Janesville, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Janesville, a city in Waseca County, Minnesota.
Overnight
58°F
Chance Light Rain
A chance of rain. Cloudy, with a low around 58. East wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Janesville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Chance Light Rain | 10 mph E | 34% |
| Saturday | 62°F | Chance Light Rain then Chance Drizzle | 5 to 10 mph NE | 31% |
| Saturday Night | 56°F | Cloudy | 10 mph NNE | 9% |
| Sunday | 67°F | Partly Sunny | 10 to 15 mph NE | 2% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph ENE | 6% |
| Monday | 61°F | Mostly Cloudy | 5 to 10 mph ENE | 12% |
| Monday Night | 44°F | Mostly Cloudy | 5 mph ENE | 9% |
| Tuesday | 62°F | Mostly Sunny | 5 mph E | 3% |
| Tuesday Night | 42°F | Mostly Clear | 5 mph ESE | 1% |
| Wednesday | 65°F | Sunny | 5 mph SE | 2% |
| Wednesday Night | 48°F | Mostly Clear | 5 mph SE | 9% |
| Thursday | 66°F | Mostly Sunny | 5 mph SSE | 10% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph SE | 7% |
| Friday | 69°F | Mostly Sunny | 5 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Janesville (44.120, -93.710). Updated through the day.
Growing snapshot for Janesville
Last spring frost
May 2
First fall frost
Oct 4
Growing season
155 days
Hardiness zone
5a
More local growing data for Janesville: nearby ZIP 56048 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Waseca S Rsch & Outreach Ctr, Mn (9.4 mi from Janesville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.