Lake Mills, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Mills, a city in Jefferson County, Wisconsin.
This Afternoon
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then showers and thunderstorms likely between 3pm and 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and thunderstorms likely. Cloudy, with a high near 67. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Chance Showers And Thunderstorms | 5 mph E | 80% |
| Tonight | 60°F | Showers And Thunderstorms | 5 to 10 mph NE | 83% |
| Sunday | 66°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 25% |
| Sunday Night | 53°F | Mostly Cloudy | 10 to 15 mph NE | 10% |
| Monday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 26% |
| Monday Night | 48°F | Chance Rain Showers | 5 to 10 mph NE | 26% |
| Tuesday | 61°F | Chance Rain Showers | 5 to 15 mph NE | 26% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 5% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 7% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NE | 7% |
| Friday | 71°F | Partly Sunny | 0 to 5 mph NE | 7% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 7% |
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 Sep 19, 2026.