Weather for St Charles, Missouri
Current Weather
Five Day Weather Forecast
Sun
H: 90°F
L: 68°F
Mon
H: 72°F
L: 62°F
Tue
H: 80°F
L: 62°F
Wed
H: 80°F
L: 68°F
Thu
H: 81°F
L: 68°F
Air Quality
Nitrogen Dioxide: 12.8 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 52 μg/m3
Astronomical
Sun Transit: 1:03 PM
Sunset: 8:31 PM
Daylight: 14 hrs 54 mins
Moon Transit: 7:03 PM
Moonset: 12:36 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%
Best Times for Fishing or Hunting
Major Periods
6:07 AM - 8:37 AM6:33 PM - 9:03 PM
Minor Periods
12:28 AM - 1:58 PM12:06 AM - 1:36 AM
Action Rating: 2 out of 5
Flood Warning issued June 20 at 10:53AM CDT by NWS St Louis MO
Effective: Sat June 20, 2026, 10:53 AM
Expires: Sun June 21, 2026, 11:00 PM
...The Flood Warning continues for the following locations on the Illinois river... Illinois River at La Grange LD. Illinois River at Valley City. Illinois River at Hardin. Illinois River at Meredosia. 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 10:30 AM CDT Saturday the stage was 25.3 feet. - Forecast...The river is expected to rise to a crest of 25.8 feet early Wednesday 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 Warning issued June 20 at 6:37PM CDT by NWS St Louis MO
Effective: Sat June 20, 2026, 6:37 PM
Expires: Mon June 22, 2026, 6:45 AM
...The Flood Warning continues for the following rivers in Illinois... 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 6:00 PM CDT Saturday the stage was 25.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 6:00 PM CDT Saturday was 25.3 feet. - Forecast...The river is expected to rise to 25.9 feet Wednesday morning. Additional rises are possible thereafter. - 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 20 at 2:49PM CDT until June 22 at 1:00AM CDT by NWS St Louis MO
Effective: Sat June 20, 2026, 2:49 PM
Expires: Sun June 21, 2026, 6:00 AM
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Illinois, including the following areas, Bond IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL and Montgomery IL and east central Missouri, including the following areas, Franklin MO, Saint Charles MO, Saint Louis City MO and Saint Louis MO. * WHEN...From Sunday morning through late Sunday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Thunderstorms producing heavy rainfall moving over the same locations could produce flash flooding. Rainfall amounts of 1-3 inches are expected with locally higher amounts possible.
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Flood Watch issued June 21 at 3:09AM CDT until June 22 at 1:00AM CDT by NWS St Louis MO
Effective: Sun June 21, 2026, 3:09 AM
Expires: Sun June 21, 2026, 6:15 PM
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Illinois, including the following areas, Bond IL, Fayette IL, Greene IL, Jersey IL, Macoupin IL, Madison IL and Montgomery IL and east central Missouri, including the following areas, Franklin MO, Saint Charles MO, Saint Louis City MO and Saint Louis MO. * WHEN...From 7 AM CDT this morning through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Thunderstorms producing heavy rainfall moving over the same locations could produce flash flooding. Rainfall amounts of 1-3 inches are expected with locally higher amounts up to 6 inches possible.
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Weather Forecast
Air Quality
Nitrogen Dioxide: 9.15 μg/m3
Sulphur Dioxide: 1.89 μg/m3
Ozone: 73.92 μg/m3
Astronomical
Sun Transit: 1:03 PM
Sunset: 8:31 PM
Daylight: 14 hrs 54 mins
Moon Transit: 7:03 PM
Moonset: 12:36 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%
Best Times for Fishing or Hunting
Major Periods
6:07 AM - 8:37 AM6:33 PM - 9:03 PM
Minor Periods
12:28 AM - 1:58 PM12:06 AM - 1:36 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 6.26 μg/m3
Sulphur Dioxide: 1.16 μg/m3
Ozone: 61 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 54 mins
Moon Transit: 7:45 PM
Moonset: 12:58 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%
Best Times for Fishing or Hunting
Major Periods
6:50 AM - 9:20 AM7:15 PM - 9:45 PM
Minor Periods
1:31 PM - 3:01 PM12:28 AM - 1:58 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 10.2 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 66.25 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 54 mins
Moon Transit: 8:28 PM
Moonset: 1:21 AM
Moon Phase: First Quarter
Moon Illumination: 61.0%
Best Times for Fishing or Hunting
Major Periods
7:32 AM - 10:02 AM7:58 PM - 10:28 PM
Minor Periods
2:33 PM - 4:03 PM12:51 AM - 2:21 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 16.32 μg/m3
Sulphur Dioxide: 3.23 μg/m3
Ozone: 74.46 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:31 PM
Daylight: 14 hrs 53 mins
Moon Transit: 9:12 PM
Moonset: 1:45 AM
Moon Phase: First Quarter
Moon Illumination: 71.7%
Best Times for Fishing or Hunting
Major Periods
8:16 AM - 10:46 AM8:42 PM - 11:12 PM
Minor Periods
3:35 PM - 5:05 PM1:15 AM - 2:45 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 23.64 μg/m3
Sulphur Dioxide: 3.1 μg/m3
Ozone: 41.88 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