Fort Atkinson, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fort Atkinson, a city in Winneshiek County, Iowa.
Tonight
56°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 10pm, then a chance of showers and thunderstorms. Cloudy. Low around 56, with temperatures rising to around 58 overnight. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Fort Atkinson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 27% |
| Sunday | 67°F | Slight Chance Rain Showers then Mostly Cloudy | 14 mph NE | 16% |
| Sunday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 12 mph NE | 22% |
| Monday | 60°F | Rain Showers Likely | 9 to 13 mph NE | 55% |
| Monday Night | 46°F | Rain Showers Likely | 6 to 9 mph NE | 55% |
| Tuesday | 60°F | Chance Rain Showers then Partly Sunny | 6 to 9 mph NE | 35% |
| Tuesday Night | 43°F | Partly Cloudy | 5 mph NE | 3% |
| Wednesday | 63°F | Mostly Sunny | 6 mph E | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 2 mph E | 3% |
| Thursday | 66°F | Partly Sunny | 2 mph SE | 13% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 1 mph E | 15% |
| Friday | 69°F | Partly Sunny | 0 to 3 mph E | 9% |
| Friday Night | 53°F | Mostly Cloudy | 1 mph E | 5% |
| Saturday | 69°F | Slight Chance Rain Showers | 1 to 6 mph SE | 17% |
Forecast source: National Weather Service (api.weather.gov) for Fort Atkinson (43.144, -91.934). Updated through the day.
Growing snapshot for Fort Atkinson
Last spring frost
May 3
First fall frost
Oct 7
Growing season
157 days
Hardiness zone
5a
More local growing data for Fort Atkinson: nearby ZIP 52144 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Decorah, Ia (14.1 mi from Fort Atkinson). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.