American Canyon (CA) Temperature by Month

American Canyon, California, United States of America has an average annual maximum temperature of 21°C (70°F), ranging from 14°C (57°F) in December to 28°C (82°F) in September. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

Visitors to American Canyon can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 11°C (52°F) in September to 3°C (37°F) in December.

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

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. September, the warmest month, sees 270 hours of sunshine.

The chart below shows the average temperature throughout the year:

American Canyon'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:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

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 American Canyon, December is the coolest month, with average highs of 14°C (57°F) and humidity around 78%, considered high. In September, the warmest month, temperatures average 28°C (82°F) with 73% 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.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

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