Rancho Santa Fe (CA) Temperature by Month

Rancho Santa Fe in California, United States of America sees moderate seasonal temperature shifts, with daytime highs between 18°C (64°F) in December and 26°C (79°F) in September, averaging 22°C (72°F) annually. Explore the full monthly breakdown below.

The climate in Rancho Santa Fe experiences moderate temperature changes, with mild shifts between seasons. At night, temperatures range from 17°C (63°F) in September to 7°C (45°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Rancho Santa Fe by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. September, the warmest month, gets 253 hours of sunshine.

The chart below shows the average temperature throughout the year:

Rancho Santa Fe's average annual maximum temperature is 22°C (72°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.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Rancho Santa Fe, December is the coolest month, with average highs of 18°C (64°F) and humidity around 64%, considered high. In September, the warmest month, temperatures average 26°C (79°F) with 74% humidity, conditions that feel high. For a full picture, see our humidity page.

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 Rancho Santa Fe this rarely lasts long on the ground.

For more on Rancho Santa Fe's weather, including monthly rainfall, sunshine hours, and humidity, visit our Rancho Santa Fe climate page.