Merrimac, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merrimac, a village in Sauk County, Wisconsin.
Overnight
56°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 56. East wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Merrimac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Showers And Thunderstorms | 10 mph E | 100% |
| Saturday | 69°F | Showers And Thunderstorms | 5 to 10 mph SE | 100% |
| Saturday Night | 55°F | Showers And Thunderstorms | 5 to 10 mph NE | 82% |
| Sunday | 66°F | Scattered Rain Showers then Partly Sunny | 10 to 15 mph NE | 27% |
| Sunday Night | 49°F | Mostly Cloudy | 10 to 15 mph NE | 3% |
| Monday | 63°F | Mostly Cloudy | 10 mph NE | 8% |
| Monday Night | 45°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 | 48°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Merrimac (43.376, -89.627). Updated through the day.
Growing snapshot for Merrimac
Last spring frost
May 5
First fall frost
Oct 5
Growing season
152 days
Hardiness zone
5a
More local growing data for Merrimac: nearby ZIP 53561 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Baraboo
Bluffview
Ironton
La Valle
Lake Delton
Lime Ridge
Loganville
North Freedom
Plain
Prairie du Sac
Reedsburg
Rock Springs
Sauk City
Spring Green
West Baraboo
Climate data from the nearest NOAA station, Baraboo, Wi (5.5 mi from Merrimac). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.