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September Weather in Mystic Island, United States

Last updated: June 24, 2025

In September, the average temperature in Mystic Island, United States hovers around 22°C (72°F). You can expect temperatures to range from a brisk 9°C (49°F) to a warm 33°C (92°F). With an average precipitation of 112 mm (4.4 in) spread over 11 days, don’t forget your umbrella! The atmosphere is quite humid, with an average humidity level of 74%. Enjoy your visit!

September Temperature in Mystic Island

In September in Mystic Island, the average temperature is 22°C (72°F). The maximum can reach 33°C (92°F), while the minimum can drop to as low as 9°C (49°F). This makes Mystic Island a perfect destination for travelers seeking mild weather with the option for warmer or cooler days.

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

The chart illustrates September temperature patterns in Mystic Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mystic Island, September typically has an average temperature of 22°C (72°F), with highs reaching up to 33°C (92°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec374045546373797772634942
Data source: Temperature data for Mystic 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 Mystic Island

In Mystic Island in September, the precipitation amount is 112 mm (4.4 in) that occurs over the course of 11 days.

September Precipitation Trends in Mystic Island

The chart displays monthly precipitation patterns in Mystic 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 Mystic Island, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec65102109981099012513211213680106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mystic Island

In Mystic Island in September, humidity is 74%. With an average temperature of 22°C (72°F), this humidity feels like a warm blanket enveloping you, making it a bit uncomfortable for traveling, as every step feels heavier and the air is thick.

September Average Humidity in Mystic Island

This chart illustrates the average monthly humidity levels in Mystic 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 Mystic Island is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%81%79%74%77%76%77%74%75%80%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mystic Island

In Mystic Island 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 Mystic Island.

Maximum UV Index Levels in Mystic Island for September

The chart shows the monthly maximum UV Index (UVI) for Mystic 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 Mystic Island typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568101010108743
Data source: Mystic 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 Mystic Island Compares to Other Months

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

This table compares monthly weather conditions in Mystic Island, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)65 mm (2.5 inches)83%moderate
February Weather5°C (41°F)102 mm (4.0 inches)82%moderate
March Weather7°C (45°F)109 mm (4.3 inches)81%high
April Weather12°C (54°F)98 mm (3.9 inches)79%very high
May Weather17°C (63°F)109 mm (4.3 inches)74%very high
June Weather23°C (73°F)90 mm (3.5 inches)77%very high
July Weather26°C (79°F)125 mm (4.9 inches)76%very high
August Weather25°C (77°F)132 mm (5.2 inches)77%very high
September Weather22°C (72°F)112 mm (4.4 inches)74%very high
October Weather17°C (63°F)136 mm (5.4 inches)75%high
November Weather9°C (49°F)80 mm (3.1 inches)80%moderate
December Weather5°C (42°F)106 mm (4.2 inches)81%moderate

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