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September Weather in Keysville, United States

Last updated: June 24, 2025

In September, the average temperature in Keysville, United States is a pleasant 23°C (73°F). However, temperatures can fluctuate significantly, with a minimum of 7°C (45°F) and a scorching maximum of 37°C (98°F). During this time, expect about 99 mm (3.9 in) of precipitation spread across 10 days, resulting in an average humidity of 75%.

September Temperature in Keysville

In September in Keysville, the average temperature is 23°C (73°F). The maximum can reach 37°C (98°F), while the minimum can drop to as low as 7°C (45°F). It's advisable to pack a range of clothing to comfortably enjoy your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Keysville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keysville, September typically has an average temperature of 23°C (73°F), with highs reaching up to 37°C (98°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec414650606975817873644944
Data source: Temperature data for Keysville 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 Keysville

In Keysville in September, the total precipitation amount is 99 mm (3.9 in) spread over a period of 10 days.

September Precipitation Trends in Keysville

The chart displays monthly precipitation patterns in Keysville, 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 Keysville, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec731047211311211079121991167997
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Keysville

In Keysville in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Keysville

This chart illustrates the average monthly humidity levels in Keysville, 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 Keysville is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Keysville

In Keysville 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 Keysville.

Maximum UV Index Levels in Keysville for September

The chart shows the monthly maximum UV Index (UVI) for Keysville 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 Keysville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679111010109753
Data source: Keysville 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 Keysville Compares to Other Months

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

This table compares monthly weather conditions in Keysville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)73 mm (2.9 inches)84%moderate
February Weather8°C (46°F)104 mm (4.1 inches)84%high
March Weather10°C (51°F)72 mm (2.8 inches)84%high
April Weather16°C (60°F)113 mm (4.4 inches)82%very high
May Weather20°C (69°F)112 mm (4.4 inches)82%extreme
June Weather24°C (76°F)110 mm (4.3 inches)83%very high
July Weather27°C (81°F)79 mm (3.1 inches)79%very high
August Weather26°C (78°F)121 mm (4.8 inches)77%very high
September Weather23°C (73°F)99 mm (3.9 inches)75%very high
October Weather18°C (64°F)116 mm (4.6 inches)81%high
November Weather10°C (50°F)79 mm (3.1 inches)87%moderate
December Weather7°C (44°F)97 mm (3.8 inches)85%moderate

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