Paint manufacturers have exterior paint lines for low-temperature applications. Read the manufacturer instructions.
Example:

Sherwin-Williams Duration Exterior can be applied in temps at 35 degrees but the night temps needed for drying and curing may go below 35.

Before we apply paint onto any type of surface it should be cleaned, when it comes to exterior painting we recommend services such as power washing fuquay before we start to paint. After a deep cleaning, we wait at least 24 hours for the walls to dry. If we don’t wait a sufficient amount of time, moisture may be trapped behind the final layer of paint. We start painting outside when the night temps are above 40 and the day temps are above 50, but morning dew on the surfaces delays start work times, especially on sides of buildings with no morning sun.

Questions? mark@applepaintingrestoration.com