I usually polish outdoors. If possible find some shade. If I am doing a full/multi step polish I will move the car around as the day progresses to maintain shade on my work area. I also mist some QD and wipe the surface before I begin. Most polishes work fine outside (no different than inside) but make sure the surface is cool. If I have to move the car I will take a break while the new work section cools.
Menzerna FP2 works fine for me outside, but IP dusts a lot more than indoors with the slightest hint of sun, I suggest mixing in some FTG or RMG on the pad.