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September Weather in Fort Pierce, United States

Last updated: June 24, 2025

In Fort Pierce, United States, the average temperature in September is a warm 28°C (82°F), with daytime highs reaching up to 33°C (91°F) and nighttime lows dipping to 24°C (75°F). Prepare for a wet month, as you'll experience about 168 mm (6.6 in) of rainfall over 23 days. Additionally, the average humidity is a high 83%, creating a tropical environment perfect for those who enjoy warm, lush conditions.

September Temperature in Fort Pierce

In September in Fort Pierce, the average temperature is 28°C (82°F), with maximums reaching up to 33°C (91°F) and minimums dipping as low as 24°C (75°F). This warm weather makes it an ideal time for travelers seeking a sunny getaway.

September Weather in Fort Pierce: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fort Pierce, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Pierce, September typically has an average temperature of 28°C (82°F), with highs reaching up to 33°C (91°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec677172757881828282807470
Data source: Temperature data for Fort Pierce 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 Fort Pierce

In Fort Pierce in September, the total precipitation amount is 168 mm (6.6 in) spread over 23 days.

September Precipitation Trends in Fort Pierce

The chart displays monthly precipitation patterns in Fort Pierce, 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 Fort Pierce, September typically receives around 168 mm (6.6 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec384831691251731751941691338354
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fort Pierce

In Fort Pierce in September humidity is 83%. With an average temperature of 28°C (82°F), this humidity feels like stepping into a warm, thick blanket, making travel languid and drenched in sweat.

September Average Humidity in Fort Pierce

This chart illustrates the average monthly humidity levels in Fort Pierce, 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 Fort Pierce is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fort Pierce

In Fort Pierce in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Fort Pierce.

Maximum UV Index Levels in Fort Pierce for September

The chart shows the monthly maximum UV Index (UVI) for Fort Pierce 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 Fort Pierce typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111112121211975
Data source: Fort Pierce 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 Fort Pierce Compares to Other Months

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

This table compares monthly weather conditions in Fort Pierce, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)38 mm (1.5 inches)83%high
February Weather22°C (71°F)48 mm (1.9 inches)80%very high
March Weather22°C (72°F)31 mm (1.2 inches)75%very high
April Weather24°C (75°F)69 mm (2.7 inches)68%extreme
May Weather26°C (78°F)125 mm (4.9 inches)65%extreme
June Weather27°C (81°F)173 mm (6.8 inches)73%extreme
July Weather28°C (82°F)175 mm (6.9 inches)77%extreme
August Weather28°C (83°F)194 mm (7.6 inches)80%extreme
September Weather28°C (82°F)168 mm (6.6 inches)83%extreme
October Weather26°C (80°F)133 mm (5.2 inches)83%very high
November Weather23°C (74°F)83 mm (3.3 inches)83%high
December Weather21°C (70°F)54 mm (2.1 inches)84%moderate

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