They will fluff up much faster than you think, as long as the coats are dry and not caked in mud
Last night was HORRIBLE. In hindsight I should have brought them in. It wasn’t so much the amount of rain - 2". It was the huge winds with hard rain for several hours. 2 of the 3 were shivering cold when I brought them in when I got up, in the sideways snow. 1 of the 2 was dry under his blanket, my mare had a small damp spot where the waterproofing is apparently not good, but otherwise dry. Gelding #2 was fine (and I’ve actually never seen him shiver) despite being 32 now, and he too was dry. I should have either put sheets on top of blankets for 1 and 2, or just kept them all in. Oh well.
It was 62 went we went to bed, 33 and sideways snow when I got up. A local-ish weather station in Carthage NC, which is farther East from me, recorded a temp drop from 62 to 47.5, just between 6:15 and 6:30 am this morning
Mine stayed in until a couple hours ago, when the snow stopped and actually started melting when the sun came out. It’s supposed to be 21 here which mean our personal microclimate will likely be 18/19, and they will be totally fine in that cold, even as they weren’t fine in cold windy rain.