Marengo Weather Forecast
- 44
- 68
Chance Thunderstorms
- 51
- 67
Slight Chance Rain Showers
- 43
- 64
Partly Sunny
- 43
- 66
Mostly Sunny
- 44
- 67
Mostly Sunny
- 49
- 71
Partly Sunny
- 53
- 75
Partly Sunny
Today 3 Sep McHenry
Showers likely late morning through mid afternoon. A chance of Thunderstorms. A chance of Showers late in the afternoon. Highs around 70. Temperature falling into the lower 60s in the afternoon. West Winds 10 to 20 Mph. Chance of precipitation 70 percent.
Tonight 3 Sep McHenry
Mostly cloudy through the early Overnight, then becoming mostly clear. Lows in the mid 40s. Northwest Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight.
Marengo Temperature Statistics
September Temperature
De Kalb Taylor Municipal Airport (22.4 miles)
Lowest 1 September, 2025
53.1 °FAverage September
64.6 °FHighest 1 September, 2025
76.8 °F
Climate (2020–Present)
De Kalb Taylor Municipal Airport (22.4 miles)
Average Low 2020–2025
40.3 °FAverage 2020–2025
49.4 °FAverage High 2020–2025
58.5 °F