Best Conditions for Sealing Asphalt Driveway
Pick a sunny day, with ABSOLUTELY no chance of rain that day. If it rains within a few hours of the sealing job, you won't be happy. 24 hours will be plenty of time for it to dry though.

The perfect day would be sunny, but not incredibly hot, as sealing a driveway would be miserable work on a blistering hot day. Remember, you will be standing on black pavement in the sun.

Start work in the morning, to give it time to dry in the sun. Keep anything off it for a day.