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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 22°C (72°F). However, be prepared for variability, as temperatures can drop to a brisk 7°C (46°F) or rise to a sweltering 35°C (96°F). During this month, expect about 108 mm (4.2 in) of precipitation over 10 days, accompanied by an average humidity of 67%.

September Temperature in Williamsburg

In September in Williamsburg, the average temperature is 22°C (72°F), with maximums reaching up to 35°C (96°F) and minimums dropping as low as 7°C (46°F). This makes it an ideal time for travelers seeking mild weather and a mix of warm days and cool evenings.

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 22°C (72°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec394450576873787672614743
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 108 mm (4.2 in) distributed over a duration 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 108 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9718814814612212910414610813075136
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 22°C (72°F), this humidity feels like a warm embrace, creating a tropical ambiance that can be both refreshing and slightly stifling for traveling.

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.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679111111109753
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 Weather4°C (39°F)97 mm (3.8 inches)88%moderate
February Weather7°C (44°F)188 mm (7.4 inches)88%high
March Weather10°C (51°F)148 mm (5.8 inches)87%high
April Weather14°C (58°F)146 mm (5.8 inches)84%very high
May Weather20°C (68°F)122 mm (4.8 inches)84%extreme
June Weather23°C (74°F)129 mm (5.1 inches)83%extreme
July Weather25°C (78°F)104 mm (4.1 inches)79%extreme
August Weather24°C (76°F)146 mm (5.7 inches)66%very high
September Weather22°C (72°F)108 mm (4.2 inches)67%very high
October Weather16°C (62°F)130 mm (5.1 inches)76%high
November Weather8°C (47°F)75 mm (2.9 inches)89%moderate
December Weather6°C (44°F)136 mm (5.4 inches)88%moderate

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