The best time to go to Glendale, New South Wales, is during autumn (March to May) and spring (September to November) for pleasant weather and fewer crowds.
Autumn offers mild temperatures, usually ranging from 15°C to 25°C, making it ideal for exploring the outdoors and local attractions without the intense summer heat. The surrounding natural areas, like Lake Macquarie, are particularly enjoyable during this season.
Spring also provides comfortable temperatures, typically between 18°C and 28°C, and the landscape is lush and green. This period is excellent for outdoor activities and visiting the Hunter Valley wineries, which are a short drive away, before the peak summer season begins.
Summer (December to February) can be quite hot, often exceeding 30°C, and is the busiest tourist season, especially around school holidays. While it's great for beach activities, it might be less comfortable for those who prefer cooler weather for sightseeing.