National Weather Service United States Department of Commerce

Heavy rain possible for the northern Rockies & Plains; severe storms for the Northern Plains

An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, with locally heavy rainfall, to the northern Rockies and northern Plains. Isolated flash floods will be possible in these areas. Some storms could become severe in parts of the Dakotas into Minnesota, with large hail and damaging winds. In addition, temperatures will be 10 to 20 degrees below average.
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Current Conditions

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Herculaneum MO

7 Day Forecast

For More Weather Information:

Saint Louis, MO Local Forecast Office

This
Afternoon

Sunny

Sunny

High: 96 °F

Tonight

Mostly Clear

Mostly
Clear

Low: 73 °F

Sunday

Hot

Hot

High: 98 °F

Sunday
Night

Mostly Clear

Mostly
Clear

Low: 74 °F

Monday

Sunny

Sunny

High: 96 °F

Monday
Night

Mostly Clear

Mostly
Clear

Low: 74 °F

Tuesday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 94 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 73 °F

Wednesday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 90 °F

Detailed Forecast

  • This Afternoon Sunny, with a high near 96. Heat index values as high as 105. South wind around 5 mph.
  • Tonight Mostly clear, with a low around 73. Southeast wind around 5 mph becoming calm after midnight.
  • Sunday Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming south around 5 mph in the afternoon.
  • Sunday Night Mostly clear, with a low around 74. Southeast wind 3 to 5 mph.
  • Monday Sunny, with a high near 96. South wind 5 to 7 mph.
  • Monday Night Mostly clear, with a low around 74.
  • Tuesday A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
  • Tuesday Night Partly cloudy, with a low around 73.
  • Wednesday A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
  • Wednesday Night A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
  • Thursday A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
  • Thursday Night A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
  • Friday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.