Lake Mills, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Mills, a city in Jefferson County, Wisconsin.
Today
61°F
Cloudy then Isolated Rain Showers
Isolated rain showers after 3pm. Cloudy. High near 61, with temperatures falling to around 53 in the afternoon. Southwest wind around 15 mph.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Cloudy then Isolated Rain Showers | 15 mph SW | 12% |
| Tonight | 45°F | Chance Rain Showers | 10 to 15 mph SW | 41% |
| Thursday | 54°F | Rain Showers Likely then Chance Light Rain | 10 to 15 mph W | 63% |
| Thursday Night | 36°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 25% |
| Friday | 47°F | Partly Sunny | 5 to 15 mph N | 4% |
| Friday Night | 29°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 59°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 60°F | Sunny | 5 to 10 mph NW | 1% |
| Tuesday Night | 36°F | Partly Cloudy | 0 to 5 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Lake Mills (43.078, -88.906). Updated through the day.
Growing snapshot for Lake Mills
Last spring frost
Apr 29
First fall frost
Oct 14
Growing season
167 days
Hardiness zone
5b
More local growing data for Lake Mills: nearby ZIP 53551 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Fort Atkinson
Hebron
Helenville
Ixonia
Jefferson
Johnson Creek
Palmyra
Rome
Sullivan
Waterloo
Watertown
Climate data from the nearest NOAA station, Lake Mills Wwtp, Wi (1 mi from Lake Mills). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.