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September Weather in Arlington, United States

Last updated: June 24, 2025

In Arlington, United States, the average temperature in September hovers around 26°C (79°F). During this time, temperatures can dip as low as 13°C (56°F) and soar to a sizzling 37°C (100°F). Expect 115 mm (4.5 in) of precipitation spread over 10 days, contributing to an average humidity level of 83%. Stay prepared for a warm and humid month ahead!

September Temperature in Arlington

In September, in Arlington, the average temperature is 26°C (79°F). Maximums can reach 37°C (100°F), while minimums can drop as low as 13°C (56°F). This makes Arlington an ideal destination for travelers seeking warm weather, but it's wise to pack for both hot days and cooler nights.

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 26°C (79°F), with highs reaching up to 37°C (100°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec515762677580828279725854
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 115 mm (4.5 in) over a span of 10 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 115 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8811485113891031191231159849125
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 83%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making travel an exercise in endurance as the air clings to your skin and saps your energy.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589101111111110864
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 Weather11°C (52°F)88 mm (3.5 inches)85%moderate
February Weather14°C (58°F)114 mm (4.5 inches)82%very high
March Weather17°C (62°F)85 mm (3.3 inches)80%very high
April Weather19°C (67°F)113 mm (4.4 inches)76%very high
May Weather24°C (75°F)89 mm (3.5 inches)73%extreme
June Weather26°C (80°F)103 mm (4.0 inches)74%extreme
July Weather28°C (82°F)119 mm (4.7 inches)80%extreme
August Weather28°C (82°F)123 mm (4.8 inches)79%extreme
September Weather26°C (79°F)115 mm (4.5 inches)83%very high
October Weather22°C (72°F)98 mm (3.9 inches)77%very high
November Weather15°C (59°F)49 mm (1.9 inches)84%high
December Weather12°C (54°F)125 mm (4.9 inches)88%moderate

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