September Weather in Buellton, United States

Last updated: June 24, 2025

In Buellton, United States, the average temperature in September is a pleasant 18°C (64°F). Expect a minimum of 13°C (55°F) and a comfortable maximum of 28°C (82°F). With only 1 mm (0.1 in) of precipitation over the month, rain is rare, making it a great time to explore the area. Additionally, the average humidity sits at a moderate 70%, ensuring a refreshing atmosphere.

September Temperature in Buellton

In September in Buellton, the average temperature is 18°C (64°F). Maximums can reach 28°C (82°F), and minimums can be as low as 13°C (55°F). This pleasant climate makes it an ideal destination for travelers seeking comfortable weather and outdoor activities.

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

The chart illustrates September temperature patterns in Buellton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Buellton, September typically has an average temperature of 18°C (64°F), with highs reaching up to 28°C (82°F) and lows dropping to around 13°C (55°F).

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

September Precipitation in Buellton

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

September Precipitation Trends in Buellton

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

In Buellton in September humidity is 70%. With an average temperature of 18°C (64°F), this humidity feels like a sticky embrace, making outdoor excursions a bit more cumbersome and requiring frequent breaks to stay refreshed and hydrated.

September Average Humidity in Buellton

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

In Buellton 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 Buellton.

Maximum UV Index Levels in Buellton for September

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

Data source: Buellton 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 Buellton Compares to Other Months

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

This table compares monthly weather conditions in Buellton, 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 (56°F)	95 mm (3.8 inches)	80%	moderate
February Weather	13°C (55°F)	78 mm (3.1 inches)	83%	high
March Weather	13°C (55°F)	86 mm (3.4 inches)	80%	very high
April Weather	13°C (56°F)	17 mm (0.7 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	17°C (63°F)	1 mm (0.0 inches)	75%	extreme
August Weather	18°C (64°F)	1 mm (0.0 inches)	72%	extreme
September Weather	18°C (64°F)	1 mm (0.1 inches)	70%	very high
October Weather	18°C (64°F)	9 mm (0.4 inches)	70%	high
November Weather	16°C (61°F)	25 mm (1.0 inches)	74%	moderate
December Weather	14°C (57°F)	69 mm (2.7 inches)	76%	moderate