Decorah, IA Weather & Growing Conditions
Today
68°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 68, with temperatures falling to around 65 in the afternoon. Southeast wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Showers And Thunderstorms | 6 mph SE | 83% |
| Tonight | 56°F | Showers And Thunderstorms Likely | 6 to 10 mph N | 55% |
| Sunday | 66°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph NE | 16% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph NE | 12% |
| Monday | 62°F | Slight Chance Rain Showers | 9 mph NE | 23% |
| Monday Night | 45°F | Mostly Cloudy | 3 to 7 mph NE | 14% |
| Tuesday | 61°F | Mostly Sunny | 3 to 7 mph NE | 9% |
| Tuesday Night | 42°F | Mostly Clear | 1 to 5 mph NE | 2% |
| Wednesday | 65°F | Sunny | 5 mph E | 1% |
| Wednesday Night | 47°F | Mostly Clear | 2 mph E | 3% |
| Thursday | 66°F | Mostly Sunny | 0 to 3 mph E | 9% |
| Thursday Night | 49°F | Partly Cloudy | 1 mph E | 3% |
| Friday | 69°F | Mostly Sunny | 0 to 3 mph E | 6% |
| Friday Night | 50°F | Partly Cloudy | 2 mph SE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Decorah, IA
Last spring frost
May 3
First fall frost
Oct 7
Growing season
157 days
Hardiness zone
5a
Explore more for Decorah, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Decorah, Ia (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.