It was the first time I "had" to run in the rain today, and I opted for a waterproof, but I got too hot.
I'm wondering if it's more comfortable to just suck it up and get wet - or do I just need a better jacket?
Both for me I find a proper waterproof gets sweaty very quickly so when its warm I don't bother at all, in the cold I'll stick on something like this Higher State ultralight smock or a cycling gilet which slows down the ingress of moisture enough that I'm at least warm and wet rather than cold and wet - and if I get too hot its small enough to stick in a shorts pocket or flip/spi belt.
I hate getting wet and cold so I wear a waterproof jacket but not much underneath - maybe just a t-shirt or a vest-top. But the most important thing is a baseball cap to keep the rain out my eyes because THAT is horrible.