Do I need to protect my leather saddle from the sun? Most questions about leather saddles seem to be about keeping them dry, but what about too dry?
I just bought a new bike with a Brooks B-17. I've applied proofide and I will be getting a cover to protect it from the rain (it's stored outside unfortunately). However, currently it's extremely hot and sunny where I live. Should I be getting a cover more urgently to protect the saddle from hot sun?
I'd think a white opaque plastic bag over saddle would do fine.  The leather has to breathe - if you wrap it tightly then it might grow mould.
You might have to treat your saddle leather a little more frequently if it lives in the sun/heat a lot.
Ideally, store your bike inside, a garage, or at least under some rain protection.  A balcony/porch/etc is better than out in the weather.   A wall-hook or lift might let you utilise unusable space.