Weather for St Charles, Missouri
Current Weather
Five Day Weather Forecast
Mon
H: 79°F
L: 59°F
Tue
H: 60°F
L: 52°F
Wed
H: 55°F
L: 45°F
Thu
H: 63°F
L: 43°F
Fri
H: 69°F
L: 50°F
Air Quality
Nitrogen Dioxide: 9.45 μg/m3
Sulphur Dioxide: 2.65 μg/m3
Ozone: 62 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:57 PM
Daylight: 13 hrs 57 mins
Moon Transit: 2:54 AM
Moonset: 7:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%
Best Times for Fishing or Hunting
Major Periods
2:24 AM - 4:54 AM2:46 PM - 5:16 PM
Minor Periods
12:00 AM - 12:00 AM6:54 AM - 8:24 AM
Action Rating: 2 out of 5
Flood Warning issued May 3 at 10:23AM CDT until May 4 at 11:48PM CDT by NWS St Louis MO
Effective: Sun May 3, 2026, 10:23 AM
Expires: Mon May 4, 2026, 10:30 PM
...The Flood Warning continues for the following rivers in Missouri... Meramec River near Arnold. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Meramec River near Arnold. * WHEN...Until Monday evening. * ADDITIONAL DETAILS... - At 10:00 AM CDT Sunday the stage was 24.7 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Sunday was 26.4 feet. - Forecast...The river is expected to fall below flood stage late this afternoon. - Flood stage is 24.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued May 3 at 10:29AM CDT until May 4 at 9:00PM CDT by NWS St Louis MO
Effective: Sun May 3, 2026, 10:29 AM
Expires: Mon May 4, 2026, 9:00 PM
...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Mel Price LD. Mississippi River at Chester. Mississippi River at Grafton. Mississippi River at Winfield. Mississippi River at Louisiana. ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Mel Price LD. * WHEN...Until Monday evening. * ADDITIONAL DETAILS... - At 10:00 AM CDT Sunday the stage was 21.2 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Sunday was 23.0 feet. - Forecast...The river is expected to fall below flood stage late this afternoon. - Flood stage is 21.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued May 3 at 10:29AM CDT until May 5 at 5:00PM CDT by NWS St Louis MO
Effective: Sun May 3, 2026, 10:29 AM
Expires: Mon May 4, 2026, 10:30 PM
...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Mel Price LD. Mississippi River at Chester. Mississippi River at Grafton. Mississippi River at Winfield. Mississippi River at Louisiana. ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Clarksville. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Grafton. * WHEN...Until Tuesday afternoon. * ADDITIONAL DETAILS... - At 10:00 AM CDT Sunday the stage was 20.9 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Sunday was 22.1 feet. - Forecast...The river is expected to fall below flood stage late tomorrow morning. - Flood stage is 20.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued May 3 at 8:37PM CDT until May 5 at 1:00PM CDT by NWS St Louis MO
Effective: Sun May 3, 2026, 8:37 PM
Expires: Tue May 5, 2026, 8:45 AM
...The Flood Warning continues for the following river in Illinois and Missouri... Mississippi River at Chester. Mississippi River at Grafton. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Grafton. * WHEN...Until Tuesday afternoon. * ADDITIONAL DETAILS... - At 8:30 PM CDT Sunday the stage was 20.3 feet. - Forecast...The river is expected to fall below flood stage Monday morning. - Flood stage is 20.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. Rainfall heavier than forecast could cause river levels to rise even higher than predicted. The National Weather Service will monitor this developing situation and issue follow up statements as conditions change. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued May 3 at 10:13AM CDT by NWS St Louis MO
Effective: Sun May 3, 2026, 10:13 AM
Expires: Mon May 4, 2026, 10:15 PM
...The Flood Warning continues for the following rivers in Illinois... Illinois River at Valley City. Illinois River at Hardin. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Hardin. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 10:00 AM CDT Sunday the stage was 27.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Sunday was 28.3 feet. - Forecast...The river is expected to continue a slow fall, but remain above flood stage. It is expected to fall as low as 25.9 feet by Friday, May 08. - Flood stage is 25.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Weather Forecast
Air Quality
Nitrogen Dioxide: 9.17 μg/m3
Sulphur Dioxide: 2.51 μg/m3
Ozone: 94.28 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:57 PM
Daylight: 13 hrs 57 mins
Moon Transit: 2:54 AM
Moonset: 7:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%
Best Times for Fishing or Hunting
Major Periods
2:24 AM - 4:54 AM2:46 PM - 5:16 PM
Minor Periods
12:00 AM - 12:00 AM6:54 AM - 8:24 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 7.29 μg/m3
Sulphur Dioxide: 2.42 μg/m3
Ozone: 87.96 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:58 PM
Daylight: 13 hrs 59 mins
Moon Transit: 3:45 AM
Moonset: 8:13 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%
Best Times for Fishing or Hunting
Major Periods
3:15 AM - 5:45 AM3:37 PM - 6:07 PM
Minor Periods
7:43 AM - 9:13 AM12:00 AM - 12:00 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 8.37 μg/m3
Sulphur Dioxide: 2.66 μg/m3
Ozone: 63.04 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:59 PM
Daylight: 14 hrs 1 mins
Moon Transit: 4:37 AM
Moonset: 9:07 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.0%
Best Times for Fishing or Hunting
Major Periods
4:07 AM - 6:37 AM4:28 PM - 6:58 PM
Minor Periods
8:37 AM - 10:07 AM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 9.42 μg/m3
Sulphur Dioxide: 2.18 μg/m3
Ozone: 58.92 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:00 PM
Daylight: 14 hrs 3 mins
Moon Transit: 5:27 AM
Moonset: 10:08 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%
Best Times for Fishing or Hunting
Major Periods
4:57 AM - 7:27 AM5:18 PM - 7:48 PM
Minor Periods
9:38 AM - 11:08 AM12:22 AM - 1:52 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:01 PM
Daylight: 14 hrs 5 mins
Moon Transit: 6:16 AM
Moonset: 11:10 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%
Best Times for Fishing or Hunting
Major Periods
5:46 AM - 8:16 AM6:05 PM - 8:35 PM
Minor Periods
10:40 AM - 12:10 AM12:58 AM - 2:28 AM
Action Rating: 3 out of 5