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September Weather in Miami, United States

Last updated: June 24, 2025

In September, the average temperature in Miami, United States reaches a comfortable 25°C (77°F). However, temperatures can vary significantly, with lows of 9°C (48°F) and highs soaring up to 39°C (102°F). Visitors can expect an average precipitation of 44 mm (1.7 in) spread over 5 days, accompanied by a moderate humidity level of 64%.

September Temperature in Miami

In September in Miami, the average temperature is 25°C (77°F). Maximum temperatures can reach 39°C (102°F), while minimums can dip as low as 9°C (48°F). This variation makes it essential for travelers to pack both light clothing for the heat and warmer layers for cooler evenings.

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

The chart illustrates September temperature patterns in Miami, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Miami, September typically has an average temperature of 25°C (77°F), with highs reaching up to 39°C (102°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec454754647182838277655546
Data source: Temperature data for Miami 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 Miami

In Miami in September, the precipitation amount is 44 mm (1.7 in) over the course of 5 days.

September Precipitation Trends in Miami

The chart displays monthly precipitation patterns in Miami, 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 Miami, September typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec5660444105764744372742
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Miami

In Miami in September, humidity is 64%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor excursions feel a bit heavier, yet still inviting for travelers seeking a vibrant atmosphere.

September Average Humidity in Miami

This chart illustrates the average monthly humidity levels in Miami, 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 Miami is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Miami

In Miami 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 Miami.

Maximum UV Index Levels in Miami for September

The chart shows the monthly maximum UV Index (UVI) for Miami 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 Miami typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111212121110864
Data source: Miami 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 Miami Compares to Other Months

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

This table compares monthly weather conditions in Miami, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)56 mm (2.2 inches)76%moderate
February Weather8°C (48°F)60 mm (2.4 inches)79%high
March Weather12°C (54°F)44 mm (1.7 inches)67%very high
April Weather18°C (64°F)4 mm (0.2 inches)55%extreme
May Weather22°C (71°F)10 mm (0.4 inches)40%extreme
June Weather28°C (83°F)5 mm (0.2 inches)33%extreme
July Weather28°C (83°F)76 mm (3.0 inches)34%extreme
August Weather28°C (82°F)47 mm (1.8 inches)48%extreme
September Weather25°C (77°F)44 mm (1.7 inches)64%very high
October Weather18°C (65°F)37 mm (1.4 inches)67%very high
November Weather13°C (56°F)27 mm (1.1 inches)77%high
December Weather8°C (46°F)42 mm (1.6 inches)82%moderate

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