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September Weather in Seneca, United States

Last updated: June 24, 2025

In September, the average temperature in Seneca, United States reaches a pleasant 20°C (69°F). However, you may experience a range of conditions, with minimums dipping to 4°C (39°F) and maximums soaring to 35°C (95°F). Expect approximately 91 mm (3.6 in) of precipitation spread over about 10 days, accompanied by an average humidity of 80%, adding to the overall atmosphere of the month.

September Temperature in Seneca

In September in Seneca, the average temperature is 20°C (69°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 4°C (39°F). This climate makes Seneca an ideal destination for travelers seeking a pleasant mix of warmth and cooler evenings.

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

The chart illustrates September temperature patterns in Seneca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seneca, September typically has an average temperature of 20°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec262841506373767369554034
Data source: Temperature data for Seneca 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 Seneca

In Seneca in September, the precipitation amount totals 91 mm (3.6 in) over a span of 10 days.

September Precipitation Trends in Seneca

The chart displays monthly precipitation patterns in Seneca, 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 Seneca, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec64689311916514310193911365856
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seneca

In Seneca in September, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

September Average Humidity in Seneca

This chart illustrates the average monthly humidity levels in Seneca, 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 Seneca is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seneca

In Seneca 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 Seneca.

Maximum UV Index Levels in Seneca for September

The chart shows the monthly maximum UV Index (UVI) for Seneca 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 Seneca typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Seneca 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 Seneca Compares to Other Months

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

This table compares monthly weather conditions in Seneca, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)64 mm (2.5 inches)82%moderate
February Weather-2°C (28°F)68 mm (2.7 inches)83%moderate
March Weather5°C (41°F)93 mm (3.7 inches)84%high
April Weather10°C (50°F)119 mm (4.7 inches)85%very high
May Weather17°C (63°F)165 mm (6.5 inches)79%very high
June Weather23°C (73°F)143 mm (5.6 inches)82%very high
July Weather24°C (76°F)101 mm (4.0 inches)80%very high
August Weather23°C (74°F)93 mm (3.6 inches)81%very high
September Weather20°C (69°F)91 mm (3.6 inches)80%very high
October Weather13°C (56°F)136 mm (5.4 inches)82%high
November Weather4°C (40°F)58 mm (2.3 inches)88%moderate
December Weather1°C (34°F)56 mm (2.2 inches)84%low

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