Mercer, WI Weather & Growing Conditions
Today
75°F
Chance Rain Showers then Partly Sunny
A chance of rain showers before 11am. Partly sunny, with a high near 75. Heat index values as high as 75. West wind 6 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Chance Rain Showers then Partly Sunny | 6 to 10 mph W | 51% |
| Tonight | 51°F | Mostly Cloudy | 0 to 6 mph NNW | 4% |
| Wednesday | 74°F | Patchy Fog then Mostly Sunny | 0 to 6 mph WNW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 3 mph SSW | 0% |
| Thursday | 80°F | Sunny | 3 to 10 mph SW | 1% |
| Thursday Night | 59°F | Mostly Clear | 7 mph SW | 3% |
| Friday | 82°F | Sunny | 6 to 10 mph SW | 15% |
| Friday Night | 59°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 43% |
| Saturday | 79°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph WSW | 21% |
| Saturday Night | 58°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 5 mph WSW | 49% |
| Sunday | 76°F | Chance Showers And Thunderstorms | 1 to 8 mph W | 49% |
| Sunday Night | 55°F | Chance Showers And Thunderstorms | 0 to 6 mph NNW | 29% |
| Monday | 77°F | Areas Of Fog then Slight Chance Showers And Thunderstorms | 0 to 6 mph NNW | 23% |
| Monday Night | 55°F | Slight Chance Showers And Thunderstorms | 0 to 6 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mercer, WI
Last spring frost
May 25
First fall frost
Sep 21
Growing season
117 days
Hardiness zone
4a
Explore more for Mercer, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Rest Lake, Wi (1.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.