How will the weather be 3rd week of August and will it be very busy then.
Probably hot. Chance of showers. For detailed forecasts, check AccuWeather.com
Crowds seem to taper off in late August, but by no means a ghost town. Popular restaurants will still fill up at dinner time.Edited: 9:56 pm, July 30, 2018
I can only echo what exterior corridors said. Typically 90-ish, muggy and random showers/thunderstorms possible. School systems start back up around that time so you'll catch a slight break on the crowds but it will still be pretty lively.
Crowds diminish a little after he middle of August. Great beach weather, hot and very warm ocean water.