September Weather in Flagler, United States

Last updated: June 24, 2025

In September, the average temperature in Flagler, United States hovers around 20°C (69°F), creating a comfortable atmosphere for outdoor activities. However, be prepared for a bit of a temperature swing, with lows dipping to 0°C (33°F) and highs reaching up to 38°C (100°F). Expect about 23 mm (0.9 in) of precipitation spread over approximately 3 days, while the average humidity levels at an enveloping 79% might add a touch of stickiness to the warm air.

September Temperature in Flagler

In September in Flagler, the average temperature is 20°C (69°F). Maximum temperatures can reach 38°C (100°F), while minimums can drop as low as 0°C (33°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates September temperature patterns in Flagler, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flagler, September typically has an average temperature of 20°C (69°F), with highs reaching up to 38°C (100°F) and lows dropping to around 0°C (33°F).

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

September Precipitation in Flagler

In Flagler in September, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

September Precipitation Trends in Flagler

The chart displays monthly precipitation patterns in Flagler, 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 Flagler, September typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 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 Flagler

In Flagler in September humidity is 79%. With an average temperature of 20°C (69°F), this humidity feels like a warm, steamy embrace, making travel slightly uncomfortable as the air feels heavy and sticky, often leaving you yearning for a cool breeze or air conditioning to escape the dampness.

September Average Humidity in Flagler

This chart illustrates the average monthly humidity levels in Flagler, 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 Flagler is approximately 79%, 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 Flagler

In Flagler 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 Flagler.

Maximum UV Index Levels in Flagler for September

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

Data source: Flagler 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 Flagler Compares to Other Months

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

This table compares monthly weather conditions in Flagler, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (33°F)	14 mm (0.6 inches)	74%	moderate
February Weather	0°C (32°F)	15 mm (0.6 inches)	75%	moderate
March Weather	6°C (44°F)	49 mm (1.9 inches)	66%	very high
April Weather	10°C (50°F)	36 mm (1.4 inches)	62%	very high
May Weather	15°C (59°F)	77 mm (3.0 inches)	74%	extreme
June Weather	22°C (73°F)	41 mm (1.6 inches)	76%	extreme
July Weather	24°C (76°F)	56 mm (2.2 inches)	75%	extreme
August Weather	23°C (74°F)	43 mm (1.7 inches)	80%	extreme
September Weather	20°C (69°F)	23 mm (0.9 inches)	79%	very high
October Weather	10°C (51°F)	32 mm (1.3 inches)	77%	high
November Weather	6°C (43°F)	13 mm (0.5 inches)	74%	moderate
December Weather	2°C (36°F)	9 mm (0.4 inches)	80%	moderate