Janesville, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Janesville, a city in Waseca County, Minnesota.
Overnight
47°F
Light Rain
Rain and patchy fog. Cloudy, with a low around 47. Northwest wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Janesville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Light Rain | 10 mph NW | 98% |
| Wednesday | 50°F | Drizzle then Light Rain | 10 to 15 mph W | 97% |
| Wednesday Night | 41°F | Drizzle | 10 to 15 mph WNW | 93% |
| Thursday | 48°F | Slight Chance Drizzle then Cloudy | 10 to 15 mph NNW | 18% |
| Thursday Night | 32°F | Mostly Cloudy | 5 to 10 mph N | 0% |
| Friday | 45°F | Mostly Sunny | 0 to 5 mph NNE | 1% |
| Friday Night | 28°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 48°F | Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 34°F | Mostly Clear | 5 mph WSW | 2% |
| Sunday | 53°F | Sunny | 5 mph W | 2% |
| Sunday Night | 36°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 59°F | Mostly Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph WNW | 0% |
| Tuesday | 55°F | Mostly Sunny | 0 to 5 mph WNW | 1% |
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 Nov 4, 2026.