September Weather in Lompoc, United States

Last updated: June 24, 2025

In September, the average temperature in Lompoc, United States hovers around 17°C (63°F). You can expect a minimum of 11°C (53°F) and a maximum of 29°C (85°F). With a mere 1 mm (0.1 in) of precipitation over 0 days, you'll find the weather quite pleasant, complemented by an average humidity of 70%.

September Temperature in Lompoc

In September in Lompoc, the average temperature is 17°C (63°F). Maximums can reach 29°C (85°F), and minimums can drop to as low as 11°C (53°F). This mild climate makes Lompoc an ideal destination for travelers looking to enjoy outdoor activities without the extreme heat.

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

The chart illustrates September temperature patterns in Lompoc, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lompoc, September typically has an average temperature of 17°C (63°F), with highs reaching up to 29°C (85°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Lompoc

In Lompoc in September, the precipitation amount is 1 mm (0.1 in) during 0 days, indicating a very dry period.

September Precipitation Trends in Lompoc

The chart displays monthly precipitation patterns in Lompoc, 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 Lompoc, September typically receives around 1 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 Lompoc

In Lompoc in September humidity is 70%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel both refreshing and slightly sticky, as you navigate the air thick with moisture.

September Average Humidity in Lompoc

This chart illustrates the average monthly humidity levels in Lompoc, 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 Lompoc is approximately 70%, 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 Lompoc

In Lompoc 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 Lompoc.

Maximum UV Index Levels in Lompoc for September

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

Data source: Lompoc 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 Lompoc Compares to Other Months

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

This table compares monthly weather conditions in Lompoc, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	92 mm (3.6 inches)	80%	moderate
February Weather	12°C (54°F)	72 mm (2.8 inches)	83%	high
March Weather	13°C (55°F)	82 mm (3.2 inches)	80%	very high
April Weather	13°C (56°F)	21 mm (0.8 inches)	76%	very high
May Weather	14°C (57°F)	10 mm (0.4 inches)	75%	extreme
June Weather	15°C (60°F)	1 mm (0.1 inches)	74%	extreme
July Weather	16°C (62°F)	1 mm (0.0 inches)	75%	extreme
August Weather	17°C (63°F)	1 mm (0.1 inches)	72%	extreme
September Weather	17°C (63°F)	1 mm (0.1 inches)	70%	very high
October Weather	17°C (63°F)	10 mm (0.4 inches)	70%	high
November Weather	15°C (59°F)	28 mm (1.1 inches)	74%	moderate
December Weather	13°C (56°F)	70 mm (2.7 inches)	76%	moderate