Hanover, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hanover, a community in Rock County, Wisconsin.
Tonight
60°F
Chance Showers And Thunderstorms
A slight chance of rain showers before 10pm, then a chance of showers and thunderstorms between 10pm and 2am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 60. East wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Hanover
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Chance Showers And Thunderstorms | 10 mph E | 89% |
| Saturday | 74°F | Showers And Thunderstorms | 10 mph SE | 92% |
| Saturday Night | 60°F | Showers And Thunderstorms | 5 to 10 mph NE | 80% |
| Sunday | 66°F | Rain Showers Likely | 15 mph NE | 55% |
| Sunday Night | 53°F | Chance Rain Showers then Mostly Cloudy | 15 mph NE | 37% |
| Monday | 62°F | Chance Rain Showers | 15 mph NE | 37% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 37% |
| Tuesday | 61°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 27% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Wednesday | 64°F | Mostly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 66°F | Partly Sunny | 5 mph NE | 7% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 68°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Hanover (42.639, -89.171). Updated through the day.
Growing snapshot for Hanover
Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
5b
More local growing data for Hanover: nearby ZIP 53537 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Brodhead
Clinton
Edgerton
Evansville
Footville
Fulton
Janesville
Lake Koshkonong
Milton
Orfordville
Shopiere
Climate data from the nearest NOAA station, Afton - Janesville Wwtp, Wi (7.8 mi from Hanover). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.