Weather for St Charles, Missouri
Current Weather
Five Day Weather Forecast
Thu
H: 71°F
L: 52°F
Fri
H: 63°F
L: 58°F
Sat
H: 83°F
L: 58°F
Sun
H: 79°F
L: 63°F
Mon
H: 73°F
L: 65°F
Air Quality
Nitrogen Dioxide: 15.15 μg/m3
Sulphur Dioxide: 2.95 μg/m3
Ozone: 51 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 28 mins
Moon Transit: 6:03 PM
Moonset: 12:42 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%
Best Times for Fishing or Hunting
Major Periods
5:01 AM - 7:31 AM5:33 PM - 8:03 PM
Minor Periods
10:08 AM - 11:38 AM12:12 AM - 1:42 AM
Action Rating: 3 out of 5
Flood Warning issued May 20 at 7:32PM CDT until May 22 at 6:22PM CDT by NWS St Louis MO
Effective: Wed May 20, 2026, 7:32 PM
Expires: Fri May 22, 2026, 7:45 AM
...The Flood Warning is extended for the following rivers in Missouri... Bourbeuse River at Union. ...The Flood Warning continues for the following rivers in Missouri... Moreau River near Jefferson City. 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...Bourbeuse River at Union. * WHEN...Until Friday evening. * ADDITIONAL DETAILS... - At 7:00 PM CDT Wednesday the stage was 16.7 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 7:00 PM CDT Wednesday was 16.7 feet. - Forecast...The river is expected to rise to a crest of 17.1 feet just after midnight tonight. It will then fall below flood stage early tomorrow afternoon. - Flood stage is 15.0 feet.
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued May 21 at 12:01PM CDT until May 23 at 2:32AM CDT by NWS St Louis MO
Effective: Thu May 21, 2026, 12:01 PM
Expires: Sat May 23, 2026, 12:15 AM
...The Flood Warning is extended for the following rivers in Missouri...Illinois... Missouri River at Hermann. Missouri River near Chamois. Bourbeuse River at Union. Kaskaskia River at Carlyle. 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...Bourbeuse River at Union. * WHEN...Until late Friday night. * ADDITIONAL DETAILS... - At 11:30 AM CDT Thursday the stage was 17.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 11:30 AM CDT Thursday was 17.7 feet. - Forecast...The river is expected to fall below flood stage this evening and continue falling to 3.7 feet Thursday, May 28. - Flood stage is 15.0 feet.
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. 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: 10.5 μg/m3
Sulphur Dioxide: 3.22 μg/m3
Ozone: 58.04 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 28 mins
Moon Transit: 6:03 PM
Moonset: 12:42 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%
Best Times for Fishing or Hunting
Major Periods
5:01 AM - 7:31 AM5:33 PM - 8:03 PM
Minor Periods
10:08 AM - 11:38 AM12:12 AM - 1:42 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 12.25 μg/m3
Sulphur Dioxide: 3.13 μg/m3
Ozone: 51.92 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:14 PM
Daylight: 14 hrs 30 mins
Moon Transit: 6:53 PM
Moonset: 1:16 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%
Best Times for Fishing or Hunting
Major Periods
5:55 AM - 8:25 AM6:23 PM - 8:53 PM
Minor Periods
11:20 AM - 12:50 AM12:46 AM - 2:16 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 13.59 μg/m3
Sulphur Dioxide: 2.66 μg/m3
Ozone: 44.76 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:15 PM
Daylight: 14 hrs 31 mins
Moon Transit: 7:39 PM
Moonset: 1:45 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%
Best Times for Fishing or Hunting
Major Periods
6:43 AM - 9:13 AM7:09 PM - 9:39 PM
Minor Periods
12:29 AM - 1:59 PM1:15 AM - 2:45 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 19.89 μg/m3
Sulphur Dioxide: 4.58 μg/m3
Ozone: 66 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:15 PM
Daylight: 14 hrs 33 mins
Moon Transit: 8:23 PM
Moonset: 2:10 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%
Best Times for Fishing or Hunting
Major Periods
7:27 AM - 9:57 AM7:53 PM - 10:23 PM
Minor Periods
1:34 PM - 3:04 PM1:40 AM - 3:10 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 40.4 μg/m3
Sulphur Dioxide: 3.77 μg/m3
Ozone: 24.31 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:16 PM
Daylight: 14 hrs 34 mins
Moon Transit: 9:05 PM
Moonset: 2:33 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%
Best Times for Fishing or Hunting
Major Periods
8:10 AM - 10:40 AM8:35 PM - 11:05 PM
Minor Periods
2:36 PM - 4:06 PM2:03 AM - 3:33 AM
Action Rating: 3 out of 5