September Weather in Martinsburg, United States

Last updated: June 24, 2025

In Martinsburg, United States, the average temperature in September hovers around 19°C (67°F), with a minimum of 3°C (38°F) and soaring to a maximum of 33°C (91°F). Expect approximately 128 mm (5.0 in) of precipitation spread over 10 days, contributing to an average humidity of 67%. Whether you're basking in the sun or enjoying the cooler moments, this month offers a blend of weather experiences!

September Temperature in Martinsburg

In September in Martinsburg, the average temperature is 19°C (67°F). Maximums can reach 33°C (91°F), and minimums can be as low as 3°C (38°F). This makes Martinsburg a great destination for travelers seeking mild weather and a chance to enjoy a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Martinsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Martinsburg, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Martinsburg

In Martinsburg in September, the total precipitation amount is 128 mm (5.0 in) recorded over a span of 10 days.

September Precipitation Trends in Martinsburg

The chart displays monthly precipitation patterns in Martinsburg, 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 Martinsburg, September typically receives around 128 mm (5.0 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 Martinsburg

In Martinsburg in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

September Average Humidity in Martinsburg

This chart illustrates the average monthly humidity levels in Martinsburg, 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 Martinsburg is approximately 67%, 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 Martinsburg

In Martinsburg 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 Martinsburg.

Maximum UV Index Levels in Martinsburg for September

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

Data source: Martinsburg 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 Martinsburg Compares to Other Months

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

This table compares monthly weather conditions in Martinsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	62 mm (2.4 inches)	89%	moderate
February Weather	1°C (34°F)	102 mm (4.0 inches)	90%	moderate
March Weather	4°C (40°F)	90 mm (3.5 inches)	89%	high
April Weather	10°C (51°F)	104 mm (4.1 inches)	88%	very high
May Weather	16°C (61°F)	122 mm (4.8 inches)	80%	very high
June Weather	21°C (69°F)	113 mm (4.4 inches)	79%	very high
July Weather	24°C (75°F)	111 mm (4.4 inches)	74%	very high
August Weather	23°C (73°F)	98 mm (3.8 inches)	64%	very high
September Weather	19°C (67°F)	128 mm (5.0 inches)	67%	very high
October Weather	13°C (56°F)	110 mm (4.3 inches)	81%	high
November Weather	5°C (41°F)	73 mm (2.9 inches)	89%	moderate
December Weather	2°C (35°F)	90 mm (3.5 inches)	88%	moderate