Mercer, WI Weather & Growing Conditions
Today
60°F
Light Rain
Rain and patchy fog. Cloudy. High near 60, with temperatures falling to around 56 in the afternoon. South wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Light Rain | 5 mph S | 83% |
| Tonight | 38°F | Light Rain | 5 to 15 mph W | 87% |
| Thursday | 43°F | Light Rain then Slight Chance Rain And Snow | 15 mph N | 85% |
| Thursday Night | 23°F | Chance Rain And Snow | 5 to 15 mph N | 30% |
| Friday | 40°F | Partly Sunny | 5 to 10 mph N | 8% |
| Friday Night | 21°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 43°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 25°F | Partly Cloudy | 5 mph W | 10% |
| Sunday | 48°F | Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Sunday Night | 27°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Monday | 53°F | Partly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 30°F | Partly Cloudy | 5 to 10 mph W | 4% |
| Tuesday | 50°F | Slight Chance Light Rain then Mostly Sunny | 5 to 10 mph NW | 15% |
| Tuesday Night | 27°F | Mostly Cloudy | 0 to 5 mph W | 8% |
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 Nov 4, 2026.