Marengo, WI Weather & Growing Conditions
Today
61°F
Patchy Fog
Patchy fog and a slight chance of rain showers. Cloudy. High near 61, with temperatures falling to around 59 in the afternoon. Northeast wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Patchy Fog | 5 mph NE | 16% |
| Tonight | 49°F | Patchy Fog | 0 to 5 mph N | 7% |
| Sunday | 61°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Sunday Night | 40°F | Mostly Cloudy | 0 to 10 mph NE | 1% |
| Monday | 61°F | Partly Sunny | 0 to 10 mph NE | 1% |
| Monday Night | 37°F | Mostly Clear | 0 to 10 mph E | 0% |
| Tuesday | 68°F | Sunny | 0 to 10 mph E | 0% |
| Tuesday Night | 38°F | Mostly Clear | 0 to 5 mph E | 0% |
| Wednesday | 71°F | Sunny | 0 to 5 mph E | 0% |
| Wednesday Night | 42°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Thursday | 72°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 5 mph SE | 3% |
| Friday | 74°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Friday Night | 48°F | Partly Cloudy | 0 to 5 mph SE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Marengo, WI
Last spring frost
May 26
First fall frost
Sep 27
Growing season
125 days
Hardiness zone
4b
Explore more for Marengo, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Mellen 4 Ne, Wi (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.