September Weather in Gwynn, United States

Last updated: June 24, 2025

In Gwynn, United States, the average temperature in September hovers around 24°C (75°F). Daily highs can reach up to 30°C (86°F), while the lows may dip to 16°C (61°F). Expect 128 mm (5.1 in) of precipitation over 10 days, accompanied by a comfortable average humidity of 78%. Plan accordingly for your visit to enjoy the best of the season!

September Temperature in Gwynn

In September in Gwynn, the average temperature is 24°C (75°F). Maximums can reach 30°C (86°F), and minimums can be as low as 16°C (61°F). This comfortable climate makes Gwynn an ideal destination for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in Gwynn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gwynn, September typically has an average temperature of 24°C (75°F), with highs reaching up to 30°C (86°F) and lows dropping to around 16°C (61°F).

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

September Precipitation in Gwynn

In Gwynn in September, the precipitation amount is 128 mm (5.1 in) spread over a period of 10 days.

September Precipitation Trends in Gwynn

The chart displays monthly precipitation patterns in Gwynn, 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 Gwynn, September typically receives around 128 mm (5.1 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Gwynn

In Gwynn in September humidity is 78%. With an average temperature of 24°C (75°F), this humidity feels like a warm blanket wrapping around you, making travel sticky and heavy but also inviting, as long as you're prepared with plenty of water and light clothing.

September Average Humidity in Gwynn

This chart illustrates the average monthly humidity levels in Gwynn, 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 Gwynn is approximately 78%, 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 Gwynn

In Gwynn 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 Gwynn.

Maximum UV Index Levels in Gwynn for September

The chart shows the monthly maximum UV Index (UVI) for Gwynn 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 Gwynn typically reaches 8, which falls under the very high exposure category.

Data source: Gwynn 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 Gwynn Compares to Other Months

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

This table compares monthly weather conditions in Gwynn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	102 mm (4.0 inches)	84%	moderate
February Weather	6°C (43°F)	140 mm (5.5 inches)	83%	moderate
March Weather	8°C (47°F)	105 mm (4.1 inches)	82%	high
April Weather	13°C (56°F)	99 mm (3.9 inches)	81%	very high
May Weather	19°C (66°F)	92 mm (3.6 inches)	80%	very high
June Weather	24°C (75°F)	84 mm (3.3 inches)	82%	very high
July Weather	27°C (80°F)	120 mm (4.7 inches)	81%	very high
August Weather	26°C (79°F)	133 mm (5.2 inches)	81%	very high
September Weather	24°C (75°F)	128 mm (5.1 inches)	78%	very high
October Weather	19°C (67°F)	121 mm (4.8 inches)	80%	high
November Weather	12°C (53°F)	93 mm (3.6 inches)	84%	moderate
December Weather	8°C (46°F)	117 mm (4.6 inches)	84%	moderate