Foothill Ranch (CA) Temperature by Month

Foothill Ranch in California, United States of America sees significant seasonal temperature differences, with daytime highs between 19°C (66°F) in December and 32°C (90°F) in August, averaging 25°C (77°F) annually. Explore the full monthly breakdown below.

The climate in Foothill Ranch is dynamic, ranging widely from pleasant in winter to very warm in summer. Nights are significantly colder, with lows dropping from 17°C (63°F) in August to 9°C (48°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Foothill Ranch by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. August, the warmest month of the year, receives 351 hours of sunshine.

The chart below shows the average temperature throughout the year:

Foothill Ranch's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Foothill Ranch this rarely lasts long on the ground.

For more on Foothill Ranch's weather, including monthly rainfall, sunshine hours, and humidity, visit our Foothill Ranch climate page.