Merrimac, WI Weather & Growing Conditions
This Afternoon
69°F
Light Rain Likely
Rain likely. Cloudy, with a high near 69. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Light Rain Likely | 15 mph S | 64% |
| Tonight | 55°F | Light Rain | 10 to 15 mph S | 93% |
| Wednesday | 59°F | Light Rain | 10 to 15 mph SW | 75% |
| Wednesday Night | 46°F | Light Rain | 10 to 15 mph SW | 77% |
| Thursday | 53°F | Light Rain | 5 to 10 mph W | 84% |
| Thursday Night | 39°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 25% |
| Friday | 49°F | Slight Chance Light Rain then Partly Sunny | 5 to 10 mph N | 16% |
| Friday Night | 32°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 | 36°F | Mostly Clear | 5 mph W | 4% |
| Monday | 61°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 3, 2026.