September Weather in Myrtle, United States

Last updated: June 24, 2025

In September, the average temperature in Myrtle, United States hovers around 24°C (76°F), creating a comfortable climate. However, temperatures can vary significantly, with a minimum of 10°C (51°F) and a maximum reaching 37°C (99°F). Expect a precipitation amount of 116 mm (4.6 in) over 7 days, contributing to an average humidity level of 70%.

September Temperature in Myrtle

In September in Myrtle, the average temperature is 24°C (76°F), with maximums reaching 37°C (99°F) and minimums dipping as low as 10°C (51°F). This makes it an ideal time for travelers seeking warm weather along with comfortable evenings.

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

The chart illustrates September temperature patterns in Myrtle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Myrtle, September typically has an average temperature of 24°C (76°F), with highs reaching up to 37°C (99°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Myrtle

In Myrtle in September, the total precipitation amount is 116 mm (4.6 in) accumulated over a span of 7 days.

September Precipitation Trends in Myrtle

The chart displays monthly precipitation patterns in Myrtle, 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 Myrtle, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 7 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 Myrtle

In Myrtle in September, humidity is 70%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel a bit sticky and heavier, so travelers should stay hydrated and take regular breaks to enjoy the sights comfortably.

September Average Humidity in Myrtle

This chart illustrates the average monthly humidity levels in Myrtle, 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 Myrtle is approximately 70%, 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 Myrtle

In Myrtle in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Myrtle.

Maximum UV Index Levels in Myrtle for September

The chart shows the monthly maximum UV Index (UVI) for Myrtle 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 Myrtle typically reaches 9, which falls under the very high exposure category.

Data source: Myrtle 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 Myrtle Compares to Other Months

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

This table compares monthly weather conditions in Myrtle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	120 mm (4.7 inches)	86%	moderate
February Weather	9°C (48°F)	188 mm (7.4 inches)	85%	high
March Weather	14°C (57°F)	157 mm (6.2 inches)	84%	very high
April Weather	16°C (62°F)	146 mm (5.8 inches)	81%	very high
May Weather	22°C (72°F)	110 mm (4.3 inches)	83%	extreme
June Weather	26°C (78°F)	133 mm (5.2 inches)	83%	extreme
July Weather	27°C (81°F)	118 mm (4.6 inches)	80%	extreme
August Weather	26°C (80°F)	113 mm (4.4 inches)	73%	very high
September Weather	24°C (76°F)	116 mm (4.6 inches)	70%	very high
October Weather	18°C (65°F)	106 mm (4.2 inches)	73%	high
November Weather	11°C (51°F)	79 mm (3.1 inches)	85%	high
December Weather	9°C (48°F)	150 mm (5.9 inches)	88%	moderate