Sunnyside Weather Forecast

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Last Updated: December 12, 2025

Sunnyside is a vibrant city located in Yakima County, Washington.


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Summary

It enjoys a semi-arid climate, characterized by hot summers and mild winters. Summers are typically dry with temperatures averaging around 90°F, while winters are cool and wet with temperatures ranging between 30°F and 50°F. The area experiences approximately 9 inches of rainfall annually, mainly occurring during the winter months.

Sunnyside is blessed with abundant hydrology constituents due to its close proximity to the Yakima River. The river serves as a valuable water source for irrigation, supporting the region's thriving agricultural industry. Additionally, the nearby Yakima Valley boasts several beautiful lakes and reservoirs, offering opportunities for boating, fishing, and water sports.

Outdoor enthusiasts in Sunnyside have access to a variety of recreational activities. The scenic surroundings provide ample opportunities for hiking, camping, and birdwatching. The nearby Rattlesnake Hills and Yakima Valley also offer opportunities for wine tasting, as the region is known for its vineyards and wineries. Sunnyside truly offers a diverse range of outdoor experiences, making it an appealing destination for nature lovers and adventure seekers.

       

Weather Forecast

Sunnyside receives approximately 198mm of rain per year, with humidity levels near 84% and air temperatures averaging around 11°C. Sunnyside has a plant hardyness factor of 7, meaning plants and agriculture in this region tend to thrive during the non-winter months.