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The best time to go to Cowan is during the spring (September to November) and autumn (March to May) months, when the weather is most pleasant for outdoor activities.During spring, the bushland surrounding Cowan comes alive with wildflowers, making it an excellent time for bushwalking and enjoying the natural scenery. The temperatures are mild, typically ranging from 15°C to 25°C, which is ideal for exploring the walking tracks in Ku-ring-gai Chase National Park or enjoying a picnic by the Hawkesbury River.Autumn also offers comfortable temperatures, generally between 12°C and 22°C, and lower humidity. This season is great for more strenuous activities like mountain biking on the fire trails or kayaking on the tranquil waters. The clear skies and cooler air make for excellent photography conditions, capturing the rich colours of the landscape.While summer (December to February) can be hot, with temperatures often exceeding 30°C, it's still a good time for water-based activities such as swimming or boating.