NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Thunderstorm Light Rain

66°F

19°C

Humidity	88%
Wind Speed	S 7 mph
Barometer	30.00 in
Dewpoint	63°F (17°C)
Visibility	5.00 mi
Last update	18 May 4:50 pm CDT

More Information:

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

Extended Forecast for

Bethalto IL

Flood Watch May 18, 05:02pm until May 19, 01:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch May 18, 05:02pm until May 19, 01:00pm
NOW until 1:00pm Tue
Flood Watch
This Afternoon
High: 75 °F
Heavy Rain
Tonight
Low: 66 °F
T-storms
Likely then
Chance
T-storms
Tuesday
High: 81 °F
Chance
T-storms then
T-storms
Tuesday Night
Low: 55 °F
T-storms
Likely then
Showers
Likely
Wednesday
High: 69 °F
Partly Sunny
Wednesday Night
Low: 49 °F
Mostly Cloudy
Thursday
High: 72 °F
Partly Sunny
Thursday Night
Low: 55 °F
Slight Chance
Showers then
Chance
Showers

Detailed Forecast

This Afternoon

Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 75. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

Tonight

Showers and thunderstorms likely, mainly before 4am. Mostly cloudy, with a low around 66. South wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

Tuesday

Showers and thunderstorms, mainly before 5pm. High near 81. South wind 11 to 16 mph becoming west in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 80%.

Tuesday Night

Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 55. Northwest wind 8 to 10 mph. Chance of precipitation is 70%.

Wednesday

Partly sunny, with a high near 69. North wind 9 to 11 mph.

Wednesday Night

Mostly cloudy, with a low around 49.

Thursday

Partly sunny, with a high near 72.

Thursday Night

A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 55. Chance of precipitation is 50%.

Friday

Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.

Friday Night

A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 59.

Saturday

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.

Saturday Night

A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.

Sunday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.

Sunday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 63.

Memorial Day

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.