San Anselmo (CA) Temperature by Month
San Anselmo, California, United States of America has an average annual maximum temperature of 21°C (70°F), ranging from 13°C (55°F) in December to 27°C (81°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
San Anselmo Monthly Temperatures
The climate in San Anselmo is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 12°C (54°F) in July to 5°C (41°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in San Anselmo 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. July, the warmest month of the year, receives 313 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: San Anselmo vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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San Anselmo vs World: Temperature Compared
San Anselmo's average annual maximum temperature is 21°C (70°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
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.
What Does the Temperature Feel Like in San Anselmo?
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 San Anselmo, December is the coolest month, with average highs of 13°C (55°F) and humidity around 78% — considered high. In July, the warmest month, temperatures average 27°C (81°F) with 75% 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 San Anselmo this rarely lasts long on the ground.
For more on San Anselmo's weather — including monthly rainfall, sunshine hours, and humidity — visit our San Anselmo climate page.
