Brookfield, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brookfield, a city in Waukesha County, Wisconsin.
This Afternoon
69°F
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a high near 69. East wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Brookfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Rain Showers Likely | 10 mph E | 56% |
| Tonight | 59°F | Showers And Thunderstorms | 10 mph E | 94% |
| Saturday | 71°F | Showers And Thunderstorms | 10 to 15 mph SE | 94% |
| Saturday Night | 59°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 48% |
| Sunday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 22% |
| Monday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph NE | 15% |
| Monday Night | 50°F | Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Tuesday | 61°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 15% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 12% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 12% |
| Wednesday Night | 50°F | Mostly Cloudy | 5 mph NE | 7% |
| Thursday | 66°F | Partly Sunny | 5 mph NE | 3% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph N | 4% |
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 Sep 19, 2026.