September Weather in Green Isle, United States

Last updated: June 24, 2025

In Green Isle, United States, the average temperature in September hovers around 18°C (64°F). However, temperatures can vary widely, with a minimum of 2°C (35°F) and a maximum reaching up to 33°C (91°F). Expect an average precipitation of 111 mm (4.4 in) spread over 10 days, while the humidity remains comfortably high at 81%.

September Temperature in Green Isle

In September in Green Isle, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (35°F). It's advisable to pack layers to accommodate the warm days and cooler nights when traveling during this time.

September Weather in Green Isle: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Green Isle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Green Isle, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).

Data source: Temperature data for Green Isle generated using information from the Copernicus Climate Change Service.

September Precipitation in Green Isle

In Green Isle in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Green Isle

The chart displays monthly precipitation patterns in Green Isle, 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 Green Isle, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Green Isle

In Green Isle in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Green Isle

This chart illustrates the average monthly humidity levels in Green Isle, 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 Green Isle is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Green Isle

In Green Isle in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Green Isle.

Maximum UV Index Levels in Green Isle for September

The chart shows the monthly maximum UV Index (UVI) for Green Isle 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 Green Isle typically reaches 7, which falls under the high exposure category.

Data source: Green Isle 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 Green Isle Compares to Other Months

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

This table compares monthly weather conditions in Green Isle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	27 mm (1.1 inches)	87%	moderate
February Weather	-9°C (16°F)	29 mm (1.2 inches)	90%	moderate
March Weather	0°C (33°F)	59 mm (2.3 inches)	85%	moderate
April Weather	6°C (43°F)	80 mm (3.1 inches)	84%	high
May Weather	15°C (59°F)	122 mm (4.8 inches)	78%	very high
June Weather	22°C (72°F)	91 mm (3.6 inches)	80%	very high
July Weather	23°C (74°F)	107 mm (4.2 inches)	81%	very high
August Weather	21°C (71°F)	150 mm (5.9 inches)	81%	very high
September Weather	18°C (64°F)	111 mm (4.4 inches)	81%	high
October Weather	9°C (48°F)	95 mm (3.8 inches)	84%	moderate
November Weather	1°C (34°F)	32 mm (1.2 inches)	88%	moderate
December Weather	-5°C (23°F)	42 mm (1.7 inches)	84%	low