September Weather in Irmo, United States

Last updated: June 24, 2025

In Irmo, United States, the average temperature in September hovers around 25°C (77°F). However, be prepared for fluctuations, as temperatures can dip to a cool 11°C (53°F) or soar to a scorching 36°C (97°F). Expect some rain, with 93 mm (3.7 in) of precipitation spread over 8 days, contributing to an average humidity of 83%. Whether you're strolling through town or exploring nature, the weather is sure to keep you on your toes!

September Temperature in Irmo

In September in Irmo, the average temperature is 25°C (77°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop to as low as 11°C (53°F). This makes Irmo an ideal destination for travelers seeking comfortable weather with warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Irmo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Irmo, September typically has an average temperature of 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Irmo

In Irmo in September, the total precipitation amount is 93 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Irmo

The chart displays monthly precipitation patterns in Irmo, 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 Irmo, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 8 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 Irmo

In Irmo in September humidity is 83%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket, making it essential for travelers to stay hydrated and seek shade to enjoy their adventures comfortably.

September Average Humidity in Irmo

This chart illustrates the average monthly humidity levels in Irmo, 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 Irmo is approximately 83%, 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 Irmo

In Irmo 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 Irmo.

Maximum UV Index Levels in Irmo for September

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

Data source: Irmo 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 Irmo Compares to Other Months

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

This table compares monthly weather conditions in Irmo, 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 (48°F)	85 mm (3.3 inches)	86%	moderate
February Weather	12°C (53°F)	108 mm (4.3 inches)	81%	high
March Weather	14°C (57°F)	79 mm (3.1 inches)	81%	very high
April Weather	18°C (64°F)	107 mm (4.2 inches)	79%	very high
May Weather	23°C (73°F)	102 mm (4.0 inches)	75%	very high
June Weather	26°C (78°F)	99 mm (3.9 inches)	75%	extreme
July Weather	27°C (81°F)	142 mm (5.6 inches)	80%	extreme
August Weather	27°C (80°F)	137 mm (5.4 inches)	81%	extreme
September Weather	25°C (77°F)	93 mm (3.7 inches)	83%	very high
October Weather	20°C (69°F)	77 mm (3.0 inches)	78%	very high
November Weather	13°C (55°F)	68 mm (2.7 inches)	85%	high
December Weather	10°C (51°F)	124 mm (4.9 inches)	87%	moderate