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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Current Conditions

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Arnold MO

7 Day Forecast

For More Weather Information:

Saint Louis, MO Local Forecast Office

Tonight

Mostly Clear

Mostly
Clear

Low: 58 °F

Tuesday

Slight Chance Showers Chance for Measurable Precipitation 20%

Slight Chc
Showers

High: 81 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 60 °F

Wednesday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 83 °F

Wednesday
Night

Partly Cloudy

Partly
Cloudy

Low: 61 °F

Thursday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 82 °F

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: 62 °F

Friday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 83 °F

Friday
Night

Partly Cloudy

Partly
Cloudy

Low: 63 °F

Detailed Forecast

  • Tonight Mostly clear, with a low around 58. North wind around 6 mph becoming calm after midnight.
  • Tuesday A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 81. Calm wind becoming northwest 5 to 7 mph in the morning.
  • Tuesday Night Partly cloudy, with a low around 60. Northwest wind around 5 mph becoming calm in the evening.
  • Wednesday A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the afternoon.
  • Wednesday Night Partly cloudy, with a low around 61. Light and variable wind.
  • Thursday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
  • Thursday Night Partly cloudy, with a low around 62.
  • Friday A slight chance of thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
  • Friday Night Partly cloudy, with a low around 63.
  • Saturday A slight chance of thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
  • Saturday Night Partly cloudy, with a low around 63.
  • Sunday Mostly sunny, with a high near 85.
  • Sunday Night Mostly clear, with a low around 63.
  • Monday Mostly sunny, with a high near 86.