National Weather Service United States Department of Commerce

A stalled frontal boundary and ample monsoonal moisture will lead to flash flood potential from the Great Basin to the Great Plains tonight and Tuesday

A stalled frontal boundary will set up along the southern and central Rockies for the next couple of days providing focus for showers and thunderstorms. In addition, ample monsoonal moisture will stream in across the southwest bringing enough moisture to introduce a flash flood threat from the Great Basin and Southwest eastward across the central and southern Rockies into the adjacent Plains.
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Hazardous Weather Conditions

Current Conditions

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Lemont IL

7 Day Forecast

For More Weather Information:

Chicago, IL Local Forecast Office

Overnight

Partly Cloudy

Partly
Cloudy

Low: 55 °F

Tuesday

Scattered Thunderstorms Chance for Measurable Precipitation 30%

Scattered
Thunderstorms

High: 78 °F

Tuesday
Night

Scattered Thunderstorms Chance for Measurable Precipitation 30%

Scattered
Thunderstorms

Low: 59 °F

Wednesday

Chance Showers Chance for Measurable Precipitation 30%

Chance
Showers

High: 78 °F

Wednesday
Night

Slight Chance Showers Chance for Measurable Precipitation 20%

Slight Chc
Showers

Low: 57 °F

Thursday

Mostly Sunny

Mostly
Sunny

High: 80 °F

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: 62 °F

Friday

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

High: 80 °F

Friday
Night

Slight Chance Showers

Slight Chc
Showers

Low: 61 °F

Detailed Forecast

  • Overnight Partly cloudy, with a low around 55. West northwest wind around 5 mph.
  • Tuesday Scattered showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 78. West northwest wind 5 to 10 mph. Chance of precipitation is 30%.
  • Tuesday Night Scattered showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 2am. Partly cloudy, with a low around 59. North northwest wind around 5 mph becoming west after midnight. Chance of precipitation is 30%.
  • Wednesday A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. West northwest wind 5 to 10 mph. Chance of precipitation is 30%.
  • Wednesday Night A slight chance of showers before 10pm. Partly cloudy, with a low around 57. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
  • Thursday Mostly sunny, with a high near 80.
  • Thursday Night Partly cloudy, with a low around 62.
  • Friday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
  • Friday Night A slight chance of showers. Partly cloudy, with a low around 61.
  • Saturday A chance of showers and thunderstorms. Mostly sunny, with a high near 80.
  • Saturday Night Partly cloudy, with a low around 60.
  • Sunday Mostly sunny, with a high near 81.
  • Sunday Night Mostly clear, with a low around 62.
  • Monday Mostly sunny, with a high near 82.