Weather for St Charles, Missouri
Current Weather
Five Day Weather Forecast
Sun
H: 80°F
L: 43°F
Mon
H: 76°F
L: 59°F
Tue
H: 62°F
L: 48°F
Wed
H: 52°F
L: 46°F
Thu
H: 66°F
L: 45°F
Air Quality
Nitrogen Dioxide: 5.65 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 114 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:56 PM
Daylight: 13 hrs 54 mins
Moon Transit: 2:04 AM
Moonset: 6:43 AM
Moon Phase: Full
Moon Illumination: 94.4%
Best Times for Fishing or Hunting
Major Periods
1:34 AM - 4:04 AM1:55 PM - 4:25 PM
Minor Periods
9:53 PM - 11:23 PM6:13 AM - 7:43 AM
Action Rating: 4 out of 5
Flood Warning issued May 2 at 7:44PM CDT until May 4 at 11:48PM CDT by NWS St Louis MO
Effective: Sat May 2, 2026, 7:44 PM
Expires: Mon May 4, 2026, 7:45 AM
...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. * IMPACTS...At 26.0 feet, Athletic fields east of I-55 begin flooding near this height. * ADDITIONAL DETAILS... - At 7:00 PM CDT Saturday the stage was 25.8 feet and falling. - Recent Activity...The river rose above flood stage on April 29, cresting near 27.3 feet on May 1. - Forecast...The river is expected to fall below flood stage tomorrow afternoon and continue falling in the following days. - 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 2 at 8:19PM CDT until May 5 at 11:30PM CDT by NWS St Louis MO
Effective: Sat May 2, 2026, 8:19 PM
Expires: Mon May 4, 2026, 8:30 AM
...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 Louisiana. ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Winfield. 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 evening. * IMPACTS...At 21.5 feet, In Portage des Sioux, MO, Le Sieur Street leading to the Marina and to Our Lady of the River Statue is flooded. * ADDITIONAL DETAILS... - At 8:00 PM CDT Saturday the stage was 21.7 feet and falling. - Recent Activity...The river rose above flood stage on April 19, cresting near 22.9 feet on May 1. - Forecast...The river is expected to fall below flood stage Monday afternoon and continue falling over the following days. - 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 2 at 8:19PM CDT until May 5 at 3:00AM CDT by NWS St Louis MO
Effective: Sat May 2, 2026, 8:19 PM
Expires: Mon May 4, 2026, 8:30 AM
...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 Louisiana. ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Winfield. 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 late Monday night. * IMPACTS...At 23.0 feet, Dresser Island Drive floods within a foot of this level. * ADDITIONAL DETAILS... - At 8:00 PM CDT Saturday the stage was 22.3 feet and falling. - Recent Activity...The river rose above flood stage on April 28, cresting near 24.3 feet on MAy 1. - Forecast...The river is expected to fall below flood stage late tomorrow evening and continue falling over the following days. - 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 2 at 8:24PM CDT by NWS St Louis MO
Effective: Sat May 2, 2026, 8:24 PM
Expires: Mon May 4, 2026, 8:30 AM
...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 8:00 PM CDT Saturday the stage was 28.0 feet and falling. - Recent Activity...The river rose above flood stage on April 18, cresting near 28.8 feet on May 1. - Forecast...The river is expected to continue a slow fall, but remain above flood stage. It is expected to fall as low as 25.8 feet by Saturday, May 09. - 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
Flood Warning issued May 2 at 8:19PM CDT until May 5 at 5:00AM CDT by NWS St Louis MO
Effective: Sat May 2, 2026, 8:19 PM
Expires: Mon May 4, 2026, 8:30 AM
...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 Louisiana. ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Winfield. 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 Winfield. * WHEN...Until late Monday night. * IMPACTS...At 27.5 feet, At this stage, Lock and Dam 25 will stockpile 200 tons of sand, 12,000 sandbags, and 10,000 square feet of polyethylene plastic as a precaution. * ADDITIONAL DETAILS... - At 8:00 PM CDT Saturday the stage was 27.3 feet and falling. - Recent Activity...The river rose above flood stage on April 15, cresting near 29.6 feet on April 29. - Forecast...The river is expected to fall below flood stage late tomorrow evening and continue falling over the following days. - Flood stage is 26.0 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: 13.64 μg/m3
Sulphur Dioxide: 2.62 μg/m3
Ozone: 83.24 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 7:56 PM
Daylight: 13 hrs 54 mins
Moon Transit: 2:04 AM
Moonset: 6:43 AM
Moon Phase: Full
Moon Illumination: 94.4%
Best Times for Fishing or Hunting
Major Periods
1:34 AM - 4:04 AM1:55 PM - 4:25 PM
Minor Periods
9:53 PM - 11:23 PM6:13 AM - 7:43 AM
Action Rating: 4 out of 5
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