Weather Alert
Flagg Weather Warning NWS WEATHER ALERT FOR THE FLAGG, IL AREA - Issued: 903 PM CDT Fri Sep 4 2026 Flagg Weather Warning

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Flagg, IL Weather Forecast

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Flagg, IL Weather Forecast

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Flagg IL weather - Clear - 73°F
Clear
73°F
Updated 1:38 am
Feels Like 83°F
Humidity 94%
Wind N 0 mph
Barometer  29.94 in
Dew Point 71°F
Flagg IL weather - Clear - 23°C
Clear
23°C
Updated 1:38 am
Feels Like 28°C
Humidity 94%
Wind N 0 km/h
Barometer  101.4 kPa
Dew Point 22°C
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Flagg Weather Forecast

OVERNIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT LABOR DAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY
Flagg, IL Weather - Overnight Chance Of T-Storm Flagg, IL Weather - Saturday Patchy Fog Flagg, IL Weather - Saturday Night Partly Cloudy Flagg, IL Weather - Sunday Partly Cloudy Flagg, IL Weather - Sunday Night Mostly Clear Flagg, IL Weather - Labor Day Partly Cloudy Flagg, IL Weather - Monday Night Partly Cloudy Flagg, IL Weather - Tuesday Partly Cloudy Flagg, IL Weather - Tuesday Night Chance Of Showers Flagg, IL Weather - Wednesday Partly Cloudy Flagg, IL Weather - Wednesday Night Chance Of Showers Flagg, IL Weather - Thursday Partly Cloudy
Chance of T-Storm Patchy Fog Partly Cloudy Partly Cloudy Mostly Clear Partly Cloudy Partly Cloudy Partly Cloudy Chance of Showers Partly Cloudy Chance of Showers Partly Cloudy
Lo: 71°FLo: 22°C Hi: 85°FHi: 29°C
 Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
 Lo: 59°FLo: 15°C Hi: 81°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 89°FHi: 32°C
 Lo: 71°FLo: 22°C Hi: 89°FHi: 32°C
 Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
POP: 20% POP: 50% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 1141 PM CDT Fri Sep 04 2026 Flagg, IL Weather - WeatherWorld.com

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Issued: 1228 AM CDT Sat Sep 5 2026

Key Messages

  • Chance of scattered showers and thunderstorms tonight.
  • Gradually turning cooler and less humid this weekend, though remaining seasonably warm.
  • Moderate to high swim risk expected late Saturday into early Sunday during the final weekend of beach season.

Discussion

... Issued at 314 PM CDT Fri Sep 4 2026

Breezy east-northeasterly winds this morning in the wake of the outflow boundary have significantly impacted the ability to heat up through early afternoon. This has particularly been tru...