Merrimac, WI Weather & Growing Conditions
Today
80°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Southwest wind around 10 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 |
|---|---|---|---|---|
| Today | 80°F | Partly Sunny then Chance Showers And Thunderstorms | 10 mph SW | 33% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 72% |
| Wednesday | 77°F | Areas Of Fog then Partly Sunny | 0 to 5 mph W | 37% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 5 mph W | 5% |
| Thursday | 79°F | Sunny | 0 mph | 5% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 1% |
| Friday | 81°F | Sunny | 0 to 10 mph SW | 2% |
| Friday Night | 63°F | Mostly Clear | 5 mph SW | 7% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 13% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 31% |
| Sunday | 84°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 | 82°F | Chance Rain Showers | 5 mph S | 50% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 39% |
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 Aug 4, 2026.