Non-"breathable" truly waterproof gloves will protect your hands from rain but soak your hands in your own sweat anyways.

"breathable" waterproof gloves will keep your hands dry when it's raining and cold but will get overwhelmed with your own sweat when it's warm.
I've used an expensive goretex pair of gloves around 45 degrees in a pouring rain and they worked very well.
My experience was that if you're cycling at max intensity "breathable" materials get overwhelmed around 60f. If you sweat more than I do it would be sooner. You can extend their range by cycling less intensely. I could probably wear a rain jacket at 75 degrees cycling at 8mph.

Of course when it's warmer there's also less need to keep your hands from getting wet. 85 degrees is fine.