Decorah, IA Weather & Growing Conditions
Today
76°F
Mostly Cloudy then Scattered Showers And Thunderstorms
Scattered rain showers between noon and 4pm, then scattered showers and thunderstorms. Mostly cloudy. High near 76, with temperatures falling to around 74 in the afternoon. Northwest wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Mostly Cloudy then Scattered Showers And Thunderstorms | 7 mph NW | 51% |
| Tonight | 59°F | Chance Showers And Thunderstorms | 5 mph NW | 62% |
| Wednesday | 75°F | Partly Sunny | 3 mph NW | 11% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph NW | 1% |
| Thursday | 79°F | Sunny | 3 mph SW | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 mph S | 0% |
| Friday | 82°F | Sunny | 3 to 9 mph S | 6% |
| Friday Night | 64°F | Mostly Clear | 5 to 8 mph S | 11% |
| Saturday | 83°F | Mostly Sunny | 7 mph S | 9% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 7 mph SW | 32% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 8 mph SW | 32% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 6 mph S | 39% |
| Monday | 83°F | Chance Rain Showers | 3 to 7 mph S | 39% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 3 to 7 mph NE | 33% |
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 Aug 4, 2026.