Black River Falls, WI Weather & Growing Conditions
Today
80°F
Patchy Fog then Slight Chance Showers And Thunderstorms
Patchy fog before 8am, then patchy fog and a chance of showers and thunderstorms between 8am and noon, then a slight chance of showers and thunderstorms between noon and 5pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 76 in the afternoon. West wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 5 to 8 mph W | 42% |
| Tonight | 56°F | Showers And Thunderstorms Likely | 2 to 6 mph W | 66% |
| Wednesday | 80°F | Mostly Sunny | 1 to 5 mph NW | 1% |
| Wednesday Night | 51°F | Mostly Clear | 0 to 3 mph SW | 0% |
| Thursday | 85°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 57°F | Mostly Clear | 3 mph SW | 0% |
| Friday | 88°F | Sunny | 2 to 8 mph SW | 6% |
| Friday Night | 62°F | Slight Chance Showers And Thunderstorms | 2 to 8 mph SW | 20% |
| Saturday | 88°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 15% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 39% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 2 to 7 mph W | 39% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 1 to 6 mph SW | 38% |
| Monday | 86°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 5 mph SE | 32% |
| Monday Night | 62°F | Slight Chance Showers And Thunderstorms | 3 mph NE | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Black River Falls, WI
Last spring frost
May 9
First fall frost
Oct 1
Growing season
143 days
Hardiness zone
4b
Explore more for Black River Falls, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Blair, Wi (22.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.