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September Weather in Stock Island, United States

Last updated: June 24, 2025

The average temperature in Stock Island, United States during September reaches a pleasant 28°C (83°F). Temperatures can dip to a comfortable 25°C (77°F) and peak at 30°C (86°F). Visitors should be prepared for precipitation, averaging 172 mm (6.8 in) over approximately 17 days, accompanied by a humidity level of 76%.

September Temperature in Stock Island

In September in Stock Island, the average temperature is 28°C (83°F), with maximums reaching 30°C (86°F) and minimums dropping to as low as 25°C (77°F). This makes it an ideal time for travelers seeking warm and pleasant weather.

September Weather in Stock Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Stock Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stock Island, September typically has an average temperature of 28°C (83°F), with highs reaching up to 30°C (86°F) and lows dropping to around 25°C (77°F).
JanFebMarAprMayJunJulAugSepOctNovDec717374777982838482817774
Data source: Temperature data for Stock Island 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 Stock Island

In Stock Island, in September, the precipitation amount is 172 mm (6.8 in) spread over 17 days.

September Precipitation Trends in Stock Island

The chart displays monthly precipitation patterns in Stock Island, 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 Stock Island, September typically receives around 172 mm (6.8 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec27271840139941031001721338344
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stock Island

In Stock Island in September, humidity is 76%. With an average temperature of 28°C (83°F), this humidity feels like a warm, sticky embrace, making outdoor activities challenging and requiring travelers to stay hydrated and take frequent breaks in the shade.

September Average Humidity in Stock Island

This chart illustrates the average monthly humidity levels in Stock Island, 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 Stock Island is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%80%76%73%71%70%70%72%76%79%80%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stock Island

In Stock Island 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 Stock Island.

Maximum UV Index Levels in Stock Island for September

The chart shows the monthly maximum UV Index (UVI) for Stock Island 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 Stock Island typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec79111212131212111086
Data source: Stock Island 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 Stock Island Compares to Other Months

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

This table compares monthly weather conditions in Stock Island, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (71°F)27 mm (1.1 inches)81%high
February Weather23°C (74°F)27 mm (1.1 inches)79%very high
March Weather23°C (74°F)18 mm (0.7 inches)76%extreme
April Weather25°C (77°F)40 mm (1.6 inches)73%extreme
May Weather26°C (79°F)139 mm (5.5 inches)71%extreme
June Weather28°C (82°F)94 mm (3.7 inches)69%extreme
July Weather28°C (83°F)103 mm (4.0 inches)70%extreme
August Weather29°C (84°F)100 mm (3.9 inches)72%extreme
September Weather28°C (83°F)172 mm (6.8 inches)76%extreme
October Weather27°C (81°F)133 mm (5.2 inches)79%very high
November Weather25°C (77°F)83 mm (3.3 inches)80%very high
December Weather23°C (74°F)44 mm (1.7 inches)81%high

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