Tackling an exterior paint job needs a great deal of planning and close study of weather conditions for an end result that will be both attractive and long lasting. The worst conditions are extreme heat and cold. The weather could be the deciding factor that can make or break the outcome of your exterior paint job. It goes without saying that it is vital to check the local weather forecast as part of your pre-painting preparation for an exterior paint session. The ideal conditions for such a venture are a day with mild temperatures, low humidity and little or no wind.