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September Weather in Jacksonville, United States

Last updated: June 24, 2025

In Jacksonville, United States, the average temperature in September hovers around 26°C (80°F), making it a delightful time to enjoy the outdoors. Visitors can expect temperatures to range from a refreshing 11°C (52°F) to a sweltering 39°C (102°F). With an average humidity of 69%, the air can feel quite warm. Just be prepared for some rain, as 85 mm (3.3 in) of precipitation is likely across 9 days. Embrace the unique climate and plan accordingly!

September Temperature in Jacksonville

In September in Jacksonville, the average temperature is 26°C (80°F). Maximum temperatures can reach up to 39°C (102°F), while the minimum can drop as low as 11°C (52°F). Be prepared for a wide range of temperatures to make the most of your travel experience.

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 26°C (80°F), with highs reaching up to 39°C (102°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec495261667581848580705853
Data source: Temperature data for Jacksonville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Jacksonville

In Jacksonville in September, the precipitation amount is 85 mm (3.3 in) over the course of 9 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 85 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10914012013214810079798511165115
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jacksonville

In Jacksonville in September, humidity is 69%. With an average temperature of 26°C (80°F), this humidity feels like a warm, steamy embrace, making outdoor activities slightly sweaty and requiring frequent breaks for hydration but still inviting for leisurely strolls or exploring local attractions.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111121110864
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.
 TemperaturePrecipitationHumidityUV
January Weather10°C (49°F)109 mm (4.3 inches)79%moderate
February Weather11°C (52°F)140 mm (5.5 inches)80%high
March Weather16°C (62°F)119 mm (4.7 inches)78%very high
April Weather19°C (66°F)132 mm (5.2 inches)79%very high
May Weather24°C (75°F)148 mm (5.8 inches)81%extreme
June Weather27°C (81°F)100 mm (4.0 inches)77%extreme
July Weather29°C (85°F)79 mm (3.1 inches)71%extreme
August Weather29°C (85°F)79 mm (3.1 inches)67%extreme
September Weather26°C (80°F)85 mm (3.3 inches)69%very high
October Weather21°C (70°F)111 mm (4.4 inches)73%very high
November Weather14°C (58°F)65 mm (2.5 inches)82%high
December Weather12°C (54°F)115 mm (4.5 inches)87%moderate

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