Aguanga Post Office mail available at Temecula Post Office AGUANGA – The Aguanga Post Office located at 45600 Highway 79 in Aguanga is temporarily closed due to the Highland Fire. Services will resume as soon as the U.S. Postal Service determines that it is safe to do so. Customers normally served by the Aguanga Post Office should temporarily pick up their mail at the Temecula Post Office located at 30777 Rancho California Road in Temecula. Hours for pick up are 9 a.m. a.m. to 5 p.m. on weekdays and 10 a.m. to 3 p.m. on Saturdays. Customers must present a photo ID for mail pick-up. Many retail services including temporary forwards, stamps and more are also available anytime, online at USPS.com.