September Weather in Fillmore, United States

Last updated: June 24, 2025

In September, the average temperature in Fillmore, United States is a pleasant 19°C (66°F). However, you may experience a range from a chilly -7°C (20°F) to a sweltering 36°C (97°F). The area receives a modest 17 mm (0.7 in) of precipitation over about 3 days, while the average humidity lingers around a comfortable 47%.

September Temperature in Fillmore

In September in Fillmore, the average temperature is 19°C (66°F). Maximum temperatures can soar to 36°C (97°F), while minimums can dip as low as -7°C (20°F). Understanding these temperature extremes will help you pack appropriately for your travels.

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

The chart illustrates September temperature patterns in Fillmore, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fillmore, September typically has an average temperature of 19°C (66°F), with highs reaching up to 36°C (97°F) and lows dropping to around -7°C (20°F).

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

September Precipitation in Fillmore

In Fillmore in September, the precipitation amount is 17 mm (0.7 in) over the course of 3 days.

September Precipitation Trends in Fillmore

The chart displays monthly precipitation patterns in Fillmore, 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 Fillmore, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Fillmore

In Fillmore in September, humidity is 47%. With an average temperature of 19°C (66°F), this humidity feels like a comfortable embrace, making it pleasant for traveling as you explore the sights without feeling overheated.

September Average Humidity in Fillmore

This chart illustrates the average monthly humidity levels in Fillmore, 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 Fillmore is approximately 47%, 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 Fillmore

In Fillmore 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 Fillmore.

Maximum UV Index Levels in Fillmore for September

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

Data source: Fillmore 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 Fillmore Compares to Other Months

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

This table compares monthly weather conditions in Fillmore, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	44 mm (1.7 inches)	87%	moderate
February Weather	-2°C (29°F)	53 mm (2.1 inches)	88%	high
March Weather	3°C (38°F)	63 mm (2.5 inches)	77%	very high
April Weather	8°C (47°F)	48 mm (1.9 inches)	69%	very high
May Weather	14°C (57°F)	45 mm (1.8 inches)	54%	extreme
June Weather	22°C (71°F)	7 mm (0.3 inches)	45%	extreme
July Weather	26°C (78°F)	13 mm (0.5 inches)	37%	extreme
August Weather	24°C (76°F)	16 mm (0.6 inches)	34%	extreme
September Weather	19°C (66°F)	17 mm (0.7 inches)	47%	very high
October Weather	9°C (48°F)	41 mm (1.6 inches)	67%	high
November Weather	4°C (40°F)	31 mm (1.2 inches)	82%	moderate
December Weather	-3°C (27°F)	43 mm (1.7 inches)	87%	moderate