The ideal temperature range for painting outside depends on the type of paint being used. As a general rule of thumb, water-based exterior paint, also known as latex paint, should be applied when the temperature is between 50°F and 85°F (10°C to 29°C), with an ideal range of 60°F to 85°F (15°C to 29°C) . Oil-based paint can be applied when the temperature is between 40°F and 90°F (4°C to 32°C), with an ideal range of 50°F to 90°F (10°C to 32°C) . It is important to note that the temperature should not drop below 32°F (0°C) at night for several days after painting with water-based paint, and should not drop below 40°F (4°C) for oil-based paint. If the temperature is too low, the paint may not cure properly, leading to cracking, peeling, or discoloration. Similarly, if the temperature is too high, the paint may dry too quickly, making it difficult to apply and leading to an uneven finish. It is also important to consider humidity levels, which should be between 40% and 70% for optimal drying and curing.