To paraphrase The Carpenters, "Rainy Days and Hot Days" may very well get your paint job down. I do a lot of brush painting and I've had paint do funny things on rainy days in the past, so needless to say, I won't paint (brush or spray can) on rainy days. (I don't have an airbrush, but if I did, I wouldn't use it when it rains.)
The same with hot days. If the inside of my apartment gets above 88 to 90 degrees, I won't paint. It dries too fast and I wind up with brush marks. When I spray paint, I take everything outside, but I wouldn't spray paint (or airbrush) during really hot weather.