Weather for Romeoville, Illinois
Current Weather
Five Day Weather Forecast
Mon
H: 85°F
L: 49°F
Tue
H: 54°F
L: 46°F
Wed
H: 57°F
L: 42°F
Thu
H: 58°F
L: 45°F
Fri
H: 61°F
L: 47°F
Air Quality
Nitrogen Dioxide: 11.25 μg/m3
Sulphur Dioxide: 2.55 μg/m3
Ozone: 45 μg/m3
Astronomical
Sun Transit: 12:49 AM
Sunset: 7:54 PM
Daylight: 14 hrs 9 mins
Moon Transit: 2:44 AM
Moonset: 7:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%
Best Times for Fishing or Hunting
Major Periods
2:14 AM - 4:44 AM2:56 PM - 5:26 PM
Minor Periods
12:00 AM - 12:00 AM6:32 AM - 8:02 AM
Action Rating: 2 out of 5
Flood Warning issued May 3 at 10:02AM CDT until May 5 at 1:00PM CDT by NWS Chicago IL
Effective: Sun May 3, 2026, 10:02 AM
Expires: Mon May 4, 2026, 4:15 AM
...The Flood Warning is extended for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, McHenry and Kane Counties. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...Until early Tuesday afternoon. * IMPACTS...At 10.0 feet, Winaki Trail and Onaway Trail are threatened south of Algonquin. Athletic fields inundated at Judson College in Elgin. * ADDITIONAL DETAILS... - At 9:30 AM CDT Sunday the stage was 10.2 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Sunday was 10.6 feet. - Forecast...The river is forecast to continue to gradually fall through the middle of the week. - Flood stage is 9.5 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 07/18/2024. - http://www.weather.gov/safety/flood
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Flood Warning issued May 3 at 7:54PM CDT until May 5 at 7:00AM CDT by NWS Chicago IL
Effective: Sun May 3, 2026, 7:54 PM
Expires: Mon May 4, 2026, 2:00 PM
...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...Until Tuesday morning. * IMPACTS...At 10.0 feet, Winaki Trail and Onaway Trail are threatened south of Algonquin. Athletic fields inundated at Judson College in Elgin. * ADDITIONAL DETAILS... - At 7:30 PM CDT Sunday the stage was 10.0 feet. - Forecast...The river is forecast to continue to gradually fall through the middle of the week. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Monday afternoon.
Weather Forecast
Air Quality
Nitrogen Dioxide: 9.84 μg/m3
Sulphur Dioxide: 2.86 μg/m3
Ozone: 80.64 μg/m3
Astronomical
Sun Transit: 12:49 AM
Sunset: 7:54 PM
Daylight: 14 hrs 9 mins
Moon Transit: 2:44 AM
Moonset: 7:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%
Best Times for Fishing or Hunting
Major Periods
2:14 AM - 4:44 AM2:56 PM - 5:26 PM
Minor Periods
12:00 AM - 12:00 AM6:32 AM - 8:02 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 11.83 μg/m3
Sulphur Dioxide: 3.93 μg/m3
Ozone: 73.56 μg/m3
Astronomical
Sun Transit: 12:48 AM
Sunset: 7:55 PM
Daylight: 14 hrs 11 mins
Moon Transit: 3:35 AM
Moonset: 7:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%
Best Times for Fishing or Hunting
Major Periods
3:05 AM - 5:35 AM3:47 PM - 6:17 PM
Minor Periods
7:20 AM - 8:50 AM12:00 AM - 12:00 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 20.05 μg/m3
Sulphur Dioxide: 5.18 μg/m3
Ozone: 58.8 μg/m3
Astronomical
Sun Transit: 12:48 AM
Sunset: 7:56 PM
Daylight: 14 hrs 13 mins
Moon Transit: 4:27 AM
Moonset: 8:46 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.0%
Best Times for Fishing or Hunting
Major Periods
3:57 AM - 6:27 AM4:38 PM - 7:08 PM
Minor Periods
8:16 AM - 9:46 AM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 12.3 μg/m3
Sulphur Dioxide: 4.83 μg/m3
Ozone: 67.48 μg/m3
Astronomical
Sun Transit: 12:48 AM
Sunset: 7:57 PM
Daylight: 14 hrs 16 mins
Moon Transit: 5:17 AM
Moonset: 9:47 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%
Best Times for Fishing or Hunting
Major Periods
4:47 AM - 7:17 AM5:28 PM - 7:58 PM
Minor Periods
9:17 AM - 10:47 AM12:23 AM - 1:53 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 22.43 μg/m3
Sulphur Dioxide: 2.64 μg/m3
Ozone: 43.54 μg/m3
Astronomical
Sun Transit: 12:48 AM
Sunset: 7:58 PM
Daylight: 14 hrs 18 mins
Moon Transit: 6:06 AM
Moonset: 10:51 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%
Best Times for Fishing or Hunting
Major Periods
5:36 AM - 8:06 AM6:15 PM - 8:45 PM
Minor Periods
10:21 AM - 11:51 AM12:57 AM - 2:27 AM
Action Rating: 3 out of 5