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September Weather in Westerville, United States

Last updated: June 24, 2025

In Westerville, United States, the average temperature in September hovers around 20°C (69°F). Expect a minimum of 5°C (41°F) and a possible maximum of 34°C (94°F). With 86 mm (3.4 in) of precipitation spread over 8 days, the average humidity remains a comfortable 78%. Stay prepared for a mix of warm and cool days!

September Temperature in Westerville

In September in Westerville, the average temperature is 20°C (69°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 5°C (41°F). This makes Westerville a suitable destination for travelers looking to experience mild weather with the possibility of warmer days.

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

The chart illustrates September temperature patterns in Westerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westerville, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342516371757368574136
Data source: Temperature data for Westerville 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 Westerville

In Westerville in September, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 days.

September Precipitation Trends in Westerville

The chart displays monthly precipitation patterns in Westerville, 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 Westerville, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec781041051161241441117486999697
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Westerville

In Westerville in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Westerville

This chart illustrates the average monthly humidity levels in Westerville, 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 Westerville is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Westerville

In Westerville 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 Westerville.

Maximum UV Index Levels in Westerville for September

The chart shows the monthly maximum UV Index (UVI) for Westerville 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 Westerville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Westerville 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 Westerville Compares to Other Months

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

This table compares monthly weather conditions in Westerville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)78 mm (3.1 inches)88%moderate
February Weather1°C (34°F)104 mm (4.1 inches)87%moderate
March Weather5°C (42°F)105 mm (4.1 inches)87%high
April Weather11°C (52°F)116 mm (4.6 inches)87%very high
May Weather17°C (63°F)124 mm (4.9 inches)81%very high
June Weather22°C (72°F)144 mm (5.7 inches)82%very high
July Weather24°C (76°F)111 mm (4.4 inches)81%very high
August Weather23°C (73°F)74 mm (2.9 inches)78%very high
September Weather20°C (69°F)86 mm (3.4 inches)78%very high
October Weather14°C (58°F)99 mm (3.9 inches)82%high
November Weather5°C (42°F)96 mm (3.8 inches)89%moderate
December Weather2°C (36°F)97 mm (3.8 inches)86%moderate

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