I've been commuting to work on and off for a few years, but mostly off. Now, I've sold my car (my wife still has hers, in case of emergency need to sleep in) but, I'm commuting full time now. It's a short 3 mile commute, and I'm really enjoying riding everyday. I'm trying to gear up in mind and gear to ride in the rain. I live in SoCal, so that won't happen very often, but when it does rain, it tends to poor down buckets. I'm looking forward to learning from the experienced crowd here on the forums.
You may have to experiment a bit on your own regardless of
the number of recommendations you get here. Me for example
I wear the same thing between 100F-60F(rain or shine), a
hi-viz shirt and baggy/mountainbike shorts. But I see some
riders already with a jacket at 75F with rain. In heavy rain
the water will bother your eyes, better have a visor on your
helmet. If you don't wear a helmet, wear a baseball cap.