Marengo, WI Weather & Growing Conditions
Today
59°F
Light Rain
Rain and patchy fog. Cloudy. High near 59, with temperatures falling to around 54 in the afternoon. Northeast wind 0 to 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Light Rain | 0 to 5 mph NE | 83% |
| Tonight | 40°F | Light Rain | 5 to 15 mph N | 88% |
| Thursday | 44°F | Light Rain | 10 to 15 mph N | 79% |
| Thursday Night | 28°F | Slight Chance Rain And Snow then Cloudy | 5 to 10 mph N | 21% |
| Friday | 42°F | Partly Sunny | 0 to 5 mph NE | 2% |
| Friday Night | 23°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 46°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 30°F | Partly Cloudy | 5 to 10 mph SW | 9% |
| Sunday | 50°F | Mostly Sunny | 5 to 10 mph W | 12% |
| Sunday Night | 31°F | Partly Cloudy | 5 mph SW | 3% |
| Monday | 55°F | Partly Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 34°F | Partly Cloudy | 5 to 10 mph W | 3% |
| Tuesday | 52°F | Slight Chance Light Rain then Mostly Sunny | 5 mph W | 15% |
| Tuesday Night | 31°F | Mostly Cloudy | 0 mph | 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 Nov 4, 2026.