Boulder Junction, WI Weather & Growing Conditions
Today
75°F
Partly Sunny
Partly sunny. High near 75, with temperatures falling to around 73 in the afternoon. Heat index values as high as 75. West northwest wind around 8 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Partly Sunny | 8 mph WNW | 11% |
| Tonight | 50°F | Mostly Cloudy then Patchy Fog | 0 to 7 mph NNW | 2% |
| Wednesday | 75°F | Patchy Fog then Sunny | 0 to 7 mph WNW | 0% |
| Wednesday Night | 53°F | Mostly Clear | 1 to 5 mph SSW | 0% |
| Thursday | 81°F | Sunny | 5 to 12 mph SW | 0% |
| Thursday Night | 60°F | Mostly Clear | 8 mph SSW | 1% |
| Friday | 81°F | Mostly Sunny then Showers And Thunderstorms Likely | 12 mph SW | 55% |
| Friday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 to 9 mph SW | 55% |
| Saturday | 79°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph WSW | 22% |
| Saturday Night | 58°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 5 mph WSW | 50% |
| Sunday | 76°F | Chance Showers And Thunderstorms | 2 to 8 mph W | 50% |
| Sunday Night | 55°F | Chance Showers And Thunderstorms | 0 to 6 mph NNW | 29% |
| Monday | 77°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 0 to 7 mph NNW | 23% |
| Monday Night | 55°F | Slight Chance Showers And Thunderstorms | 0 to 6 mph NNW | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Boulder Junction, WI
Last spring frost
May 25
First fall frost
Sep 21
Growing season
117 days
Hardiness zone
4a
Explore more for Boulder Junction, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Rest Lake, Wi (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.