September Weather in American Canyon, United States

Last updated: June 24, 2025

In American Canyon, United States, the average temperature in September hovers around 21°C (70°F), offering a pleasantly warm atmosphere. Temperatures can range widely, with a minimum of 8°C (46°F) and a scorching maximum of 44°C (111°F). Overall, expect minimal rainfall, with only 1 mm (0.0 in) recorded over 0 days, and enjoy a comfortable average humidity of 44%.

September Temperature in American Canyon

In September in American Canyon, the average temperature is 21°C (70°F). Maximum temperatures can reach as high as 44°C (111°F), while minimums can drop down to a chilly 8°C (46°F). It's advisable to pack both light clothing for the heat and warmer layers for cooler evenings when traveling.

September Weather in American Canyon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in American Canyon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In American Canyon, September typically has an average temperature of 21°C (70°F), with highs reaching up to 44°C (111°F) and lows dropping to around 8°C (46°F).

Data source: Temperature data for American Canyon generated using information from the Copernicus Climate Change Service.

September Precipitation in American Canyon

In American Canyon in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in American Canyon

The chart displays monthly precipitation patterns in American Canyon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In American Canyon, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in American Canyon

In American Canyon in September, humidity is 44%. With an average temperature of 21°C (70°F), this humidity feels like a refreshing embrace, making it a comfortable environment for exploring and enjoying outdoor activities without feeling overheated.

September Average Humidity in American Canyon

This chart illustrates the average monthly humidity levels in American Canyon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in American Canyon is approximately 44%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in American Canyon

In American Canyon in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in American Canyon.

Maximum UV Index Levels in American Canyon for September

The chart shows the monthly maximum UV Index (UVI) for American Canyon in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in American Canyon typically reaches 9, which falls under the very high exposure category.

Data source: American Canyon September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in American Canyon Compares to Other Months

Weather in American Canyon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in American Canyon, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in American Canyon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	119 mm (4.7 inches)	84%	moderate
February Weather	11°C (53°F)	113 mm (4.5 inches)	84%	moderate
March Weather	12°C (55°F)	81 mm (3.2 inches)	83%	high
April Weather	15°C (60°F)	33 mm (1.3 inches)	81%	very high
May Weather	18°C (64°F)	19 mm (0.8 inches)	74%	very high
June Weather	21°C (70°F)	2 mm (0.1 inches)	64%	extreme
July Weather	21°C (70°F)	0 mm (0.0 inches)	44%	extreme
August Weather	21°C (71°F)	0 mm (0.0 inches)	36%	very high
September Weather	21°C (70°F)	1 mm (0.0 inches)	44%	very high
October Weather	18°C (65°F)	29 mm (1.1 inches)	65%	high
November Weather	13°C (56°F)	43 mm (1.7 inches)	84%	moderate
December Weather	10°C (50°F)	91 mm (3.6 inches)	83%	moderate