Got really thoroughly soaked on the way home yesterday. Once I was completely drenched I couldn't get any wetter, so I just kept pedaling. At least it wasn't hot! Just ordered a rain cover for the pannier/backpack (Arkel Ladybug).
I was headed to have dinner with some friends and had spent some time looking at Google Maps for the best route across I-20. Found one that is pretty bike friendly, and really glad I didn't try to take the one I knew would be terrible. Ate dinner dripping wet on the patio, oh well.