Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair with Haze

83°F

28°C

Humidity	65%
Wind Speed	W 6 mph
Barometer	30.04 in (1016.4 mb)
Dewpoint	70°F (21°C)
Visibility	6.00 mi
Heat Index	87°F (31°C)
Last update	4 Aug 10:54 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

O'Fallon MO

Today
High: 89 °F
Sunny
Tonight
Low: 69 °F
Mostly Clear
Wednesday
High: 90 °F
Mostly Sunny
then Isolated
T-storms
Wednesday Night
Low: 71 °F
Chance
T-storms then
Showers
Likely
Thursday
High: 86 °F
Showers
Likely
Thursday Night
Low: 70 °F
Mostly Cloudy
then Slight
Chance
T-storms
Friday
High: 87 °F
Partly Sunny
Friday Night
Low: 70 °F
Chance
T-storms
Saturday
High: 90 °F
Mostly Sunny

Detailed Forecast

Today

Sunny, with a high near 89. Southeast wind 3 to 5 mph.

Tonight

Mostly clear, with a low around 69. Southeast wind 3 to 5 mph.

Wednesday

Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 90. Light south wind. Chance of precipitation is 20%.

Wednesday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Calm wind becoming south around 5 mph in the evening. Chance of precipitation is 70%.

Thursday

Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 86. South wind around 5 mph becoming light and variable in the morning. Chance of precipitation is 70%.

Thursday Night

A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70.

Friday

Partly sunny, with a high near 87.

Friday Night

A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70.

Saturday

Mostly sunny, with a high near 90.

Saturday Night

Mostly clear, with a low around 73.

Sunday

Sunny, with a high near 92.