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September Weather in Martinsburg, United States

Last updated: June 24, 2025

In Martinsburg, United States, the average temperature in September hovers around 21°C (70°F). You'll experience a range of conditions, with minimum temperatures dipping to 4°C (39°F) and maximums soaring to 35°C (96°F). During this month, expect 109 mm (4.3 in) of precipitation over approximately 9 days, contributing to an average humidity of 68%. If you're planning to visit, be prepared for a mix of warm and cool days!

September Temperature in Martinsburg

In September in Martinsburg, the average temperature is 21°C (70°F), with maximums reaching up to 35°C (96°F) and minimums dropping as low as 4°C (39°F). This makes Martinsburg an ideal destination for travelers seeking a mix of warm weather and cooler evenings.

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 21°C (70°F), with highs reaching up to 35°C (96°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec343844546473797670604538
Data source: Temperature data for Martinsburg generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Martinsburg

In Martinsburg in September, the total precipitation amount is 109 mm (4.3 in) spread over 9 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 109 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec639286106135103116981101077894
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Martinsburg

In Martinsburg in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098743
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)63 mm (2.5 inches)86%moderate
February Weather3°C (38°F)92 mm (3.6 inches)86%moderate
March Weather7°C (44°F)86 mm (3.4 inches)86%high
April Weather12°C (55°F)106 mm (4.2 inches)84%very high
May Weather18°C (65°F)135 mm (5.3 inches)78%very high
June Weather23°C (73°F)103 mm (4.0 inches)79%very high
July Weather26°C (79°F)116 mm (4.5 inches)70%very high
August Weather25°C (76°F)98 mm (3.8 inches)59%very high
September Weather21°C (70°F)109 mm (4.3 inches)68%very high
October Weather15°C (60°F)107 mm (4.2 inches)80%high
November Weather7°C (45°F)78 mm (3.1 inches)86%moderate
December Weather3°C (38°F)94 mm (3.7 inches)85%moderate

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