Alta-Loma Weather Forecast

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Last Updated: December 7, 2025

Alta Loma is a small community located in the foothills of the San Gabriel Mountains in Southern California.


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Summary

The climate is classified as Mediterranean, with hot and dry summers and mild, wet winters. The area is known for its high levels of hydrology constituents, primarily due to run-off from the nearby mountains. Outdoor recreation opportunities in Alta Loma include hiking, mountain biking, and horseback riding in the nearby parks and trails. The area is also home to several golf courses and is a popular destination for birdwatching. Overall, Alta Loma offers a unique mix of outdoor activities and natural beauty, making it a popular destination for visitors and residents alike.

       

Weather Forecast

Alta-Loma receives approximately 635mm of rain per year, with humidity levels near 72% and air temperatures averaging around 18°C. Alta-Loma has a plant hardyness factor of 9, meaning plants and agriculture in this region tend to thrive here all year round.