Decorah, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Decorah, a city in Winneshiek County, Iowa.
Today
77°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 7am. Mostly cloudy. High near 77, with temperatures falling to around 74 in the afternoon. West wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Decorah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Showers And Thunderstorms Likely | 8 mph W | 69% |
| Tonight | 59°F | Showers And Thunderstorms | 2 to 6 mph NW | 84% |
| Wednesday | 76°F | Partly Sunny | 3 mph NW | 12% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 3 mph NW | 1% |
| Thursday | 80°F | Sunny | 0 to 3 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 2 mph S | 0% |
| Friday | 83°F | Sunny | 1 to 8 mph S | 6% |
| Friday Night | 64°F | Mostly Clear | 3 to 7 mph S | 11% |
| Saturday | 84°F | Mostly Sunny | 3 to 7 mph S | 9% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 6 mph SW | 31% |
| Sunday | 86°F | Chance Showers And Thunderstorms | 8 mph S | 31% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 2 to 6 mph S | 40% |
| Monday | 84°F | Chance Rain Showers | 3 to 7 mph S | 40% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 3 to 7 mph NE | 34% |
Forecast source: National Weather Service (api.weather.gov) for Decorah (43.302, -91.785). Updated through the day.
Growing snapshot for Decorah
Last spring frost
May 3
First fall frost
Oct 7
Growing season
157 days
Hardiness zone
5a
More local growing data for Decorah: nearby ZIP 52101 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Decorah, Ia (4.4 mi from Decorah). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.