Lawn turning brown after rain
So I'm in the Catskills, and we've had a few blessed days of sun until today, when we had rain. So the rain stopped and I noticed that the grass is yellowing in spots. See photos below.
Except for mowing the lawn (minimally, as recommended on this board) I haven't done anything for the past few week. No fertilizing, no application of weed killer (though I need it as you can see) and no watering, as we've had a ton of rain recently.
So I'm wondering what's causing this and what, if anything, I need to do.
Below are views of three different sections of the lawn: