Decorah, IA Weather & Growing Conditions
Tonight
52°F
Rain Showers
Rain showers. Cloudy. Low around 52, with temperatures rising to around 55 overnight. Southeast wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Rain Showers | 7 to 10 mph SE | 92% |
| Wednesday | 55°F | Rain Showers | 8 to 15 mph SW | 75% |
| Wednesday Night | 45°F | Rain Showers | 15 mph W | 75% |
| Thursday | 50°F | Rain Showers | 12 mph NW | 76% |
| Thursday Night | 38°F | Mostly Cloudy | 8 to 13 mph N | 11% |
| Friday | 48°F | Partly Sunny | 3 to 9 mph N | 2% |
| Friday Night | 31°F | Partly Cloudy | 1 mph NW | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 3 mph W | 1% |
| Saturday Night | 35°F | Partly Cloudy | 5 mph W | 5% |
| Sunday | 58°F | Sunny | 7 mph W | 10% |
| Sunday Night | 37°F | Mostly Clear | 3 mph SW | 3% |
| Monday | 60°F | Mostly Sunny | 3 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 6 mph W | 1% |
| Tuesday | 58°F | Mostly Sunny | 6 mph W | 1% |
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 Nov 4, 2026.