Decorah, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Decorah, a city in Winneshiek County, Iowa.
Tonight
60°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 60. East wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Decorah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Showers And Thunderstorms | 10 to 14 mph E | 99% |
| Saturday | 70°F | Showers And Thunderstorms | 5 to 10 mph SE | 79% |
| Saturday Night | 56°F | Chance Showers And Thunderstorms | 8 to 13 mph N | 36% |
| Sunday | 68°F | Slight Chance Rain Showers | 13 mph NE | 20% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph NE | 11% |
| Monday | 63°F | Chance Rain Showers | 10 mph NE | 41% |
| Monday Night | 46°F | Chance Rain Showers | 5 to 9 mph NE | 41% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 7 mph NE | 26% |
| Tuesday Night | 44°F | Partly Cloudy | 3 mph NE | 4% |
| Wednesday | 66°F | Sunny | 3 mph E | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 2 mph NE | 3% |
| Thursday | 69°F | Partly Sunny | 2 mph SE | 11% |
| Thursday Night | 50°F | Partly Cloudy | 1 mph NE | 7% |
| Friday | 71°F | Mostly Sunny | 0 to 3 mph NE | 4% |
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 Sep 19, 2026.