Weather for Alton, Illinois
Current Weather
Five Day Weather Forecast
Fri
H: 89°F
L: 56°F
Sat
H: 81°F
L: 65°F
Sun
H: 85°F
L: 65°F
Mon
H: 85°F
L: 69°F
Tue
H: 83°F
L: 61°F
Air Quality
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 126 μg/m3
Astronomical
Sun Transit: 12:56 AM
Sunset: 8:06 PM
Daylight: 14 hrs 19 mins
Moon Transit: 11:46 AM
Moonset: 7:12 PM
Moon Phase: New
Moon Illumination: 0.1%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM11:16 AM - 1:46 PM
Minor Periods
6:42 PM - 8:12 PM4:04 AM - 5:34 AM
Action Rating: 5 out of 5
Flood Warning issued May 14 at 7:36PM CDT until May 19 at 7:00PM CDT by NWS St Louis MO
Effective: Thu May 14, 2026, 7:36 PM
Expires: Sat May 16, 2026, 7:45 AM
...The Flood Warning continues for the following rivers in Illinois... 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...Kaskaskia River at Carlyle. * WHEN...Until Tuesday evening. * IMPACTS...At 20.3 feet, Township roads downstream in Covington begin flooding near this height. * ADDITIONAL DETAILS... - At 7:00 PM CDT Thursday the stage was 20.2 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 7:00 PM CDT Thursday was 20.2 feet. - Forecast...The river is expected to rise to a crest of 20.2 feet just after midnight tonight. It will then fall below flood stage early Monday afternoon. - Flood stage is 16.5 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: 8.65 μg/m3
Sulphur Dioxide: 2.42 μg/m3
Ozone: 84.08 μg/m3
Astronomical
Sun Transit: 12:56 AM
Sunset: 8:06 PM
Daylight: 14 hrs 19 mins
Moon Transit: 11:46 AM
Moonset: 7:12 PM
Moon Phase: New
Moon Illumination: 0.1%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM11:16 AM - 1:46 PM
Minor Periods
6:42 PM - 8:12 PM4:04 AM - 5:34 AM
Action Rating: 5 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 8.61 μg/m3
Sulphur Dioxide: 3.17 μg/m3
Ozone: 86 μg/m3
Astronomical
Sun Transit: 12:57 AM
Sunset: 8:07 PM
Daylight: 14 hrs 20 mins
Moon Transit: 12:46 AM
Moonset: 8:33 PM
Moon Phase: New
Moon Illumination: 2.0%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM12:16 AM - 2:46 PM
Minor Periods
8:03 PM - 9:33 PM4:41 AM - 6:11 AM
Action Rating: 5 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 6.67 μg/m3
Sulphur Dioxide: 2.38 μg/m3
Ozone: 87.36 μg/m3
Astronomical
Sun Transit: 12:57 AM
Sunset: 8:08 PM
Daylight: 14 hrs 22 mins
Moon Transit: 1:50 PM
Moonset: 9:50 PM
Moon Phase: New
Moon Illumination: 0.2%
Best Times for Fishing or Hunting
Major Periods
12:46 AM - 3:16 AM1:20 PM - 3:50 PM
Minor Periods
9:20 PM - 10:50 PM5:28 AM - 6:58 AM
Action Rating: 4 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.88 μg/m3
Sulphur Dioxide: 2.27 μg/m3
Ozone: 81.88 μg/m3
Astronomical
Sun Transit: 12:57 AM
Sunset: 8:09 PM
Daylight: 14 hrs 24 mins
Moon Transit: 2:57 PM
Moonset: 10:59 PM
Moon Phase: New
Moon Illumination: 2.6%
Best Times for Fishing or Hunting
Major Periods
1:52 AM - 4:22 AM2:27 PM - 4:57 PM
Minor Periods
10:29 PM - 11:59 PM6:26 AM - 7:56 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 6.01 μg/m3
Sulphur Dioxide: 2.07 μg/m3
Ozone: 58.62 μg/m3
Astronomical
Sun Transit: 12:57 AM
Sunset: 8:10 PM
Daylight: 14 hrs 25 mins
Moon Transit: 4:03 PM
Moonset: 11:56 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%
Best Times for Fishing or Hunting
Major Periods
2:59 AM - 5:29 AM3:33 PM - 6:03 PM
Minor Periods
12:00 AM - 12:00 AM7:35 AM - 9:05 AM
Action Rating: 3 out of 5