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September Weather in Sunbury, United States

Last updated: June 24, 2025

In September, the average temperature in Sunbury, United States is a pleasant 20°C (68°F). Expect daytime highs of up to 33°C (92°F) and nighttime lows around 3°C (38°F). While you're enjoying the mild weather, be prepared for about 117 mm (4.6 in) of precipitation spread across 9 days, creating an average humidity level of 66%.

September Temperature in Sunbury

In September, in Sunbury, the average temperature is 20°C (68°F). Maximum temperatures can reach up to 33°C (92°F), while minimums can drop to as low as 3°C (38°F). This makes Sunbury an ideal destination for travelers seeking pleasant weather and a chance to experience both warm days and cool nights.

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

The chart illustrates September temperature patterns in Sunbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunbury, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec313441516271767468574336
Data source: Temperature data for Sunbury 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 Sunbury

In Sunbury in September, the total precipitation amount is 117 mm (4.6 in) spread over a period of 9 days.

September Precipitation Trends in Sunbury

The chart displays monthly precipitation patterns in Sunbury, 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 Sunbury, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec699789103119871291191171119184
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sunbury

In Sunbury in September, humidity is 66%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but potentially a bit sticky, so travelers should stay hydrated and consider light, breathable clothing for comfort.

September Average Humidity in Sunbury

This chart illustrates the average monthly humidity levels in Sunbury, 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 Sunbury is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sunbury

In Sunbury 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 Sunbury.

Maximum UV Index Levels in Sunbury for September

The chart shows the monthly maximum UV Index (UVI) for Sunbury 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 Sunbury typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Sunbury 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 Sunbury Compares to Other Months

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

This table compares monthly weather conditions in Sunbury, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)69 mm (2.7 inches)87%moderate
February Weather1°C (34°F)97 mm (3.8 inches)85%moderate
March Weather5°C (41°F)89 mm (3.5 inches)85%high
April Weather11°C (51°F)103 mm (4.1 inches)83%very high
May Weather17°C (62°F)119 mm (4.7 inches)75%very high
June Weather22°C (71°F)87 mm (3.4 inches)73%very high
July Weather25°C (77°F)129 mm (5.1 inches)65%very high
August Weather23°C (74°F)119 mm (4.7 inches)62%very high
September Weather20°C (68°F)117 mm (4.6 inches)66%very high
October Weather14°C (58°F)111 mm (4.4 inches)79%high
November Weather6°C (43°F)91 mm (3.6 inches)87%moderate
December Weather2°C (36°F)84 mm (3.3 inches)85%low

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