September Weather in Barstow Heights, United States

Last updated: June 24, 2025

In Barstow Heights, United States, the average temperature in September hovers around 26°C (79°F), but temperatures can vary widely, dipping as low as 8°C (47°F) and soaring to a blistering 42°C (108°F). Expect minimal rainfall with an average precipitation of just 2 mm (0.1 in) over a single day, and enjoy relatively low humidity levels at around 41%.

September Temperature in Barstow Heights

In September in Barstow Heights, the average temperature is 26°C (79°F). Maximums can reach 42°C (108°F), while minimums can drop as low as 8°C (47°F). This wide range of temperatures makes it essential to pack versatile clothing for your travels.

September Weather in Barstow Heights: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Barstow Heights, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Barstow Heights, September typically has an average temperature of 26°C (79°F), with highs reaching up to 42°C (108°F) and lows dropping to around 8°C (47°F).

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

September Precipitation in Barstow Heights

In Barstow Heights in September, the precipitation amount is 2 mm (0.1 in) during one day.

September Precipitation Trends in Barstow Heights

The chart displays monthly precipitation patterns in Barstow Heights, 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 Barstow Heights, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 1 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 Barstow Heights

In Barstow Heights in September humidity is 41%. With an average temperature of 26°C (79°F), this humidity feels like a comfortable embrace, making it ideal for exploring the sights and enjoying outdoor activities without feeling overly sticky or overheated.

September Average Humidity in Barstow Heights

This chart illustrates the average monthly humidity levels in Barstow Heights, 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 Barstow Heights is approximately 41%, 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 Barstow Heights

In Barstow Heights in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Barstow Heights.

Maximum UV Index Levels in Barstow Heights for September

The chart shows the monthly maximum UV Index (UVI) for Barstow Heights 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 Barstow Heights typically reaches 10, which falls under the very high exposure category.

Data source: Barstow Heights 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 Barstow Heights Compares to Other Months

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

This table compares monthly weather conditions in Barstow Heights, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	21 mm (0.8 inches)	76%	moderate
February Weather	10°C (51°F)	18 mm (0.7 inches)	80%	high
March Weather	13°C (56°F)	18 mm (0.7 inches)	69%	very high
April Weather	18°C (64°F)	12 mm (0.5 inches)	57%	very high
May Weather	21°C (70°F)	4 mm (0.2 inches)	45%	extreme
June Weather	27°C (81°F)	1 mm (0.1 inches)	34%	extreme
July Weather	30°C (87°F)	6 mm (0.2 inches)	29%	extreme
August Weather	30°C (86°F)	5 mm (0.2 inches)	28%	extreme
September Weather	26°C (79°F)	2 mm (0.1 inches)	41%	very high
October Weather	19°C (66°F)	4 mm (0.2 inches)	54%	very high
November Weather	14°C (57°F)	7 mm (0.3 inches)	68%	moderate
December Weather	9°C (48°F)	23 mm (0.9 inches)	75%	moderate