°F | Partly Sunny | 5 to 10 mph SE | 2% |
| Tuesday Night | 50°F | Mostly Cloudy | 10 to 15 mph SE | 4% |
| Wednesday | 68°F | Partly Sunny | 15 mph SSE | 11% |
| Wednesday Night | 53°F | Chance Rain Showers | 10 mph SSE | 35% |
| Thursday | 69°F | Slight Chance Showers And Thunderstorms | 10 mph SSE | 35% |
| Thursday Night | 54°F | Mostly Cloudy | 5 to 10 mph SE | 10% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Iroquois, SD
Last spring frost
May 5
First fall frost
Oct 4
Growing season
151 days
Hardiness zone
4b
Explore more for Iroquois, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, De Smet, Sd (14.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.