Weather Alert
Marengo Weather Warning NWS WEATHER ALERT FOR THE MARENGO, IL AREA - Issued: 1200 PM CDT Tue Sep 8 2026 Marengo Weather Warning

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Marengo, IL Weather Forecast

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Marengo, IL Weather Forecast

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Marengo IL weather - Lightning Observed - 79°F
Lightning Observed
79°F
Updated 12:25 pm
Feels Like 81°F
Humidity 57%
Wind S 5 mph
Barometer  30.17 in
Dew Point 63°F
Marengo IL weather - Lightning Observed - 26°C
Lightning Observed
26°C
Updated 12:25 pm
Feels Like 27°C
Humidity 57%
Wind S 8 km/h
Barometer  102.2 kPa
Dew Point 17°C
WX Settings

Marengo Weather Forecast

TODAY TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT
Marengo, IL Weather - Today Mostly Cloudy Marengo, IL Weather - Tonight Chance Of T-Storm Marengo, IL Weather - Wednesday Chance Of T-Storm Marengo, IL Weather - Wednesday Night Partly Cloudy Marengo, IL Weather - Thursday Clearing Marengo, IL Weather - Thursday Night Clear Marengo, IL Weather - Friday Mostly Sunny Marengo, IL Weather - Friday Night Chance Of Showers Marengo, IL Weather - Saturday Chance Of Showers Marengo, IL Weather - Saturday Night Chance Of Showers Marengo, IL Weather - Sunday Chance Of Showers Marengo, IL Weather - Sunday Night Chance Of Showers
Mostly Cloudy Chance of T-Storm Chance of T-Storm Partly Cloudy Clearing Clear Mostly Sunny Chance of Showers Chance of Showers Chance of Showers Chance of Showers Chance of Showers
Hi: 85°FHi: 29°C
 Lo: 70°FLo: 21°C Hi: 81°FHi: 27°C
 Lo: 60°FLo: 16°C Hi: 79°FHi: 26°C
 Lo: 55°FLo: 13°C Hi: 80°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
 Lo: 60°FLo: 16°C Hi: 79°FHi: 26°C
 Lo: 61°FLo: 16°C
POP: 70% POP: 80% POP: 20% POP: 30% POP: 30% POP: 40% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 856 AM CDT Tue Sep 08 2026 Marengo, IL Weather - WeatherWorld.com

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Issued: 633 AM CDT Tue Sep 8 2026

Key Messages

  • Showers and some thunderstorms are expected later tonight into Wednesday.
  • Temperatures will remain near to above average through the upcoming weekend, warmest today and then again over the weekend.

Discussion

... Issued at 220 AM CDT Tue Sep 8 2026

The upper ridge that has been responsible for our near record warm first week of September is poised to be suppressed southward a bit mid week as a pair of shortwave troughs pass by to our north. These two shortwaves show up nicely on water v...