If the weather forecast for the day calls for dry conditions and warming temperatures, you can begin painting early in the morning and the paint will still have time to dry, assuming the relative humidity, temperature, and dew point are within the recommended range. Don't paint above 88 degrees F, 85% relative humidity, or when the temperature is less than 5 degrees F above the dew point. To be safe, don't paint latexes below 50 degrees F and oils below 40 degrees F unless you have a paint specially formulated for colder weather conditions. Painting too close to the dew point or at higher than recommended relative humidity can cause bonding problems. You may not notice the problem until the next time the house is washed to remove mildew, at which time the paint will debond in strips from the water pressure. Painting at too hot a temperature can cause blistering of the paint due to the high vapor pressure of resins escaping the paint film before it can properly dry.