Weather for Chatham, Illinois
Current Weather
Five Day Weather Forecast
Tue
H: 60°F
L: 51°F
Wed
H: 59°F
L: 48°F
Thu
H: 63°F
L: 44°F
Fri
H: 57°F
L: 42°F
Sat
H: 59°F
L: 40°F
Air Quality
Nitrogen Dioxide: 7.15 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 77 μg/m3
Astronomical
Sun Transit: 12:56 AM
Sunset: 7:50 PM
Daylight: 13 hrs 47 mins
Moon Transit: 11:02 PM
Moonset: 4:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.6%
Best Times for Fishing or Hunting
Major Periods
10:14 AM - 12:44 AM12:00 AM - 12:00 AM
Minor Periods
4:39 PM - 6:09 PM3:54 AM - 5:24 AM
Action Rating: 2 out of 5
Flood Warning issued April 27 at 9:51PM CDT by NWS Lincoln IL
Effective: Mon April 27, 2026, 9:51 PM
Expires: Tue April 28, 2026, 2:00 PM
...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Mason and Cass Counties. Illinois River at Beardstown affecting Brown, Schuyler, Cass and Morgan Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Beardstown. * WHEN...Until further notice. * IMPACTS...At 18.0 feet, Seepage problems begin in the Lost Creek Drainage and Levee District. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 16.6 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:45 PM CDT Monday was 16.6 feet. - Forecast...The river is expected to rise to a crest of 16.6 feet just after midnight tonight. It will then rise to 17.5 feet Thursday evening. Additional rises are possible thereafter. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Caution is urged when walking near riverbanks. Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.
Flood Warning issued April 28 at 11:25AM CDT until May 6 at 1:00AM CDT by NWS St Louis MO
Effective: Tue April 28, 2026, 11:25 AM
Expires: Wed April 29, 2026, 11:30 PM
...The National Weather Service in St Louis has issued a Flood Warning for the following rivers in Illinois... Illinois River at La Grange LD. Illinois River at Meredosia. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is forecast. * WHERE...Illinois River at Meredosia. * WHEN...From late Wednesday night to Wednesday, May 06. * IMPACTS...At 18.0 feet, City of Meredosia plugs storm sewer outlets. * ADDITIONAL DETAILS... - At 11:00 AM CDT Tuesday the stage was 16.0 feet. - Forecast...The river is expected to rise above flood stage early Thursday morning to a crest of 17.8 feet Friday evening. It will then fall below flood stage Monday evening. - Flood stage is 17.0 feet.
Motorists should not attempt to drive around barricades or drive cars through flooded areas. Be especially cautious at night when it is harder to recognize the dangers of flooding. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Flood Warning issued April 28 at 10:20AM CDT by NWS Lincoln IL
Effective: Tue April 28, 2026, 10:20 AM
Expires: Wed April 29, 2026, 2:30 AM
...Forecast flooding changed from Minor to Moderate severity for the following rivers in Illinois... Illinois River at Beardstown affecting Brown, Schuyler, Morgan and Cass Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and moderate flooding is forecast. * WHERE...Illinois River at Beardstown. * WHEN...Until further notice. * IMPACTS...At 18.0 feet, Seepage problems begin in the Lost Creek Drainage and Levee District. * ADDITIONAL DETAILS... - At 9:45 AM CDT Tuesday the stage was 16.9 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:45 AM CDT Tuesday was 16.9 feet. - Forecast...The river is expected to rise to a crest of 18.5 feet Thursday morning. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.
Flood Warning issued April 27 at 9:51PM CDT by NWS Lincoln IL
Effective: Mon April 27, 2026, 9:51 PM
Expires: Tue April 28, 2026, 2:00 PM
...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Mason and Cass Counties. Illinois River at Beardstown affecting Brown, Schuyler, Cass and Morgan Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River near Havana. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 16.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:45 PM CDT Monday was 16.3 feet. - Forecast...The river is expected to rise to a crest of 16.6 feet Wednesday morning. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Caution is urged when walking near riverbanks. Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.
Flood Warning issued April 28 at 10:20AM CDT by NWS Lincoln IL
Effective: Tue April 28, 2026, 10:20 AM
Expires: Wed April 29, 2026, 2:30 AM
...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Mason, Fulton and Cass Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River near Havana. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 9:45 AM CDT Tuesday the stage was 16.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:45 AM CDT Tuesday was 16.4 feet. - Forecast...The river will rise to 16.6 feet tomorrow morning. It will then fall Friday evening. It will rise to 16.3 feet Sunday morning. It will then fall again but remain above flood stage. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov.
Weather Forecast
Air Quality
Nitrogen Dioxide: 3.93 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 81 μg/m3
Astronomical
Sun Transit: 12:56 AM
Sunset: 7:50 PM
Daylight: 13 hrs 47 mins
Moon Transit: 11:02 PM
Moonset: 4:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.6%
Best Times for Fishing or Hunting
Major Periods
10:14 AM - 12:44 AM12:00 AM - 12:00 AM
Minor Periods
4:39 PM - 6:09 PM3:54 AM - 5:24 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 5.12 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 81.96 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:51 PM
Daylight: 13 hrs 49 mins
Moon Transit: 11:44 PM
Moonset: 4:45 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%
Best Times for Fishing or Hunting
Major Periods
10:55 AM - 1:25 PM12:00 AM - 12:00 AM
Minor Periods
5:43 PM - 7:13 PM4:15 AM - 5:45 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 5.58 μg/m3
Sulphur Dioxide: 1.49 μg/m3
Ozone: 82.44 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:52 PM
Daylight: 13 hrs 51 mins
Moon Transit: 12:00 AM
Moonset: 5:08 AM
Moon Phase: Full
Moon Illumination: 99.0%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM11:38 AM - 2:08 PM
Minor Periods
6:45 PM - 8:15 PM4:38 AM - 6:08 AM
Action Rating: 5 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.06 μg/m3
Sulphur Dioxide: 1.46 μg/m3
Ozone: 80.64 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:53 PM
Daylight: 13 hrs 54 mins
Moon Transit: 12:27 AM
Moonset: 5:32 AM
Moon Phase: Full
Moon Illumination: 100.0%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM12:23 AM - 2:53 PM
Minor Periods
7:49 PM - 9:19 PM5:02 AM - 6:32 AM
Action Rating: 4 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 11.13 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 55.31 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:54 PM
Daylight: 13 hrs 56 mins
Moon Transit: 1:13 AM
Moonset: 6:02 AM
Moon Phase: Full
Moon Illumination: 98.4%
Best Times for Fishing or Hunting
Major Periods
12:43 AM - 3:13 AM1:09 PM - 3:39 PM
Minor Periods
8:52 PM - 10:22 PM5:32 AM - 7:02 AM
Action Rating: 4 out of 5