Severe Weather Across the Northern Tier of the Country; Heat Builds Across the Center of the Nation

A frontal boundary will focus the threat for showers and thunderstorms, some severe, across the northern tier of the country through Tuesday. Meanwhile, dangerous heat will expand across the center of the nation through at least the middle of the week. Elevated to critical fire weather conditions will persist across the Great Basin, portions of the Plains and interior Alaska. Read More >

Hazardous Weather Conditions

Excessive Heat Warning in effect from July 4, 02:39 PM CDT until July 6, 11:00 PM CDT

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75° N Lon: 90.37° W Elev: 604 ft.

Mostly Cloudy

93°F

34°C

Humidity	50%
Wind Speed	S 12 mph
Barometer	29.96 in (1012.8 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	101°F (38°C)
Last update	4 Jul 7:51 pm CDT

More Information:

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

Detailed forecast for

St. Louis County

Tonight

Mostly clear. Lows in the mid 70s to lower 80s. Highest heat index readings of around 106 early in the evening. South winds around 10 mph.

Tuesday

Very hot and humid. Mostly sunny. Highs around 100. Highest heat index readings of around 111 in the late morning and afternoon. Southwest winds around 10 mph.

Tuesday Night

Mostly clear. Lows in the mid 70s to lower 80s. Highest heat index readings of around 110 early in the evening. South winds around 10 mph in the evening becoming light after midnight.

Wednesday

Very hot and humid. Mostly sunny. A 20 percent chance of showers and thunderstorms in the afternoon. Highs around 100. Highest heat index readings of around 111 in the late morning and afternoon. Light wind.

Wednesday Night

Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the mid 70s to lower 80s. Highest heat index readings of around 110 early in the evening. Light wind.

Thursday

Hot and humid. Mostly sunny with a 30 percent chance of showers and thunderstorms. Highs around 100. Around 109.

Thursday Night

Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the mid 70s. Highest heat index readings of around 107 in the evening.

Friday And Friday Night

Partly cloudy with a 40 percent chance of showers and thunderstorms. Highs in the mid 90s. Lows in the lower 70s. Around 108.

Saturday

Hot and humid. Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs around 90. Around 100.

Saturday Night Through Sunday Night

Clear. Lows around 70. Highs around 90.

Monday

Hot and humid. Mostly sunny. Highs in the mid 90s. Around 100.