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
83°F
Partly Sunny then Chance Showers And Thunderstorms
A slight chance of rain showers between 3pm and 4pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. Southwest wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 10 mph SW | 25% |
| Tonight | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 91% |
| Wednesday | 74°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 5 mph W | 60% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 33% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 16% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 6% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 62°F | Mostly Clear | 5 mph SW | 5% |
| Saturday | 84°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 31% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 10 mph SW | 31% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 48% |
| Monday | 83°F | Chance Rain Showers | 5 mph SW | 46% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph NW | 43% |
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 Aug 4, 2026.