Even if it's hot during the day, the paint won't form a good film if temperatures drop too low at night. In general, it is not recommended to apply paint when the temperature is below 50 degrees. However, as paint quality improves, the minimum requirements increase. Before, it was recommended never to paint a house at temperatures below 50°F.
However, modern paint formulations now allow painting at temperatures as low as 35°F. It should generally be at least 50 degrees when applying the paint and the temperature should not drop below 32 degrees at night for several days. This is because the paint needs many days to cure and, since the temperature drops, it can cause dew to form on surfaces. As a result, the water in the paint starts to evaporate too slowly.
Even if you have a hot day, the paint won't have adequate time to create a good film if the temperature drops too low at night. Often, Toronto's Home In Painters will suggest a low-temperature paint additive to normalize the product. Before applying paint to the outside of your house, when it's 38 degrees outside, you should check the label on the paint can for instructions on temperature ranges. If you're not sure if there's moisture outside, check the surface you're going to paint carefully.
If it feels damp, even in the slightest, don't paint. Unfortunately, temperature isn't the only weather factor you should consider when choosing to paint your house. For interior and exterior painting projects, it's important to know the temperature range in which you can successfully paint (or dye) your house, shed, or other exterior projects. Since some paints need at least a day or several days to fully dry, always check the weather after the day you paint to ensure that the temperature doesn't change too dramatically while the paint or stain dries.
Water-based latex paint needs enough time for the water to naturally evaporate and the paint to cure. If you plan to paint the exterior of your home, the type of paint (along with humidity and temperature) will determine the success of drying the paint. If that's the case, make sure you finish all the exterior paint before the intense cold hits and it's already too late. The last thing you want to do is repaint your house because the conditions hurt you and the paint peels off prematurely because it didn't have time to heal.
Often, the incredibly hot summer months in Arizona can cause exterior paint to blister and bubble. Obviously, early summer and autumn tend to have the most ideal weather conditions and temperatures for outdoor painting.