Weather for St Charles, Missouri
Current Weather
Five Day Weather Forecast
Thu
H: 89°F
L: 70°F
Fri
H: 83°F
L: 70°F
Sat
H: 84°F
L: 72°F
Sun
H: 98°F
L: 74°F
Mon
H: 99°F
L: 76°F
Air Quality
Nitrogen Dioxide: 19.7 μg/m3
Sulphur Dioxide: 2.2 μg/m3
Ozone: 22 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 53 mins
Moon Transit: 9:58 PM
Moonset: 2:12 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.2%
Best Times for Fishing or Hunting
Major Periods
9:01 AM - 11:31 AM9:28 PM - 11:58 PM
Minor Periods
4:37 PM - 6:07 PM1:42 AM - 3:12 AM
Action Rating: 2 out of 5
Flood Warning issued June 24 at 9:11PM CDT by NWS St Louis MO
Effective: Wed June 24, 2026, 9:11 PM
Expires: Fri June 26, 2026, 9:15 AM
...The Flood Warning continues for the Illinois river at the following locations... Illinois River at Meredosia. Illinois River at La Grange LD. 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. * IMPACTS...At 25.0 feet, Flood Stage. Lowland flooding of unprotected agricultural land begins. * ADDITIONAL DETAILS... - At 8:30 PM CDT Wednesday the stage was 26.9 feet. - Forecast...The river is expected to rise to a crest of 26.9 feet tomorrow morning. - 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 Watch issued June 25 at 1:16AM CDT until June 26 at 7:00AM CDT by NWS St Louis MO
Effective: Thu June 25, 2026, 1:16 AM
Expires: Thu June 25, 2026, 4:30 PM
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Illinois, including the following areas, Bond IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL, Marion IL, Monroe IL, Montgomery IL, Saint Clair IL and Washington IL and Missouri, including the following areas, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Jefferson MO, Lincoln MO, Moniteau MO, Montgomery MO, Osage MO, Saint Charles MO, Saint Louis City MO, Saint Louis MO, Warren MO and Washington MO. * WHEN...From 1 PM CDT this afternoon through Friday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Multiple waves of thunderstorms capable of heavy rainfall. - Some locations that may experience flooding include... St. Louis, Columbia, O'Fallon, St. Charles, St. Peters, Florissant, Chesterfield, Belleville, Jefferson City, Wildwood, University City, Ballwin, Granite City, Wentzville, Alton, Kirkwood, Maryland Heights, East St. Louis and Hazelwood.
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Weather Forecast
Air Quality
Nitrogen Dioxide: 14.61 μg/m3
Sulphur Dioxide: 2.82 μg/m3
Ozone: 65.21 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 53 mins
Moon Transit: 9:58 PM
Moonset: 2:12 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.2%
Best Times for Fishing or Hunting
Major Periods
9:01 AM - 11:31 AM9:28 PM - 11:58 PM
Minor Periods
4:37 PM - 6:07 PM1:42 AM - 3:12 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 15.59 μg/m3
Sulphur Dioxide: 2.77 μg/m3
Ozone: 53.46 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 53 mins
Moon Transit: 10:46 PM
Moonset: 2:44 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.2%
Best Times for Fishing or Hunting
Major Periods
9:48 AM - 12:18 AM12:00 AM - 12:00 AM
Minor Periods
5:39 PM - 7:09 PM2:14 AM - 3:44 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 11.48 μg/m3
Sulphur Dioxide: 2.68 μg/m3
Ozone: 58.08 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:31 PM
Daylight: 14 hrs 53 mins
Moon Transit: 11:37 PM
Moonset: 3:21 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.2%
Best Times for Fishing or Hunting
Major Periods
10:37 AM - 1:07 PM12:00 AM - 12:00 AM
Minor Periods
6:37 PM - 8:07 PM2:51 AM - 4:21 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 6.33 μg/m3
Sulphur Dioxide: 2.8 μg/m3
Ozone: 70.95 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:31 PM
Daylight: 14 hrs 52 mins
Moon Transit: 12:00 AM
Moonset: 4:05 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.8%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM11:28 AM - 1:58 PM
Minor Periods
7:31 PM - 9:01 PM3:35 AM - 5:05 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: 1:05 PM
Sunset: 8:31 PM
Daylight: 14 hrs 52 mins
Moon Transit: 12:28 AM
Moonset: 4:57 AM
Moon Phase: Full
Moon Illumination: 100.0%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM12:20 AM - 2:50 PM
Minor Periods
8:19 PM - 9:49 PM4:27 AM - 5:57 AM
Action Rating: 5 out of 5