what does the temp need to be to paint outside
1 Try to do your exterior painting on days when the temperature is between 60Â° and 85Â°F. (l5.56Â°C and 29.4Â°C) with low or moderate humidity and little or no wind.inyl siding is one of the best exterior surfaces to paint. ..and one of the easiest. All you need to do is to clean the siding thoroughly and remove any mildew with a bleach solution, then rinse the surface clean. Be sure that you don't skimp on the quality of paint you use when painting vinyl siding.