Water Temperature of the Rock River in Byron, IL

Current Water Temperature

56.7°F

Measurement Time: Thursday, May 7, 2026, 2:15 AM CDT

Temperature Locations

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Local Points of Interest

River Park East; Hamas Park; Sunshine Park; Byron Forest Preserve District

Rock River

Station Name: ROCK RIVER AT BYRON, IL
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 679 feet

Nearest Address:
State Rte 72
Byron, IL 61010
Ogle County

GPS Coordinates: 42.12218889, -89.2553639

Nearby Water Temperatures

Mississippi River, Fulton, IL (48.7 mi)
Mississippi River, Fulton, IL (48.9 mi)
Beaver Slough, Clinton, IA (52.2 mi)
Fox River, McHenry, IL (53.2 mi)
Mississippi River, Camanche, IA (56.4 mi)
Illinois River, Utica, IL (56.9 mi)
Sugar River, Verona, WI (59 mi)
Mississippi River, Bellevue, IA (60.5 mi)
Badger Mill Creek, Verona, WI (60.8 mi)
Swan Creek, Fitchburg, WI (60.9 mi)
Illinois River, Marseilles, IL (61.7 mi)
Fox River, Burlington, WI (62.5 mi)
Lake Monona, Madison, WI (65.4 mi)
Eagle Spring Lake, Mukwonago, WI (65.6 mi)
Illinois River, Seneca, IL (65.7 mi)

Weather for Byron, Illinois

Current Weather

47.3°F
Partly cloudy
Partly cloudy
42.3°F
47.8°F
42%
SW 11 mph
12.6 mph
45.9°F
30.2°F
0 in
50%
9 mi
1016 mbar
1.8

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 64°F
L: 33°F
Patchy rain nearby
Fri
H: 58°F
L: 41°F
Patchy rain nearby
Sat
H: 70°F
L: 43°F
Heavy rain
Sun
H: 59°F
L: 42°F
Sunny
Mon
H: 61°F
L: 38°F

Air Quality

AQI: 1 - Good
PM2.5: 8.95 μg/m3
PM10: 10.35 μg/m3
Carbon Monoxide: 135.85 μg/m3
Nitrogen Dioxide: 1.45 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 104 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:53 AM
Sunset: 8:03 PM
Daylight: 14 hrs 18 mins
Moonrise: 1:00 AM
Moon Transit: 5:22 AM
Moonset: 9:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:52 AM - 7:22 AM
5:23 PM - 7:53 PM

Minor Periods

9:20 AM - 10:50 AM
12:30 AM - 2:00 AM

Action Rating: 3 out of 5

Frost Advisory issued May 6 at 9:01PM CDT until May 7 at 8:00AM CDT by NWS Chicago IL

Effective: Wed May 6, 2026, 9:01 PM
Expires: Thu May 7, 2026, 7:15 AM

* WHAT...Temperatures in the low to mid 30s and areas of frost. * WHERE...Portions of north central and northeast Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 7 at 3:06AM CDT until May 7 at 8:00AM CDT by NWS Chicago IL

Effective: Thu May 7, 2026, 3:06 AM
Expires: Thu May 7, 2026, 8:00 AM

* WHAT...Temperatures as low as the lower 30s will result in some areas of frost early this morning. * WHERE...Portions of north central and northeast Illinois. * WHEN...Until 8 AM CDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Flood Warning issued May 6 at 4:03PM CDT until May 7 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Wed May 6, 2026, 4:03 PM
Expires: Thu May 7, 2026, 4:15 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until tomorrow morning. * IMPACTS...At 9.0 feet, Floodwaters affect property of a home on South Christian Road on the east side of the river in the Afton area. There is minor erosional flood damage to lowland and agricultural land in the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 3:00 PM CDT Wednesday the stage was 9.2 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Wednesday was 9.3 feet. - Forecast...The river is expected to fall below flood stage just after midnight tonight and continue falling to 7.8 feet Wednesday, May 13. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.2 feet on 05/04/1951. - http://www.weather.gov/safety/flood

Caution is urged when walking near riverbanks. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Additional information is available at www.weather.gov. The next statement will be issued late tonight at 415 AM CDT.


Flood Warning issued May 6 at 9:54PM CDT until May 7 at 10:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Wed May 6, 2026, 9:54 PM
Expires: Thu May 7, 2026, 10:00 AM

...The Flood Warning is extended for the following rivers in Illinois...Wisconsin... Rock River At Afton affecting Winnebago and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until late tomorrow morning. * IMPACTS...At 9.0 feet, Floodwaters affect property of a home on South Christian Road on the east side of the river in the Afton area. There is minor erosional flood damage to lowland and agricultural land in the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 9:00 PM CDT Wednesday the stage was 9.1 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Wednesday was 9.2 feet. - Forecast...The river is expected to fall below flood stage early Thursday morning and continue falling to 7.6 feet by Wednesday, May 13. - Flood stage is 9.0 feet. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued Thursday morning at 1000 AM CDT.


Frost Advisory issued May 7 at 3:24AM CDT until May 7 at 8:00AM CDT by NWS Quad Cities IA IL

Effective: Thu May 7, 2026, 3:24 AM
Expires: Thu May 7, 2026, 8:00 AM

* WHAT...Temperatures in the lower to middle 30s will result in frost formation. * WHERE...Portions of north central and northwest Illinois and east central and northeast Iowa. * WHEN...Until 8 AM CDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Thursday, May 7, 2026

Weather Forecast

Patchy rain nearby
63.7°F
33.1°F
47.5°F
57%
0 in
65%
0%
15.4 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 6.22 μg/m3
PM10: 6.83 μg/m3
Carbon Monoxide: 151.89 μg/m3
Nitrogen Dioxide: 7.78 μg/m3
Sulphur Dioxide: 1.18 μg/m3
Ozone: 66.56 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:53 AM
Sunset: 8:03 PM
Daylight: 14 hrs 18 mins
Moonrise: 1:00 AM
Moon Transit: 5:22 AM
Moonset: 9:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:52 AM - 7:22 AM
5:23 PM - 7:53 PM

Minor Periods

9:20 AM - 10:50 AM
12:30 AM - 2:00 AM

Action Rating: 3 out of 5

Friday, May 8, 2026

Weather Forecast

Patchy rain nearby
58.4°F
41.4°F
49.1°F
79%
0.05 in
81%
0%
12.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 13.82 μg/m3
PM10: 15.76 μg/m3
Carbon Monoxide: 165.97 μg/m3
Nitrogen Dioxide: 8.89 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 72.28 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:53 AM
Sunset: 8:04 PM
Daylight: 14 hrs 20 mins
Moonrise: 1:34 AM
Moon Transit: 6:11 AM
Moonset: 10:55 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

5:41 AM - 8:11 AM
6:10 PM - 8:40 PM

Minor Periods

10:25 AM - 11:55 AM
1:04 AM - 2:34 AM

Action Rating: 3 out of 5

Saturday, May 9, 2026

Weather Forecast

Patchy rain nearby
70.4°F
42.9°F
56.8°F
77%
0.08 in
84%
0%
19.5 mph
3


Air Quality

AQI: 2 - Moderate
PM2.5: 16.76 μg/m3
PM10: 18.75 μg/m3
Carbon Monoxide: 153.69 μg/m3
Nitrogen Dioxide: 10.97 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 73.44 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:53 AM
Sunset: 8:05 PM
Daylight: 14 hrs 23 mins
Moonrise: 2:03 AM
Moon Transit: 6:57 AM
Moonset: 12:01 AM
Moon Phase: Last Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

6:27 AM - 8:57 AM
6:56 PM - 9:26 PM

Minor Periods

11:31 AM - 1:01 PM
1:33 AM - 3:03 AM

Action Rating: 2 out of 5

Sunday, May 10, 2026

Weather Forecast

Heavy rain
58.5°F
42.1°F
51.1°F
81%
0.93 in
84%
0%
16.1 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 6.97 μg/m3
PM10: 7.4 μg/m3
Carbon Monoxide: 150.67 μg/m3
Nitrogen Dioxide: 8.31 μg/m3
Sulphur Dioxide: 1.69 μg/m3
Ozone: 67 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:53 AM
Sunset: 8:06 PM
Daylight: 14 hrs 25 mins
Moonrise: 2:28 AM
Moon Transit: 7:42 AM
Moonset: 1:08 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:12 AM - 9:42 AM
7:41 PM - 10:11 PM

Minor Periods

12:38 AM - 2:08 PM
1:58 AM - 3:28 AM

Action Rating: 3 out of 5

Monday, May 11, 2026

Weather Forecast

Sunny
61.3°F
37.6°F
47.2°F
68%
0 in
0%
0%
10.3 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 2.97 μg/m3
PM10: 3.07 μg/m3
Carbon Monoxide: 157.93 μg/m3
Nitrogen Dioxide: 7.81 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 59.62 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:53 AM
Sunset: 8:07 PM
Daylight: 14 hrs 27 mins
Moonrise: 2:50 AM
Moon Transit: 8:27 AM
Moonset: 2:17 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

7:57 AM - 10:27 AM
8:25 PM - 10:55 PM

Minor Periods

1:47 PM - 3:17 PM
2:20 AM - 3:50 AM

Action Rating: 3 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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