OK, I went for my 3 miles. I wore my most water-resistant jacket, a baseball hat and shorts. At first it wasn't bad because the rain was light, but it rained harder the farther I went. About mile 2 I went to scratch my forehead and realized there was a puddle in my right sleeve that poured into my armpit! I have never had a puddle in a sleeve before.
Well, I kept going and now, after a nice hot shower, I am glad I went. (Well, it was only 3 miles after all and it is rain in August.)