I use neoprene gloves (3mm diving gloves from lomo, c£12) whenever it's heavy rain. I'm good in them down to low temps (1-5c) but I don't have raynauds so ymmv. they trap the water/sweat in though, so your gloves STINK and you're not supposed to wash them (iirc) nor dry them on a radiator, otherwise you'll break down whatever it is inside them that makes them work. I'd rather have smelly hands than cold hands though
the lomo ones are diving specific so their grip is sub-optimal but it's manageable. you can pay more for cycling-specific (castelli e.g.) ones with better grips
I use neoprene gloves (3mm diving gloves from lomo, c£12) whenever it's heavy rain. I'm good in them down to low temps (1-5c) but I don't have raynauds so ymmv. they trap the water/sweat in though, so your gloves STINK and you're not supposed to wash them (iirc) nor dry them on a radiator, otherwise you'll break down whatever it is inside them that makes them work. I'd rather have smelly hands than cold hands though
the lomo ones are diving specific so their grip is sub-optimal but it's manageable. you can pay more for cycling-specific (castelli e.g.) ones with better grips