Anyone have a recent reading?
Don’t even tell me you don’t have an update on this 
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Note: temps shown in centigrade. This image shows the Madison Area Lakes in the LTER study area. 
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Madison Lakes Region - Lake Characteristics
Characteristic Fish Lake Lake Mendota Lake Wingra Lake Monona Latitude N 43° 17 N 43° 06 N 43° 03 N 43° 03 Longitude W 89° 39 W 89° 24 W 89° 25 W 89° 22 Area (ha) 87.4 3937.7 139.6 1324 Mean Depth (m) 6.6 12.8 2.7 8.2 Maximum Depth (m) 18.9 25.3 6.7 22.5 Shoreline Length (km) 33.8 5.9 20.9 Landscape position high low high low Development on shoreline high high high high Duration of ice cover (days) 119 120 107 Water Temperature (°C) 23.9 24.3 23 25.2 pH 8.3 8.2 9.4 8.2 ANC (µeq/L) 2873 3714 3723 3500 Conductivity (µS/cm) 280 412 500 434 Total P (µg/l) 21.3 118 28.2 89.2 Total N (µg/l) 870 1080 945 1080 SiO2 (µg/l) 550 1100 660 Secchi Depth (m) 2.1 3.4 0.7 2.5 Chlorophyll (µg/l) 8.2 8.6 12 11.9 Number of fish species 25 42 28 39
Note:
water temperature (0 - 2m) and secchi from June 1 - August 31
pH, ANC and conductivity from the average of spring and fall mixis sampling
total P, total N and SiO2 from spring mixis sampling
chlorophyll (surface) from open water season
Try here: http://www.cityofmadison.com/beaches/
I think Olin is the closest to the swim course (maybe a local can correct me on that). Looks like most are in the low to mid 70’s.
Edit: at the top of the linked web page, there is an excel file download that shows the results of a water quality test (which appears to be fine). Temp as of Aug 30 at the terrace is listed at 79 Deg F.
I threw a toe in it this morning and it was not bad at all. Still wetsuit legal though.
It is 72* at Olin park(that is just down the shoreline). The temp dropped 10* from when we got all the rain. it is quite nice in a full suit. Some of the sites have not been updated since the water has come up 4’ in the last 2 weeks!
BB