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September Weather in Sewickley Hills, United States

Last updated: June 24, 2025

In September, the average temperature in Sewickley Hills, United States hovers around 20°C (68°F). Expect a range, with minimums dipping to 5°C (41°F) and maximums soaring to 34°C (94°F). Rainfall is moderate, with 122 mm (4.8 in) expected over about 9 days, contributing to an average humidity of 77%.

September Temperature in Sewickley Hills

In September in Sewickley Hills, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (94°F) and minimums can drop as low as 5°C (41°F). This varied climate makes it a great time for travelers to experience both warm days and cooler evenings, perfect for outdoor activities and exploration.

September Weather in Sewickley Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sewickley Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sewickley Hills, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec313541516270757368574236
Data source: Temperature data for Sewickley Hills 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 Sewickley Hills

In Sewickley Hills in September, the precipitation amount is 122 mm (4.8 in) over a span of 9 days.

September Precipitation Trends in Sewickley Hills

The chart displays monthly precipitation patterns in Sewickley Hills, 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 Sewickley Hills, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec92118104130136137137821221249299
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sewickley Hills

In Sewickley Hills in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

September Average Humidity in Sewickley Hills

This chart illustrates the average monthly humidity levels in Sewickley Hills, 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 Sewickley Hills is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sewickley Hills

In Sewickley Hills 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 Sewickley Hills.

Maximum UV Index Levels in Sewickley Hills for September

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

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

This table compares monthly weather conditions in Sewickley Hills, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)92 mm (3.6 inches)88%moderate
February Weather1°C (35°F)118 mm (4.6 inches)88%moderate
March Weather5°C (42°F)104 mm (4.1 inches)87%high
April Weather11°C (52°F)130 mm (5.1 inches)87%very high
May Weather17°C (63°F)136 mm (5.4 inches)81%very high
June Weather21°C (70°F)137 mm (5.4 inches)83%very high
July Weather24°C (75°F)137 mm (5.4 inches)82%very high
August Weather23°C (73°F)82 mm (3.2 inches)76%very high
September Weather20°C (68°F)122 mm (4.8 inches)77%very high
October Weather14°C (57°F)123 mm (4.9 inches)82%high
November Weather6°C (42°F)92 mm (3.6 inches)89%moderate
December Weather2°C (36°F)99 mm (3.9 inches)86%low

Compare Sewickley Hills's Climate with Cities Worldwide