Grafton, WI Weather & Growing Conditions
Tonight
56°F
Light Rain
Rain. Cloudy, with a low around 56. South wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Light Rain | 10 mph S | 83% |
| Wednesday | 62°F | Light Rain Likely then Cloudy | 10 to 15 mph S | 58% |
| Wednesday Night | 47°F | Cloudy then Slight Chance Light Rain | 15 mph SW | 16% |
| Thursday | 54°F | Cloudy then Chance Light Rain | 10 to 15 mph W | 51% |
| Thursday Night | 39°F | Light Rain Likely | 5 to 15 mph NW | 63% |
| Friday | 49°F | Chance Light Rain | 10 to 20 mph N | 32% |
| Friday Night | 34°F | Mostly Cloudy | 5 to 10 mph N | 8% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph NW | 4% |
| Saturday Night | 35°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 NW | 7% |
| Monday | 57°F | Mostly Sunny | 5 to 15 mph W | 3% |
| Monday Night | 40°F | Partly Cloudy | 10 mph W | 2% |
| Tuesday | 57°F | Sunny | 5 to 10 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grafton, WI
Last spring frost
Apr 23
First fall frost
Oct 24
Growing season
182 days
Hardiness zone
6a
Explore more for Grafton, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Grafton Wwtp, Wi (2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.