Water Temperature of Lake Mendota in Madison, WI

Current Water Temperature

48.9°F

Measurement Time: Thursday, April 16, 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

66°F
Clear
Clear
66°F
61.6°F
56%
SW 3.4 mph
7 mph
61.2°F
56.4°F
0 in
25%
9 mi
1011 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 69°F
L: 53°F
Moderate rain
Fri
H: 83°F
L: 51°F
Patchy rain nearby
Sat
H: 51°F
L: 34°F
Partly Cloudy
Sun
H: 47°F
L: 30°F
Sunny
Mon
H: 57°F
L: 30°F

Air Quality

AQI: 1 - Good
PM2.5: 17.35 μg/m3
PM10: 17.95 μg/m3
Carbon Monoxide: 205.85 μg/m3
Nitrogen Dioxide: 14.55 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 47 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 12:57 AM
Sunset: 7:41 PM
Daylight: 13 hrs 27 mins
Moonrise: 5:32 AM
Moon Transit: 12:12 AM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:42 AM - 2:12 PM

Minor Periods

6:38 PM - 8:08 PM
5:02 AM - 6:32 AM

Action Rating: 5 out of 5

Flood Warning issued April 16 at 11:06AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu April 16, 2026, 11:06 AM
Expires: Thu April 16, 2026, 11:15 PM

...The National Weather Service in Milwaukee/Sullivan WI has issued a Flood Warning for the following river in Wisconsin... Black Earth Creek At Mazomanie affecting Dane County. * WHAT...Minor flooding is occurring. * WHERE...Black Earth Creek at Mazomanie. * WHEN...From this morning until further notice. * ADDITIONAL DETAILS... - At 8:45 AM CDT Thursday the stage was 11.2 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:45 AM CDT Thursday was 13.9 feet. - Forecast...No forecast is available for this location. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.7 feet on 03/15/2019. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. 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 this evening at 1115 PM CDT.


Flood Watch issued April 16 at 3:11PM CDT until April 18 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu April 16, 2026, 3:11 PM
Expires: Thu April 16, 2026, 11:15 PM

* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of east central, south central, and southeast Wisconsin, including the following counties, in east central Wisconsin, Fond du Lac and Sheboygan. In south central Wisconsin, Dane, Green, Green Lake, Iowa, Lafayette, Marquette and Rock. In southeast Wisconsin, Dodge, Jefferson, Kenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington and Waukesha. * WHEN...From Friday afternoon through Saturday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - Excessive rain on saturated ground may result in flooding. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.


Flood Warning issued April 16 at 4:38AM CDT until April 18 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu April 16, 2026, 4:38 AM
Expires: Thu April 16, 2026, 4:45 PM

...The National Weather Service in Milwaukee/Sullivan WI has issued a Flood Warning for the following rivers in Wisconsin... Baraboo River Near Baraboo affecting Sauk and Columbia Counties. * WHAT...Minor flooding is occurring. * WHERE...Baraboo River near Baraboo. * WHEN...From early this morning to early Saturday afternoon. * IMPACTS...At 16.0 feet, The effects of flooding at this level are confined mainly to agricultural land. * ADDITIONAL DETAILS... - At 4:00 AM CDT Thursday the stage was 16.1 feet. - Bankfull stage is 14.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 4:00 AM CDT Thursday was 16.1 feet. - Forecast...The river will crest to at least near 17.0 feet through this afternoon. Coming forecasts will identify a more precise crest value. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 16.99 feet on April 12, 2013. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 445 PM CDT.


Flash Flood Watch issued April 16 at 12:46PM CDT until April 19 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu April 16, 2026, 12:46 PM
Expires: Thu April 16, 2026, 9:00 PM

* WHAT...Flash flooding due to the potential compromise of the Caledonia-Lewiston Levee. The Wisconsin Department of Natural Resources has indicated that the Calendonia-Lewiston Levee along the Wisconsin River may become compromised as the river levels rise. If this takes place, a rapid inundation of water is expected along the south and west side of the river. The City of Portage is not anticipated to be impacted by a potential compromise of the Caledonia-Lewiston Levee. * WHERE...A portion of south central Wisconsin, including the following counties, Columbia and Sauk along the south and west side of the Wisconsin River. Areas affected include, but are not limited to the Pine Island State Wildlife Area and portions of Highway 33. The City of Portage is not anticipated to be impacted by a potential compromise of the Caledonia-Lewiston Levee. * WHEN...Through Sunday morning. * IMPACTS...A compromised levee may result in flash flooding of low-lying areas along the Caledonia-Lewiston Levee. * ADDITIONAL DETAILS... - Excessive rainfall has resulted in very high water level on the Wisconsin River. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials.


Flood Warning issued April 16 at 10:56AM CDT until April 19 at 5:30AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu April 16, 2026, 10:56 AM
Expires: Thu April 16, 2026, 11:00 PM

...Forecast flooding changed to Minor severity and increased in duration for the following river in Wisconsin... Baraboo River Near Baraboo affecting Columbia and Sauk Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Baraboo River near Baraboo. * WHEN...Until early Sunday morning. * IMPACTS...At 17.0 feet, If Wisconsin River at Portage up to 17 feet also, water impacts parking lots near Hwy 33 and water over Tritz Rd near Hwy 33. There is widespread flooding of agricultural land. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 16.4 feet. - Bankfull stage is 14.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Thursday was 16.5 feet. - Forecast...The river is expected to rise to a crest of 17.2 feet early tomorrow afternoon. It will then fall below flood stage late Saturday evening. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 17.3 feet on 04/15/2014. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. 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 this evening at 1100 PM CDT.


Thursday, April 16, 2026

Weather Forecast

Patchy rain nearby
69.4°F
53.4°F
60.5°F
83%
0.01 in
82%
0%
9.2 mph
1.7


Air Quality

AQI: 1 - Good
PM2.5: 4.94 μg/m3
PM10: 5.68 μg/m3
Carbon Monoxide: 204.69 μg/m3
Nitrogen Dioxide: 6.4 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 66.4 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 12:57 AM
Sunset: 7:41 PM
Daylight: 13 hrs 27 mins
Moonrise: 5:32 AM
Moon Transit: 12:12 AM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:42 AM - 2:12 PM

Minor Periods

6:38 PM - 8:08 PM
5:02 AM - 6:32 AM

Action Rating: 5 out of 5

Friday, April 17, 2026

Weather Forecast

Moderate rain
82.8°F
50.7°F
63.9°F
87%
0.51 in
84%
0%
22.8 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 12.63 μg/m3
PM10: 13.44 μg/m3
Carbon Monoxide: 218.17 μg/m3
Nitrogen Dioxide: 10.81 μg/m3
Sulphur Dioxide: 2.47 μg/m3
Ozone: 70.48 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 12:57 AM
Sunset: 7:43 PM
Daylight: 13 hrs 30 mins
Moonrise: 5:56 AM
Moon Transit: 1:04 PM
Moonset: 8:29 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:13 AM - 2:43 AM
12:34 AM - 3:04 PM

Minor Periods

7:59 PM - 9:29 PM
5:26 AM - 6:56 AM

Action Rating: 4 out of 5

Saturday, April 18, 2026

Weather Forecast

Patchy rain nearby
50.5°F
34°F
41.6°F
68%
0.12 in
83%
0%
20.4 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 3.61 μg/m3
PM10: 3.79 μg/m3
Carbon Monoxide: 158.33 μg/m3
Nitrogen Dioxide: 3.44 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 78.24 μg/m3

Astronomical

Sunrise: 6:11 AM
Sun Transit: 12:56 AM
Sunset: 7:44 PM
Daylight: 13 hrs 33 mins
Moonrise: 6:26 AM
Moon Transit: 2:01 PM
Moonset: 9:52 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

1:07 AM - 3:37 AM
1:31 PM - 4:01 PM

Minor Periods

9:22 PM - 10:52 PM
5:56 AM - 7:26 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Partly Cloudy
46.8°F
29.5°F
37.6°F
58%
0 in
0%
0%
15.2 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 3.43 μg/m3
PM10: 3.94 μg/m3
Carbon Monoxide: 157.75 μg/m3
Nitrogen Dioxide: 3.17 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 87.04 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 12:56 AM
Sunset: 7:45 PM
Daylight: 13 hrs 36 mins
Moonrise: 7:03 AM
Moon Transit: 3:02 PM
Moonset: 11:14 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

2:06 AM - 4:36 AM
2:32 PM - 5:02 PM

Minor Periods

12:00 AM - 12:00 AM
6:33 AM - 8:03 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Sunny
56.5°F
29.8°F
43.9°F
60%
0 in
0%
0%
13.9 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 5.81 μg/m3
PM10: 6.74 μg/m3
Carbon Monoxide: 191.7 μg/m3
Nitrogen Dioxide: 7.77 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 68.69 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 12:56 AM
Sunset: 7:46 PM
Daylight: 13 hrs 39 mins
Moonrise: 7:50 AM
Moon Transit: 4:06 PM
Moonset: 12:14 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

3:09 AM - 5:39 AM
3:36 PM - 6:06 PM

Minor Periods

7:20 AM - 8:50 AM
12:00 AM - 12:00 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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