September Weather in Jacksonville, United States

Last updated: June 24, 2025

In Jacksonville, United States, the average temperature in September hovers around 24°C (76°F), with a comfortable range from a minimum of 10°C (50°F) to a maximum of 35°C (95°F). During this month, expect about 224 mm (8.8 in) of precipitation spread over 13 days, contributing to an average humidity level of 79%. Plan accordingly to make the most of your visit!

September Temperature in Jacksonville

In September in Jacksonville, the average temperature is 24°C (76°F). The maximum can reach 35°C (95°F), while the minimum can be as low as 10°C (50°F). Be prepared for warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Jacksonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jacksonville, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (95°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Jacksonville

In Jacksonville in September, the precipitation amount is 224 mm (8.8 in) spread over 13 days.

September Precipitation Trends in Jacksonville

The chart displays monthly precipitation patterns in Jacksonville, 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 Jacksonville, September typically receives around 224 mm (8.8 inches) of precipitation spread over approximately 13 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 Jacksonville

In Jacksonville in September, humidity is 79%. With an average temperature of 24°C (76°F), this humidity feels like a thick blanket wrapped around you, making traveling somewhat uncomfortable and sticky, as you navigate through the warmth while constantly seeking shade and hydration.

September Average Humidity in Jacksonville

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

In Jacksonville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Jacksonville.

Maximum UV Index Levels in Jacksonville for September

The chart shows the monthly maximum UV Index (UVI) for Jacksonville 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 Jacksonville typically reaches 9, which falls under the very high exposure category.

Data source: Jacksonville 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 Jacksonville Compares to Other Months

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

This table compares monthly weather conditions in Jacksonville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	73 mm (2.9 inches)	85%	moderate
February Weather	11°C (52°F)	98 mm (3.8 inches)	82%	high
March Weather	13°C (55°F)	67 mm (2.6 inches)	81%	very high
April Weather	17°C (63°F)	114 mm (4.5 inches)	80%	very high
May Weather	22°C (72°F)	122 mm (4.8 inches)	81%	extreme
June Weather	25°C (77°F)	191 mm (7.5 inches)	81%	extreme
July Weather	27°C (80°F)	176 mm (6.9 inches)	81%	extreme
August Weather	26°C (79°F)	215 mm (8.5 inches)	80%	very high
September Weather	24°C (76°F)	224 mm (8.8 inches)	79%	very high
October Weather	20°C (68°F)	69 mm (2.7 inches)	80%	very high
November Weather	13°C (55°F)	110 mm (4.3 inches)	85%	high
December Weather	10°C (50°F)	116 mm (4.6 inches)	86%	moderate