I just checked the forecast. Rain chances have decreased, but it's going to be cool during the evenings. What's up with all these stupid cold fronts that keep pushing through here?
Anyway, for you guys with open cars, get some biker leathers. I've been riding motorcycles for years and there is nothing that keeps the cold out like leather. I've tried down filled quilted nylon, waterproof vinyl with fleece, poplin with wool, etc, etc. Nothing works like leather. I have a leather jacket with a zip-out 3-M Thinsulate lining. It has zippered vents in the front, back, and sleeves, snap-shut collar. It works so well I ususally have to leave it partially open. If there's a biker shop nearby, go check it out. They also have face covers made from wet-suit material that will keep your cheeks nice & warm.
After that, go to Walmart and get a cheap rainsuit that will fit over your leathers. Then you're ready for whatever Mother Nature dumps on us.