Water Temperature of Lake Mendota in Madison, WI

Current Water Temperature

51.8°F

Measurement Time: Saturday, May 2, 2026, 10:15 AM CDT

Temperature Locations

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Local Points of Interest

Maple Bluff, WI; Shorewood Hills, WI; Middleton, WI; Waunakee, WI

Lake Mendota

Station Name: Madison 2NW
Data Source: USGS

Elevation Above Sea Level: 847 feet

Nearest Address:
Howard Temin Lakeshore Path
Madison, WI 53706
Dane County

GPS Coordinates: 43.0994, -89.4044

Nearby Water Temperatures

Lake Monona, Madison, WI (2.5 mi)
Pheasant Branch, Middleton, WI (5.4 mi)
Swan Creek, Fitchburg, WI (7.2 mi)
Yahara River, Windsor, WI (8 mi)
Badger Mill Creek, Verona, WI (10.9 mi)
Brewery Creek, Cross Plains, WI (11.8 mi)
Black Earth Creek, Cross Plains, WI (11.9 mi)
Sugar River, Verona, WI (12.6 mi)
Black Earth Creek, Cross Plains, WI (13.1 mi)
Black Earth Creek, Black Earth, WI (16.7 mi)
Eagle Spring Lake, Mukwonago, WI (51.8 mi)
Wisconsin River, Muscoda, WI (52.8 mi)
Fox River, Berlin, WI (63.2 mi)
Fond Du Lac River, Fond Du Lac, WI (67.7 mi)
Rock River, Byron, IL (67.9 mi)

Weather for Madison, Wisconsin

Current Weather

50.2°F
Partly cloudy
Partly cloudy
45.8°F
49.4°F
52%
WSW 11.4 mph
17 mph
43°F
33°F
0 in
75%
9 mi
1011 mbar
0.2

Five Day Weather Forecast

Sunny
Sun
H: 73°F
L: 46°F
Moderate rain
Mon
H: 70°F
L: 43°F
Partly Cloudy
Tue
H: 52°F
L: 40°F
Patchy rain nearby
Wed
H: 50°F
L: 34°F
Patchy rain nearby
Thu
H: 54°F
L: 36°F

Air Quality

AQI: 1 - Good
PM2.5: 7.95 μg/m3
PM10: 8.95 μg/m3
Carbon Monoxide: 152.85 μg/m3
Nitrogen Dioxide: 2.85 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 91 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:54 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 10:37 PM
Moon Transit: 2:00 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

1:30 AM - 4:00 AM
2:00 PM - 4:30 PM

Minor Periods

10:07 PM - 11:37 PM
5:52 AM - 7:22 AM

Action Rating: 4 out of 5

Flood Warning issued May 2 at 4:22PM CDT until May 3 at 7:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Sat May 2, 2026, 4:22 PM
Expires: Sun May 3, 2026, 4:30 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Rock and Winnebago 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 Fort Atkinson. * WHEN...Until tomorrow evening. * IMPACTS...At 16.0 feet, Floodwaters affect some park land and boat launches. * ADDITIONAL DETAILS... - At 3:00 PM CDT Saturday the stage was 16.1 feet. - Bankfull stage is 14.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Saturday was 16.3 feet. - Forecast...The river is expected to fall below flood stage early tomorrow afternoon and continue falling to 14.7 feet Saturday, May 09. - Flood stage is 16.0 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 late tonight at 430 AM CDT.


Flood Warning issued May 2 at 4:22PM CDT until May 5 at 7:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Sat May 2, 2026, 4:22 PM
Expires: Sun May 3, 2026, 4:30 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Rock and Winnebago 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 Tuesday evening. * IMPACTS...At 10.5 feet, Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake. * ADDITIONAL DETAILS... - At 3:00 PM CDT Saturday the stage was 10.5 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Saturday was 10.7 feet. - Forecast...The river is expected to fall below flood stage early Tuesday afternoon and continue falling to 9.4 feet Saturday, May 09. - Flood stage is 10.0 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 late tonight at 430 AM CDT.


Flood Warning issued May 2 at 9:26PM CDT until May 3 at 7:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Sat May 2, 2026, 9:26 PM
Expires: Sun May 3, 2026, 9:30 AM

...The Flood Warning is extended for the following river 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 Rock and Winnebago Counties. Rock River At Newville affecting Rock County. Rock River At Fort Atkinson affecting Jefferson County. 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 Fort Atkinson. * WHEN...Until tomorrow evening. * IMPACTS...At 16.0 feet, Floodwaters affect some park land and boat launches. * ADDITIONAL DETAILS... - At 9:00 PM CDT Saturday the stage was 16.1 feet. - Bankfull stage is 14.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Saturday was 16.2 feet. - Forecast...The river is expected to rise to a crest of 16.1 feet just after midnight tonight. It will then fall below flood stage early tomorrow afternoon. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 16.2 feet on 08/29/2007. - 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 Sunday morning at 930 AM CDT.


Flood Warning issued May 2 at 9:26PM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Sat May 2, 2026, 9:26 PM
Expires: Sun May 3, 2026, 9:30 AM

...The Flood Warning is extended for the following river 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 Rock and Winnebago Counties. Rock River At Newville affecting Rock County. Rock River At Fort Atkinson affecting Jefferson County. 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 10.5 feet, Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake. * ADDITIONAL DETAILS... - At 9:00 PM CDT Saturday the stage was 10.5 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Saturday was 10.6 feet. - Forecast...The river is expected to rise to a crest of 10.5 feet just after midnight tonight. It will then fall below flood stage Wednesday morning. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.5 feet on 08/30/2007. - 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 Sunday morning at 930 AM CDT.


Flood Warning issued May 2 at 4:22PM CDT until May 7 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Sat May 2, 2026, 4:22 PM
Expires: Sun May 3, 2026, 4:30 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Rock and Winnebago 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 Thursday morning. * IMPACTS...At 10.0 feet, Floodwaters affect the property of a home on South Christian Road on the east side of the river in the Afton area. Minor erosional flood damage occurs to lowland and agricultural land adjacent to the river the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 4:00 PM CDT Saturday the stage was 9.8 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 4:00 PM CDT Saturday was 10.1 feet. - Forecast...The river is expected to fall below flood stage early Thursday morning and continue falling to 8.6 feet Saturday, May 09. - 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 late tonight at 430 AM CDT.
Sunday, May 3, 2026

Weather Forecast

Sunny
72.9°F
45.5°F
55°F
57%
0 in
0%
0%
18.1 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 7.17 μg/m3
PM10: 8.08 μg/m3
Carbon Monoxide: 154.41 μg/m3
Nitrogen Dioxide: 5.01 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 79.36 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:54 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 10:37 PM
Moon Transit: 2:00 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

1:30 AM - 4:00 AM
2:00 PM - 4:30 PM

Minor Periods

10:07 PM - 11:37 PM
5:52 AM - 7:22 AM

Action Rating: 4 out of 5

Monday, May 4, 2026

Weather Forecast

Moderate rain
70°F
42.5°F
55°F
76%
0.68 in
84%
0%
17.7 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 7.05 μg/m3
PM10: 8.22 μg/m3
Carbon Monoxide: 160.29 μg/m3
Nitrogen Dioxide: 6.07 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 80.88 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:54 AM
Sunset: 8:03 PM
Daylight: 14 hrs 16 mins
Moonrise: 11:33 PM
Moon Transit: 2:50 AM
Moonset: 7:01 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%

Best Times for Fishing or Hunting

Major Periods

2:20 AM - 4:50 AM
2:50 PM - 5:20 PM

Minor Periods

12:00 AM - 12:00 AM
6:31 AM - 8:01 AM

Action Rating: 2 out of 5

Tuesday, May 5, 2026

Weather Forecast

Partly Cloudy
51.7°F
40°F
46.1°F
67%
0 in
0%
0%
11.4 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 4.38 μg/m3
PM10: 4.78 μg/m3
Carbon Monoxide: 146.61 μg/m3
Nitrogen Dioxide: 4.72 μg/m3
Sulphur Dioxide: 1.77 μg/m3
Ozone: 74.64 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:54 AM
Sunset: 8:04 PM
Daylight: 14 hrs 18 mins
Moonrise: 12:33 AM
Moon Transit: 3:41 AM
Moonset: 7:49 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

3:11 AM - 5:41 AM
3:42 PM - 6:12 PM

Minor Periods

7:19 AM - 8:49 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, May 6, 2026

Weather Forecast

Patchy rain nearby
49.8°F
34.3°F
43°F
65%
0.01 in
89%
0%
6.7 mph
5.4


Air Quality

AQI: 1 - Good
PM2.5: 2.73 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 154.03 μg/m3
Nitrogen Dioxide: 4.13 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 69.32 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:54 AM
Sunset: 8:05 PM
Daylight: 14 hrs 21 mins
Moonrise: 12:23 AM
Moon Transit: 4:32 AM
Moonset: 8:45 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

8:15 AM - 9:45 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, May 7, 2026

Weather Forecast

Patchy rain nearby
54.2°F
36.4°F
44°F
67%
0.04 in
60%
0%
15.9 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 2.93 μg/m3
PM10: 2.99 μg/m3
Carbon Monoxide: 158.77 μg/m3
Nitrogen Dioxide: 5.89 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 54.69 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:54 AM
Sunset: 8:06 PM
Daylight: 14 hrs 23 mins
Moonrise: 1:04 AM
Moon Transit: 5:23 AM
Moonset: 9:46 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

9:16 AM - 10:46 AM
12:34 AM - 2:04 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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