American Canyon (CA) Weather & Climate: Best Time to Visit

The climate in American Canyon is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in September to a moderate 14°C (57°F) in the coolest month, December.

Nights vary from 13°C (55°F) in September to around 3°C (37°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

American Canyon maintains relatively dry conditions year-round, recording average annual precipitation of 498 mm (20 in). The climate in American Canyon shows significant variation throughout the year. Expect high rainfall in December, the wettest month, with an average of 101 mm (4 in) of precipitation over 12 rainy days.

In contrast, the driest month August offers drier and sunnier days, with around 0.1 mm (0 in) of rainfall over 0 rainy days. For more details, please visit our American Canyon Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, American Canyon serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 10.8 hours of sunshine daily, and embrace the darker days in December, offering only 5.3 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in American Canyon.

The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year