Merrimac, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merrimac, a village in Sauk County, Wisconsin.
This Afternoon
70°F
Light Rain Likely
Rain likely. Cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Merrimac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Light Rain Likely | 15 mph S | 66% |
| Tonight | 55°F | Light Rain | 10 to 15 mph S | 93% |
| Wednesday | 60°F | Light Rain Likely | 10 to 15 mph SW | 73% |
| Wednesday Night | 45°F | Light Rain | 10 to 15 mph SW | 77% |
| Thursday | 53°F | Light Rain | 5 to 10 mph W | 84% |
| Thursday Night | 38°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 26% |
| Friday | 49°F | Slight Chance Light Rain then Partly Sunny | 5 to 10 mph N | 16% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Sunday | 58°F | Slight Chance Light Rain | 5 to 10 mph W | 16% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 4% |
| Monday | 61°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 3, 2026.