Brookfield, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brookfield, a city in Waukesha County, Wisconsin.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind 5 to 10 mph.
7-day forecast for Brookfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SW | 5% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 85% |
| Wednesday | 75°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph W | 74% |
| Wednesday Night | 60°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 45% |
| Thursday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 22% |
| Thursday Night | 59°F | Mostly Clear | 0 to 5 mph S | 9% |
| Friday | 82°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 63°F | Mostly Clear | 5 mph SW | 6% |
| Saturday | 84°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 28% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 28% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 52% |
| Monday | 83°F | Chance Rain Showers | 5 to 10 mph SW | 44% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph E | 42% |
Forecast source: National Weather Service (api.weather.gov) for Brookfield (43.064, -88.118). Updated through the day.
Growing snapshot for Brookfield
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
173 days
Hardiness zone
5b
More local growing data for Brookfield: nearby ZIP 53005 weather · frost dates · planting calendar · Wisconsin frost dates
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Climate data from the nearest NOAA station, Mt Mary College, Wi (3.6 mi from Brookfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.