Brillion, WI Weather & Growing Conditions
Today
83°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Partly sunny. High near 83, with temperatures falling to around 81 in the afternoon. Heat index values as high as 86. Southwest wind around 14 mph, with gusts as high as 23 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 | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 14 mph SW | 43% |
| Tonight | 63°F | Chance Showers And Thunderstorms | 3 to 10 mph W | 66% |
| Wednesday | 78°F | Chance Showers And Thunderstorms then Partly Sunny | 5 mph WNW | 48% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 5 mph SSW | 2% |
| Thursday | 80°F | Mostly Sunny | 0 to 6 mph SW | 0% |
| Thursday Night | 59°F | Mostly Clear | 6 mph S | 0% |
| Friday | 82°F | Sunny | 3 to 13 mph SW | 1% |
| Friday Night | 64°F | Mostly Clear | 8 to 12 mph SSW | 8% |
| Saturday | 84°F | Mostly Sunny | 8 to 13 mph SW | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 40% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 7 to 12 mph WSW | 40% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 5 to 9 mph W | 48% |
| Monday | 81°F | Chance Rain Showers | 5 to 8 mph S | 34% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 39% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Brillion, WI
Last spring frost
May 6
First fall frost
Oct 6
Growing season
151 days
Hardiness zone
5b
Explore more for Brillion, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Brillion, Wi (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.