Merrimac, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merrimac, a village in Sauk County, Wisconsin.
Today
81°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Southwest wind 0 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Merrimac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 10 mph SW | 34% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 73% |
| Wednesday | 77°F | Areas Of Fog then Partly Sunny | 0 to 5 mph W | 38% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 5 mph W | 6% |
| Thursday | 79°F | Sunny | 0 mph | 6% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 1% |
| Friday | 82°F | Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 63°F | Mostly Clear | 5 mph SW | 7% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SW | 13% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 31% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 31% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 50% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 50% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph NE | 40% |
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 Aug 4, 2026.