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September Weather in Arlington, United States

Last updated: June 24, 2025

In September, the average temperature in Arlington, United States is a comfortable 19°C (67°F). However, temperatures can vary significantly, with a minimum of 4°C (40°F) and soaring up to 38°C (101°F). Expect light rainfall with an average precipitation of 12 mm (0.5 in) spread over just 3 days. The climate is moderate, with an average humidity of 59%, making it a pleasant time to visit!

September Temperature in Arlington

In September in Arlington, the average temperature is 19°C (67°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 4°C (40°F). This climate makes Arlington an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Arlington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arlington, September typically has an average temperature of 19°C (67°F), with highs reaching up to 38°C (101°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec363744526169777666524336
Data source: Temperature data for Arlington 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 Arlington

In Arlington in September, the precipitation amount is 12 mm (0.5 in) during a span of 3 days.

September Precipitation Trends in Arlington

The chart displays monthly precipitation patterns in Arlington, 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 Arlington, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec485931301881512284051
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Arlington

In Arlington in September humidity is 59%. With an average temperature of 19°C (67°F), this humidity feels like a gentle embrace that can be refreshing during sightseeing but may feel a bit sticky if you're on the move for extended periods.

September Average Humidity in Arlington

This chart illustrates the average monthly humidity levels in Arlington, 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 Arlington is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%85%80%82%79%63%59%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Arlington

In Arlington 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 Arlington.

Maximum UV Index Levels in Arlington for September

The chart shows the monthly maximum UV Index (UVI) for Arlington 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 Arlington typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24579101098532
Data source: Arlington 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 Arlington Compares to Other Months

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

This table compares monthly weather conditions in Arlington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)48 mm (1.9 inches)86%low
February Weather3°C (37°F)58 mm (2.3 inches)87%moderate
March Weather7°C (45°F)31 mm (1.2 inches)86%moderate
April Weather11°C (52°F)30 mm (1.2 inches)85%high
May Weather16°C (62°F)18 mm (0.7 inches)80%very high
June Weather21°C (69°F)8 mm (0.3 inches)82%very high
July Weather25°C (77°F)1 mm (0.0 inches)78%very high
August Weather25°C (77°F)4 mm (0.2 inches)62%very high
September Weather19°C (67°F)12 mm (0.5 inches)59%very high
October Weather11°C (53°F)28 mm (1.1 inches)78%moderate
November Weather6°C (43°F)40 mm (1.6 inches)88%moderate
December Weather2°C (36°F)51 mm (2.0 inches)88%low

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