I find there's nothing better to stir up imagination than a trip to a different location, a holiday; maybe a visit to friends in a part of the country you've never seen before or a specifically made plan to go somewhere new to you ...
100 degrees - hot enough yet ? It was, and it wasn't the scenery that propelled me into writing a short story but remembering a college friend who was writing a novel about the Mojave Desert [just around the back of that medium sized boulder].
I couldn't understand her connection to the Mojave - until I visited it recently - It's high-coloured bleakness was thought provoking in itself - and somehow gave me idea after idea for stories. I considered writing about my friend - what she was trying to achieve [I'm not sure whether she'd actually visited the desert] and the difficulties she came across. Of course I'd have to check with her before I put pen to paper or finger to keyboard.
So, go somewhere new - even if it's only a bus ride away - and watch yourself itching to get back and start writing !