Water Temperature of the Rock River in Byron, IL

Current Water Temperature

59.0°F

Measurement Time: Tuesday, May 5, 2026, 1:15 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

46.9°F
Overcast
Overcast
43.6°F
52.2°F
44%
N 6.7 mph
8.9 mph
49.5°F
21.9°F
0 in
100%
9 mi
1010 mbar
0.7

Five Day Weather Forecast

Sunny
Tue
H: 66°F
L: 46°F
Overcast
Wed
H: 52°F
L: 39°F
Patchy rain nearby
Thu
H: 60°F
L: 36°F
Patchy rain nearby
Fri
H: 60°F
L: 44°F
Sunny
Sat
H: 66°F
L: 42°F

Air Quality

AQI: 1 - Good
PM2.5: 2.15 μg/m3
PM10: 2.55 μg/m3
Carbon Monoxide: 143.85 μg/m3
Nitrogen Dioxide: 1.65 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:53 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 12:28 AM
Moon Transit: 3:40 AM
Moonset: 7:53 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

3:10 AM - 5:40 AM
3:42 PM - 6:12 PM

Minor Periods

7:23 AM - 8:53 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Flood Warning issued May 4 at 4:07PM CDT until May 7 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 4:07 PM
Expires: Tue May 5, 2026, 4:15 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until early Thursday afternoon. * 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 Monday the stage was 9.5 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Monday was 9.6 feet. - Forecast...The river is expected to fall below flood stage Thursday morning and continue falling to 8.2 feet Monday, May 11. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 03/29/2011. - 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 late tonight at 415 AM CDT.


Flood Warning issued May 4 at 9:18PM CDT until May 7 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 9:18 PM
Expires: Tue May 5, 2026, 9:30 AM

...The Flood Warning is extended for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until early Thursday afternoon. * 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 8:00 PM CDT Monday the stage was 9.4 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 9.5 feet. - Forecast...The river is expected to rise to a crest of 9.4 feet just after midnight tonight. It will then fall below flood stage Thursday morning. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 03/29/2011. - 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 Tuesday morning at 930 AM CDT.


Flood Warning issued May 5 at 2:32AM CDT until May 7 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 2:32 AM
Expires: Tue May 5, 2026, 2:45 PM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until early Thursday afternoon. * 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 2:00 AM CDT Tuesday the stage was 9.3 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 2:00 AM CDT Tuesday was 9.5 feet. - Forecast...The river is expected to fall below flood stage Thursday morning and continue falling to 8.1 feet Monday evening. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 03/29/2020. - 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 this afternoon at 245 PM CDT.


Flood Warning issued May 4 at 4:07PM CDT until May 6 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 4:07 PM
Expires: Tue May 5, 2026, 4:15 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until Wednesday morning. * IMPACTS...At 10.0 feet, Floodwaters affect homes and boat docks in the Blackhawk Island area of Lake Koshkonong on the north side of the lake. Floodwaters spread over low spots on Blackhawk Island Road in the area where the Rock River enters the lake. * ADDITIONAL DETAILS... - At 3:00 PM CDT Monday the stage was 10.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Monday was 10.4 feet. - Forecast...The river is expected to fall below flood stage early Wednesday morning and continue falling to 9.1 feet Monday, May 11. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.1 feet on 03/30/2011. - 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 late tonight at 415 AM CDT.


Flood Warning issued May 4 at 9:18PM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 9:18 PM
Expires: Tue May 5, 2026, 9:30 AM

...The Flood Warning is extended for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until early Wednesday afternoon. * IMPACTS...At 10.0 feet, Floodwaters affect homes and boat docks in the Blackhawk Island area of Lake Koshkonong on the north side of the lake. Floodwaters spread over low spots on Blackhawk Island Road in the area where the Rock River enters the lake. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 10.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 10.3 feet. - Forecast...The river is expected to fall below flood stage Wednesday morning and continue falling to 9.0 feet Monday, May 11. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.1 feet on 03/30/2011. - 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 Tuesday morning at 930 AM CDT.


Tuesday, May 5, 2026

Weather Forecast

Sunny
66.2°F
46°F
55.1°F
38%
0 in
0%
0%
10.7 mph
4.9


Air Quality

AQI: 1 - Good
PM2.5: 4.19 μg/m3
PM10: 4.88 μg/m3
Carbon Monoxide: 147.89 μg/m3
Nitrogen Dioxide: 4.88 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:53 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 12:28 AM
Moon Transit: 3:40 AM
Moonset: 7:53 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

3:10 AM - 5:40 AM
3:42 PM - 6:12 PM

Minor Periods

7:23 AM - 8:53 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, May 6, 2026

Weather Forecast

Overcast
52°F
39.2°F
46°F
62%
0 in
0%
0%
12.1 mph
5.2


Air Quality

AQI: 1 - Good
PM2.5: 3.03 μg/m3
PM10: 3.21 μg/m3
Carbon Monoxide: 148.89 μg/m3
Nitrogen Dioxide: 4.92 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 68.04 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:53 AM
Sunset: 8:02 PM
Daylight: 14 hrs 16 mins
Moonrise: 12:18 AM
Moon Transit: 4:32 AM
Moonset: 8:49 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.0%

Best Times for Fishing or Hunting

Major Periods

4:02 AM - 6:32 AM
4:33 PM - 7:03 PM

Minor Periods

8:19 AM - 9:49 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, May 7, 2026

Weather Forecast

Patchy rain nearby
59.5°F
36.1°F
48.3°F
62%
0.03 in
85%
0%
13.6 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 3.52 μg/m3
PM10: 3.62 μg/m3
Carbon Monoxide: 145.97 μg/m3
Nitrogen Dioxide: 4.79 μg/m3
Sulphur Dioxide: 1.02 μg/m3
Ozone: 64.08 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
60°F
44.3°F
51.2°F
76%
0.01 in
82%
0%
11.2 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 8.23 μg/m3
PM10: 9.18 μg/m3
Carbon Monoxide: 159.85 μg/m3
Nitrogen Dioxide: 7.66 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 64.48 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

Sunny
66°F
41.7°F
52.2°F
64%
0 in
0%
0%
12.3 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 14.3 μg/m3
PM10: 15.93 μg/m3
Carbon Monoxide: 194.27 μg/m3
Nitrogen Dioxide: 11.6 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 66.08 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

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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