Good luck everyone - wrap up warm!
8° C in Perth when I was out at 8AM this morning - will be colder higher up, we're at sea-level. Met Office forecast for Amulree (in the hills halfway between Aberfeldy and Crieff) has the temperature in single digits all weekend, dropping as low as 2°, which coincides with heavy rain on Saturday evening. Hopefully it will have cleared well before the time you're all passing there, but that rain might well fall as snow on the tops of even the lower hills.
No snow visible on those hills from here today, but still quite a bit on the tops of the highest peaks visible from in town, up past Dunkeld toward Pitlochry / Aberfeldy. I'd be very surprised if there's no snow on the tops of the taller hills around the Comrie - Killin -Aberfeldy section (Ben Vorlich, Ben Chonzie, Ben Lawers, etc.).