September Weather in Emeryville, United States

Last updated: June 24, 2025

In Emeryville, United States, the average temperature in September is a pleasant 19°C (66°F), with a minimum dipping to 8°C (48°F) and a maximum reaching up to 40°C (104°F). Expect minimal precipitation, with just 1 mm (0.0 in) falling over 0 days, and enjoy an average humidity of 55%.

September Temperature in Emeryville

In September in Emeryville, the average temperature is 19°C (66°F), with maximums reaching 40°C (104°F) and minimums dropping as low as 8°C (48°F). Be prepared for a wide range of temperatures when traveling during this time.

September Weather in Emeryville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Emeryville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Emeryville, September typically has an average temperature of 19°C (66°F), with highs reaching up to 40°C (104°F) and lows dropping to around 8°C (48°F).

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

September Precipitation in Emeryville

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

September Precipitation Trends in Emeryville

The chart displays monthly precipitation patterns in Emeryville, 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 Emeryville, 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 Emeryville

In Emeryville in September humidity is 55%. With an average temperature of 19°C (66°F), this humidity feels like a gentle warmth wrapping around you, making it comfortable for traveling while allowing you to enjoy the sights without feeling overheated or sweaty.

September Average Humidity in Emeryville

This chart illustrates the average monthly humidity levels in Emeryville, 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 Emeryville is approximately 55%, 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 Emeryville

In Emeryville 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 Emeryville.

Maximum UV Index Levels in Emeryville for September

The chart shows the monthly maximum UV Index (UVI) for Emeryville 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 Emeryville typically reaches 9, which falls under the very high exposure category.

Data source: Emeryville 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 Emeryville Compares to Other Months

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

This table compares monthly weather conditions in Emeryville, 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 (51°F)	94 mm (3.7 inches)	82%	moderate
February Weather	11°C (53°F)	91 mm (3.6 inches)	84%	moderate
March Weather	12°C (54°F)	73 mm (2.9 inches)	82%	very high
April Weather	14°C (58°F)	29 mm (1.2 inches)	78%	very high
May Weather	15°C (60°F)	18 mm (0.7 inches)	71%	very high
June Weather	18°C (64°F)	2 mm (0.1 inches)	64%	extreme
July Weather	18°C (64°F)	0 mm (0.0 inches)	58%	extreme
August Weather	18°C (65°F)	0 mm (0.0 inches)	54%	very high
September Weather	19°C (66°F)	1 mm (0.0 inches)	55%	very high
October Weather	17°C (63°F)	24 mm (1.0 inches)	62%	high
November Weather	13°C (56°F)	42 mm (1.7 inches)	78%	moderate
December Weather	10°C (51°F)	80 mm (3.2 inches)	80%	moderate