September Weather in Manteca, United States

Last updated: June 24, 2025

In September, the average temperature in Manteca, United States is a pleasant 23°C (74°F). Temperatures can range from a cool 10°C (50°F) to a scorching 41°C (107°F). Expect minimal rainfall, with only 2 mm (0.1 in) of precipitation spread across 0 days. Overall, the climate boasts an average humidity of 55%, making it an ideal time to explore the region!

September Temperature in Manteca

In September in Manteca, the average temperature is 23°C (74°F). The maximum can reach 41°C (107°F), while the minimum can drop to as low as 10°C (50°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Manteca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Manteca, September typically has an average temperature of 23°C (74°F), with highs reaching up to 41°C (107°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Manteca

In Manteca in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Manteca

The chart displays monthly precipitation patterns in Manteca, 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 Manteca, September typically receives around 2 mm (0.1 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 Manteca

In Manteca in September humidity is 55%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, creating a comfortable atmosphere for exploring the sights and indulging in outdoor activities.

September Average Humidity in Manteca

This chart illustrates the average monthly humidity levels in Manteca, 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 Manteca 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 Manteca

In Manteca 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 Manteca.

Maximum UV Index Levels in Manteca for September

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

Data source: Manteca 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 Manteca Compares to Other Months

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

This table compares monthly weather conditions in Manteca, 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)	92 mm (3.6 inches)	82%	moderate
February Weather	11°C (53°F)	73 mm (2.9 inches)	84%	moderate
March Weather	13°C (56°F)	75 mm (3.0 inches)	82%	very high
April Weather	17°C (63°F)	34 mm (1.3 inches)	78%	very high
May Weather	20°C (69°F)	16 mm (0.6 inches)	71%	very high
June Weather	25°C (76°F)	1 mm (0.1 inches)	64%	extreme
July Weather	26°C (79°F)	0 mm (0.0 inches)	58%	extreme
August Weather	25°C (78°F)	0 mm (0.0 inches)	54%	very high
September Weather	23°C (74°F)	2 mm (0.1 inches)	55%	very high
October Weather	18°C (65°F)	21 mm (0.8 inches)	62%	high
November Weather	13°C (56°F)	33 mm (1.3 inches)	78%	moderate
December Weather	10°C (50°F)	78 mm (3.1 inches)	80%	moderate