Don't bring them in wet, they won't dry. If you have a breeze they will soon dry off, you'll be surprised. Your shearer will tell you if he thinks it's not suitable shearing weather. As long as the shearer is happy then all will be fine. If the fleeces are still a bit damp once off you can always just spread them out on a sunny day to finish drying off (assuming you don't have many sheep!).
If you aren't sure, just give your shearer a ring say on the monday afternoon to confirm - the forecast may have changed by then anyway. Or .... just ring him today, and if he tells you to bring them in then do so, but I doubt he will (and that's a lot of feeding for four/five days, and your sheep won't be impressed!).