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September Weather in Williamsburg, United States

Last updated: June 24, 2025

In Williamsburg, United States, the average temperature in September hovers around 19°C (66°F). Expect minimums as low as 2°C (36°F) and maximums reaching 32°C (89°F). With an average precipitation of 130 mm (5.1 in) spread over 10 days, don't forget your umbrella! Humidity levels linger around 67%, adding a touch of mugginess to the air.

September Temperature in Williamsburg

In September, in Williamsburg, the average temperature is 19°C (66°F). The maximum can reach 32°C (89°F), while the minimum can drop as low as 2°C (36°F). It's advisable to pack a mix of clothing to prepare for both warm days and cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Williamsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamsburg, September typically has an average temperature of 19°C (66°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec293339496068747266554034
Data source: Temperature data for Williamsburg 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 Williamsburg

In Williamsburg in September, the precipitation amount is 130 mm (5.1 in) over a period of 10 days.

September Precipitation Trends in Williamsburg

The chart displays monthly precipitation patterns in Williamsburg, 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 Williamsburg, September typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec67106911091291121171001301137893
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Williamsburg

In Williamsburg in September humidity is 67%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace that envelops you as you travel, making each step a little heavier but still comfortable enough to explore the vibrant surroundings.

September Average Humidity in Williamsburg

This chart illustrates the average monthly humidity levels in Williamsburg, 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 Williamsburg is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Williamsburg

In Williamsburg 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 Williamsburg.

Maximum UV Index Levels in Williamsburg for September

The chart shows the monthly maximum UV Index (UVI) for Williamsburg 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 Williamsburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Williamsburg 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 Williamsburg Compares to Other Months

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

This table compares monthly weather conditions in Williamsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)67 mm (2.6 inches)89%moderate
February Weather0°C (33°F)106 mm (4.2 inches)90%moderate
March Weather4°C (39°F)91 mm (3.6 inches)89%high
April Weather10°C (50°F)109 mm (4.3 inches)88%very high
May Weather16°C (60°F)129 mm (5.1 inches)80%very high
June Weather20°C (69°F)112 mm (4.4 inches)79%very high
July Weather23°C (74°F)117 mm (4.6 inches)74%very high
August Weather22°C (72°F)100 mm (3.9 inches)64%very high
September Weather19°C (66°F)130 mm (5.1 inches)67%very high
October Weather13°C (56°F)113 mm (4.4 inches)81%high
November Weather5°C (41°F)78 mm (3.1 inches)89%moderate
December Weather1°C (34°F)93 mm (3.7 inches)88%moderate

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