San Simeon (CA) Temperature by Month

The average annual maximum temperature in San Simeon, California, United States of America is 19°C (66°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how San Simeon compares to cities worldwide.

The temperature in San Simeon remains steady throughout the year, providing a consistently pleasant climate. Maximum daytime temperatures range from a pleasant 22°C (72°F) in September to a moderate 15°C (59°F) in December. Nights are mild year-round, with lows ranging from 13°C (55°F) in September to 8°C (46°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in San Simeon 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. September, the warmest month of the year, receives 270 hours of sunshine.

The chart below shows the average temperature throughout the year:

San Simeon's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

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