Marengo, WI Weather & Growing Conditions
Today
77°F
Mostly Sunny
Mostly sunny. High near 77, with temperatures falling to around 75 in the afternoon. Northwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Mostly Sunny | 10 mph NW | 0% |
| Tonight | 53°F | Partly Cloudy | 0 to 5 mph W | 1% |
| Wednesday | 79°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Thursday | 85°F | Sunny | 10 to 15 mph SW | 1% |
| Thursday Night | 66°F | Mostly Clear | 10 to 15 mph SW | 3% |
| Friday | 87°F | Sunny then Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 18% |
| Friday Night | 62°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
| Saturday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 20% |
| Saturday Night | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph SW | 48% |
| Sunday | 79°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 40% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 26% |
| Monday | 79°F | Slight Chance Rain Showers | 0 to 5 mph NW | 21% |
| Monday Night | 58°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 19% |
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 Aug 4, 2026.