Grafton, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grafton, a village in Ozaukee County, Wisconsin.
Tonight
57°F
Rain Showers
Rain showers. Cloudy, with a low around 57. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Grafton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Rain Showers | 10 to 15 mph S | 87% |
| Wednesday | 63°F | Rain Showers | 10 to 15 mph S | 86% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Chance Light Rain | 10 mph SW | 34% |
| Thursday | 54°F | Light Rain Likely | 5 to 10 mph W | 66% |
| Thursday Night | 39°F | Light Rain Likely | 5 to 10 mph NW | 61% |
| Friday | 49°F | Chance Light Rain | 10 to 15 mph N | 30% |
| Friday Night | 34°F | Mostly Cloudy | 5 to 10 mph N | 7% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 4% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 8% |
| Sunday | 56°F | Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Sunday Night | 36°F | Partly Cloudy | 5 mph W | 6% |
| Monday | 58°F | Mostly Sunny | 5 to 15 mph W | 3% |
| Monday Night | 40°F | Partly Cloudy | 10 mph W | 2% |
| Tuesday | 58°F | Sunny | 5 to 10 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Grafton (43.321, -87.948). Updated through the day.
Growing snapshot for Grafton
Last spring frost
Apr 23
First fall frost
Oct 24
Growing season
182 days
Hardiness zone
6a
More local growing data for Grafton: nearby ZIP 53024 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grafton Wwtp, Wi (2 mi from Grafton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.