Lake Mills, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Mills, a city in Winnebago County, Iowa.
Today
71°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy, with a high near 71. North northwest wind 7 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Showers And Thunderstorms Likely | 7 to 10 mph NNW | 60% |
| Tonight | 55°F | Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph NW | 38% |
| Wednesday | 72°F | Partly Sunny | 2 mph N | 1% |
| Wednesday Night | 53°F | Mostly Clear | 2 mph SSE | 1% |
| Thursday | 77°F | Sunny | 2 to 7 mph S | 1% |
| Thursday Night | 59°F | Mostly Clear | 7 mph S | 3% |
| Friday | 81°F | Sunny | 6 to 12 mph S | 10% |
| Friday Night | 63°F | Slight Chance Showers And Thunderstorms | 6 to 10 mph S | 21% |
| Saturday | 83°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 15% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 10 mph SW | 36% |
| Sunday | 83°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SSE | 36% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 34% |
| Monday | 82°F | Chance Showers And Thunderstorms | 10 mph E | 34% |
| Monday Night | 65°F | Slight Chance Showers And Thunderstorms | 9 mph ENE | 35% |
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 Aug 4, 2026.