Janesville, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Janesville, a city in Waseca County, Minnesota.
Today
71°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a high near 71. Northwest wind around 10 mph. Chance of precipitation is 50%.
7-day forecast for Janesville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Chance Showers And Thunderstorms | 10 mph NW | 48% |
| Tonight | 54°F | Mostly Cloudy | 0 to 5 mph NW | 14% |
| Wednesday | 72°F | Sunny | 0 to 5 mph WSW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 5 mph SSW | 0% |
| Thursday | 77°F | Sunny | 5 to 10 mph SSW | 1% |
| Thursday Night | 61°F | Mostly Clear | 10 mph S | 3% |
| Friday | 80°F | Sunny | 10 mph SSW | 10% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 22% |
| Saturday | 81°F | Sunny | 5 to 10 mph S | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 10 mph SSE | 45% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 45% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph E | 31% |
| Monday | 79°F | Chance Showers And Thunderstorms | 10 mph ENE | 31% |
| Monday Night | 65°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 22% |
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 Aug 4, 2026.