I do it all the time on my Memphis - all of the electronics are well protected from the elements. Make sure you're plugged into a GFCI outlet. Of course, your grill could be different so you might want to check with the mfg.
wow I hope pellet grills aren't just fair weather machines. I designed the electronics on my fridge smoker (220V) to take the rains in the Northwest. We should have 1/2 of rain on Monday when I smoke about 22 pound of pork cushions.
I have seen several posts of guys cooking in the rain with a pellet grill. I would too. just make sure you electrical connections are dry. My rec tec has all the boards and connectors covered. I am definitely smokin Thursday and the forecast calls for snow/rain.
I’d invest in one of those pop up tents. I have a 10x10 and thing pays for it self pretty quick if you’re like me and use it when working on anything outside during the summer sun or grilling with pellet grill