Mercer, WI Weather & Growing Conditions
Overnight
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. Low around 63, with temperatures rising to around 67 overnight. South wind around 10 mph, with gusts as high as 25 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 |
|---|---|---|---|---|
| Overnight | 63°F | Chance Showers And Thunderstorms | 10 mph S | 26% |
| Tuesday | 74°F | Chance Showers And Thunderstorms then Partly Sunny | 5 to 10 mph W | 53% |
| Tuesday Night | 50°F | Partly Cloudy | 0 to 5 mph NW | 3% |
| Wednesday | 74°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 51°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Thursday | 80°F | Sunny | 5 to 10 mph SW | 2% |
| Thursday Night | 59°F | Mostly Clear | 5 to 10 mph SW | 5% |
| Friday | 83°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 16% |
| Friday Night | 58°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 46% |
| Saturday | 79°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SW | 21% |
| Saturday Night | 57°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph SW | 49% |
| Sunday | 76°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 49% |
| Sunday Night | 55°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 27% |
| Monday | 77°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 23% |
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 Aug 4, 2026.