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September Weather in Stuart, United States

Last updated: June 24, 2025

In Stuart, United States, the average temperature in September hovers around 20°C (69°F), creating a comfortable climate for outdoor activities. However, expect a range in temperatures, with a minimum of 5°C (41°F) and a maximum of 34°C (94°F). During this month, precipitation totals about 102 mm (4.0 in), typically spread over 10 days, while the air carries an average humidity of 73%.

September Temperature in Stuart

In September in Stuart, the average temperature is 20°C (69°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 5°C (41°F). This makes Stuart a suitable destination for travelers looking to experience mild weather with the possibility of warmer days.

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

The chart illustrates September temperature patterns in Stuart, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stuart, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec232440496274777468523931
Data source: Temperature data for Stuart 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 Stuart

In Stuart in September, the total precipitation amount is 102 mm (4.0 in) falling over the course of 10 days.

September Precipitation Trends in Stuart

The chart displays monthly precipitation patterns in Stuart, 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 Stuart, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3538846917711370961021183537
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Stuart

In Stuart in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Stuart

This chart illustrates the average monthly humidity levels in Stuart, 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 Stuart is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stuart

In Stuart in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Stuart.

Maximum UV Index Levels in Stuart for September

The chart shows the monthly maximum UV Index (UVI) for Stuart 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 Stuart typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810111098643
Data source: Stuart 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 Stuart Compares to Other Months

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

This table compares monthly weather conditions in Stuart, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)35 mm (1.4 inches)78%moderate
February Weather-4°C (24°F)38 mm (1.5 inches)80%moderate
March Weather4°C (40°F)84 mm (3.3 inches)77%high
April Weather10°C (49°F)69 mm (2.7 inches)77%very high
May Weather17°C (62°F)177 mm (7.0 inches)77%very high
June Weather23°C (75°F)113 mm (4.4 inches)81%extreme
July Weather25°C (77°F)70 mm (2.8 inches)81%very high
August Weather23°C (74°F)96 mm (3.8 inches)77%very high
September Weather20°C (69°F)102 mm (4.0 inches)73%very high
October Weather11°C (52°F)118 mm (4.7 inches)75%high
November Weather4°C (39°F)35 mm (1.4 inches)85%moderate
December Weather-1°C (31°F)37 mm (1.4 inches)83%moderate

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