I usually check the following websites: Pt Stanley weather buoy, CTV local, windfinder, environment canada, the weather network, windy.com and wunderground for Malahide/Copenhagen (which is usually very accurate up to 3 days out, but like all weather predictions, any more than 3 days, you're mostly guessing and hoping you're right unless we're talking hurricanes, and winter storms, they seem to always get those forecasts mostly right.) and then I trust what my eyes tell me when I look out the window to see what the top of the trees are doing.
I know yesterday and today the winds were supposed to be 30km/hr gusting to 50km/hr out of the SW. I don't think they got there yesterday, nor do I think they're going to get there today but that forecast and what I saw the top of the trees doing was enough to keep me home both yesterday and today. BUT......what it's doing here at home in London, and what it's doing when I get to the lake are almost always completely different.
As an example, I've left home with a slight NW wind blowing as predicted by all weather sites and local news I check, and my eyes said go fishing. So I go. When I get to the top of the hill heading into Pt Bruce, stronger winds, from the NE, different than forecast or what was happening at home, and when I get down the hill to the lake and park at the pier, I ask why I even bothered, because even though it's forecast light out of the NW, and it was NE at the top of the hill above PT Bruce, and I have never understood this, it's blowing strong out of the S, SW or SE and unfishable, but......... it was a nice drive.
My general rule of thumb for sitting on the pier, especially this year with the water being so high, is when I check all those sites, if they say that within an hour or two it will be or it already is blowing better than 15km/hr out of any southerly direction, and when I look at the tree tops out the window if they're not just swaying but somewhat bending, I'll save my gas and go another day that looks more favorable which is why I stayed home yesterday and today, and will go either Thursday or Friday, maybe both when the forecast is more favorable, providing they get it right, which is generally rare in the summer, but almost always dead on accurate in winter.