Tirupati is crowded throughout the year; however, the best time to visit Tirupati is from September to February when the climate is relatively balmy with intermittent showers. The summers with its sweltering weather and humidity make Tirupati less ideal to visit.
Winter months are ideal for sightseeing and also visiting the shrine, and the weather is pleasant. The town gets crowded by September which is the onset of Brahmotsavam, one of the auspicious festival of Tirupati. For temple hopping, the best season is again winter owing to festivals like Navratri and Dussehra falling in October. Avoid visiting Tirupati during April and May as the temperature is torrid and unbearable.