Lake Mills, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Mills, a city in Winnebago County, Iowa.
This Afternoon
66°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm. Cloudy. High near 66, with temperatures falling to around 61 in the afternoon. North wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Slight Chance Rain Showers | 8 mph N | 20% |
| Tonight | 56°F | Cloudy | 7 to 10 mph NNE | 13% |
| Sunday | 66°F | Mostly Cloudy | 14 mph NE | 5% |
| Sunday Night | 49°F | Cloudy then Chance Rain Showers | 10 mph ENE | 32% |
| Monday | 58°F | Rain Showers Likely | 8 to 12 mph ENE | 56% |
| Monday Night | 45°F | Rain Showers Likely then Mostly Cloudy | 5 to 8 mph NE | 56% |
| Tuesday | 59°F | Partly Sunny | 5 to 8 mph ENE | 8% |
| Tuesday Night | 43°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 63°F | Mostly Sunny | 2 to 6 mph ESE | 0% |
| Wednesday Night | 47°F | Partly Cloudy | 3 mph SE | 12% |
| Thursday | 65°F | Slight Chance Rain Showers | 2 to 7 mph SE | 20% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 1 to 5 mph SE | 16% |
| Friday | 69°F | Partly Sunny | 2 to 6 mph SE | 13% |
| Friday Night | 54°F | Mostly Cloudy | 3 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Lake Mills (43.417, -93.532). Updated through the day.
Growing snapshot for Lake Mills
Last spring frost
Apr 30
First fall frost
Oct 7
Growing season
159 days
Hardiness zone
5a
More local growing data for Lake Mills: nearby ZIP 50450 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Forest City 2 Nne, Ia (10.9 mi from Lake Mills). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.