Waukesha, WI Weather & Growing Conditions
Tonight
61°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 61. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Showers And Thunderstorms | 5 to 10 mph NE | 86% |
| Sunday | 65°F | Showers And Thunderstorms Likely then Mostly Cloudy | 10 to 15 mph NE | 55% |
| Sunday Night | 53°F | Mostly Cloudy | 10 to 15 mph NE | 3% |
| Monday | 61°F | Mostly Cloudy | 10 to 15 mph NE | 6% |
| Monday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 19% |
| Tuesday | 60°F | Slight Chance Rain Showers | 5 to 15 mph NE | 19% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 62°F | Partly Sunny | 5 to 10 mph NE | 8% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 10 mph NE | 4% |
| Thursday | 65°F | Partly Sunny | 0 to 5 mph NE | 2% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NE | 8% |
| Friday | 69°F | Partly Sunny | 0 to 5 mph NE | 6% |
| Friday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Saturday | 71°F | Mostly Sunny | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waukesha, WI
Last spring frost
May 1
First fall frost
Oct 13
Growing season
162 days
Hardiness zone
5b
Explore more for Waukesha, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Waukesha Wwtp, Wi (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.