Mercer, WI Weather & Growing Conditions
Today
60°F
Chance Rain Showers
A chance of rain showers. Cloudy, with a high near 60. East wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Chance Rain Showers | 5 mph E | 28% |
| Tonight | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph NE | 16% |
| Sunday | 61°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Sunday Night | 35°F | Mostly Cloudy | 5 to 10 mph NE | 0% |
| Monday | 60°F | Partly Sunny | 5 mph E | 0% |
| Monday Night | 36°F | Partly Cloudy | 0 to 5 mph E | 0% |
| Tuesday | 65°F | Sunny | 0 to 5 mph E | 0% |
| Tuesday Night | 35°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 68°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 38°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Thursday | 69°F | Mostly Sunny | 0 to 5 mph SE | 2% |
| Thursday Night | 40°F | Partly Cloudy | 0 mph | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph S | 3% |
| Friday Night | 42°F | Partly Cloudy | 0 to 5 mph SE | 4% |
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 (12.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.