Brookfield, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brookfield, a city in Waukesha County, Wisconsin.
This Afternoon
70°F
Light Rain Likely
Rain before 3pm, then rain likely and a slight chance of thunderstorms. Cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Brookfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Light Rain Likely | 15 mph S | 95% |
| Tonight | 57°F | Light Rain | 10 to 15 mph S | 87% |
| Wednesday | 63°F | Light Rain | 10 to 15 mph S | 82% |
| Wednesday Night | 47°F | Chance Light Rain | 10 to 15 mph SW | 36% |
| Thursday | 55°F | Light Rain Likely | 5 to 15 mph W | 61% |
| Thursday Night | 42°F | Chance Light Rain | 5 mph NW | 38% |
| Friday | 52°F | Chance Light Rain | 10 mph N | 27% |
| Friday Night | 37°F | Mostly Cloudy | 0 to 10 mph N | 9% |
| Saturday | 51°F | Partly Sunny | 0 to 5 mph NW | 6% |
| Saturday Night | 35°F | Partly Cloudy then Slight Chance Light Rain | 0 to 5 mph W | 15% |
| Sunday | 54°F | Mostly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Sunday Night | 36°F | Partly Cloudy | 5 mph W | 9% |
| Monday | 56°F | Mostly Sunny | 5 to 10 mph W | 4% |
| Monday Night | 38°F | Mostly Clear | 5 mph W | 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 Nov 3, 2026.