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September Weather in Seneca, United States

Last updated: June 24, 2025

In September, the average temperature in Seneca, United States hovers around 22°C (71°F). During this month, temperatures can range from a minimum of 6°C (43°F) to a maximum of 35°C (96°F). Expect about 71 mm (2.8 in) of precipitation over the course of 7 days, with an average humidity level of 71%.

September Temperature in Seneca

In September in Seneca, the average temperature is 22°C (71°F). Maximums can reach 35°C (96°F) and minimums can be as low as 6°C (43°F). This variability in temperatures makes it essential for travelers to pack both lightweight clothing for the warm days and warmer layers for the cooler nights.

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 22°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec293044536477797671554336
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 is 71 mm (2.8 in) over a span of 7 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 71 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec3431968421010072124711233729
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 71%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring plenty of hydration to stay comfortable while exploring.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-2°C (29°F)34 mm (1.3 inches)76%moderate
February Weather-1°C (30°F)31 mm (1.2 inches)77%moderate
March Weather7°C (45°F)96 mm (3.8 inches)70%high
April Weather11°C (53°F)84 mm (3.3 inches)73%very high
May Weather18°C (65°F)210 mm (8.3 inches)82%very high
June Weather25°C (77°F)100 mm (3.9 inches)82%extreme
July Weather26°C (80°F)72 mm (2.8 inches)81%extreme
August Weather24°C (76°F)124 mm (4.9 inches)78%very high
September Weather22°C (71°F)71 mm (2.8 inches)71%very high
October Weather13°C (55°F)123 mm (4.8 inches)71%high
November Weather6°C (43°F)37 mm (1.4 inches)81%moderate
December Weather2°C (36°F)29 mm (1.1 inches)84%moderate

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