Merrimac, WI Weather & Growing Conditions
Today
67°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 67. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Showers And Thunderstorms | 5 mph E | 78% |
| Tonight | 56°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 72% |
| Sunday | 66°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 30% |
| Sunday Night | 49°F | Mostly Cloudy | 10 to 15 mph NE | 6% |
| Monday | 62°F | Mostly Cloudy | 10 mph NE | 7% |
| Monday Night | 46°F | Mostly Cloudy | 5 to 10 mph NE | 5% |
| Tuesday | 62°F | Partly Sunny | 5 to 10 mph NE | 5% |
| Tuesday Night | 44°F | Partly Cloudy | 5 to 10 mph NE | 3% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph E | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Merrimac, WI
Last spring frost
May 5
First fall frost
Oct 5
Growing season
152 days
Hardiness zone
5a
Explore more for Merrimac, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Baraboo, Wi (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.