Loads of great advice, throwing my penny of thoughts into the mix, it is Scotland wait 10 minutes the weather will change, wait another 10 minutes changeable again.........so at least out of 1 hour, changeable weather.
That is on the West Coast of Scotland, over on the East Coast, less than 100 miles away, we could be basking in glorious sunshine all day, while the West is getting gales, storm force horizontal rain storms, Or if lucky, some of the freshest days anywhere on the planet.
Just point your bike away from dark cloudy skies, or ride around them, like I do, camp where it's dry that day, and move on if the rain blight-en's the rest of your day there.
It's an adventure for sure! Well worth it!
I am heading West in the next few days, this time by car. Camping only, no plans, no bookings, doubt I will use any ferries, buy local produce and petrol, relax enjoy the local culture, a slower pace of life, and the friendliest smiles anywhere that can be had.