Annandale Weather Forecast

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Last Updated: December 29, 2025

Annandale, New-Jersey has a continental climate characterized by hot summers and cold winters.


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Summary

The average temperature in Annandale is around 52°F, with an average precipitation of 49 inches per year. The town's hydrology constituents include the Raritan River and its tributaries, which are popular spots for fishing, canoeing, and kayaking. Outdoor recreation opportunities in Annandale include biking, hiking, and camping at the Round Valley Recreation Area, which boasts over 1,000 acres of land and a reservoir for boating and fishing. The town is also home to the Voorhees State Park, which offers several activities such as bird watching, picnicking, and cross country skiing during the winter months.

       

Weather Forecast

Annandale receives approximately 1284mm of rain per year, with humidity levels near 79% and air temperatures averaging around 11°C. Annandale has a plant hardyness factor of 6, meaning plants and agriculture in this region thrive during a short period during spring and early summer. Most plants will die off during the colder winter months.