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September Weather in Lorton, United States

Last updated: June 24, 2025

In September, the average temperature in Lorton, United States hovers around 22°C (72°F), providing a pleasant climate. Expect minimums of 7°C (45°F) and maximums reaching 37°C (99°F). With an average humidity of 75%, the weather might feel a bit sticky at times. Don't forget your umbrella, as precipitation amounts to 96 mm (3.8 in) spread over 11 days during the month!

September Temperature in Lorton

In September in Lorton, the average temperature is 22°C (72°F), with maximums soaring up to 37°C (99°F) and minimums dipping as low as 7°C (45°F). This diverse range makes it an ideal time for travelers to enjoy both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Lorton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lorton, September typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (99°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec374147576775817872634841
Data source: Temperature data for Lorton 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 Lorton

In Lorton in September, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.

September Precipitation Trends in Lorton

The chart displays monthly precipitation patterns in Lorton, 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 Lorton, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec619681102125109119152961078191
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lorton

In Lorton in September, humidity is 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

September Average Humidity in Lorton

This chart illustrates the average monthly humidity levels in Lorton, 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 Lorton is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lorton

In Lorton 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 Lorton.

Maximum UV Index Levels in Lorton for September

The chart shows the monthly maximum UV Index (UVI) for Lorton 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 Lorton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Lorton 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 Lorton Compares to Other Months

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

This table compares monthly weather conditions in Lorton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)61 mm (2.4 inches)84%moderate
February Weather5°C (42°F)96 mm (3.8 inches)83%moderate
March Weather8°C (47°F)81 mm (3.2 inches)83%high
April Weather14°C (57°F)102 mm (4.0 inches)81%very high
May Weather19°C (67°F)125 mm (4.9 inches)78%very high
June Weather24°C (76°F)109 mm (4.3 inches)79%very high
July Weather27°C (81°F)119 mm (4.7 inches)74%very high
August Weather25°C (78°F)152 mm (6.0 inches)72%very high
September Weather22°C (72°F)96 mm (3.8 inches)75%very high
October Weather17°C (63°F)107 mm (4.2 inches)81%high
November Weather9°C (48°F)81 mm (3.2 inches)85%moderate
December Weather5°C (42°F)91 mm (3.6 inches)84%moderate

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