I agree with the no rain gear group, but obviously temperature dependent. OP seems to be talking about upcoming summer afternoon storms. I don't know what the temperature would be during an afternoon storm in Endicott.

And then it obviously depends on how you ride and how much body heat you are generating. If it is cool enough and you aren't working hard enough to break a sweat, you may try a light jacket. But even "breathable" jackets aren't really. So if you do work up some body heat, it will just be trapped and make you hotter and hotter.

The only other issue I've had is rain in the eyes. I have a visor on my helmet, which helps. And I usually wear sunglasses. But depending on how much rain is coming down, I have to turn up my wiper frequency (i.e., blink more often).