These are the sites I use:
https://www.wunderground.com/weather/pws:IONCOPEN2 I go to this one to get somewhat of an idea and see the weather map it gives, then I click on the 10 day and it gives temps, wind speed and direction, and a bunch of other things, THEN I go
https://www.ndbc.noaa.gov/station_page.php?station=45132 here and check what the weather buoy south of Pt Stanley says, THEN I go
https://www.theweathernetwork.com/ca/alerts/high-alert/ontario/london here and type in Pt Bruce and see what it says, THEN I go
https://www.windy.com/42.653/-81.008?41.725,-81.008,7,m:eQgadT8 here and see what it says, THEN I go
https://weather.gc.ca/city/pages/on-137_metric_e.html here to see the weather radar and check for watches and warnings again, THEN
I look out the window to see what the trees are doing and then I decide if I'll go fishin or not.