The best time to book a vacation rental in Riverhead is during the bustling summer months from June to August. This peak season draws families and beach enthusiasts eager to soak up the sun at the nearby beaches and explore the vibrant local attractions. July, in particular, stands out as the most popular month, with warm temperatures averaging in the mid-70s to low 80s Fahrenheit, great for outdoor activities and enjoying the lively option.During this time, visitors can indulge in a variety of experiences, from wine tasting at the nearby vineyards to enjoying water sports on the Peconic River. The area also hosts numerous summer festivals and events, ensuring there's always something exciting happening nearby.For those who prefer a quieter experience while still enjoying the beauty of Riverhead, consider planning your visit in December. This month offers a unique charm with holiday festivities and beautiful winter scenery, all at a more budget-friendly rate. It's cooler, with temperatures ranging from the low 30s to mid-40s Fahrenheit, you can still explore the local shops and enjoy cozy dining options.Ultimately, your choice depends on whether you crave the lively summer atmosphere filled with activities or the serene winter setting great for relaxed exploration.