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September Weather in Seymour, United States

Last updated: June 24, 2025

In Seymour, United States, the average temperature in September is a pleasant 21°C (69°F). You can expect a range from a cool minimum of 7°C (45°F) to a warm maximum of 33°C (92°F). The month typically sees about 125 mm (4.9 in) of precipitation spread over 8 days, contributing to an average humidity of 73%. Embrace the vibrant climate and plan accordingly!

September Temperature in Seymour

In September in Seymour, the average temperature is 21°C (69°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 7°C (45°F). This variety in temperatures makes Seymour a great destination for travelers seeking warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Seymour, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seymour, September typically has an average temperature of 21°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec252741506375787569544033
Data source: Temperature data for Seymour 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 Seymour

In Seymour in September, the precipitation amount is 125 mm (4.9 in) over the course of 8 days.

September Precipitation Trends in Seymour

The chart displays monthly precipitation patterns in Seymour, 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 Seymour, September typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4849987514512389781251335336
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seymour

In Seymour in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.

September Average Humidity in Seymour

This chart illustrates the average monthly humidity levels in Seymour, 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 Seymour is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seymour

In Seymour 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 Seymour.

Maximum UV Index Levels in Seymour for September

The chart shows the monthly maximum UV Index (UVI) for Seymour 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 Seymour typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Seymour 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 Seymour Compares to Other Months

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

This table compares monthly weather conditions in Seymour, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)48 mm (1.9 inches)78%moderate
February Weather-3°C (27°F)49 mm (1.9 inches)80%moderate
March Weather5°C (42°F)98 mm (3.9 inches)77%high
April Weather10°C (51°F)75 mm (3.0 inches)77%very high
May Weather17°C (64°F)145 mm (5.7 inches)77%very high
June Weather24°C (75°F)122 mm (4.8 inches)81%extreme
July Weather26°C (78°F)89 mm (3.5 inches)81%very high
August Weather24°C (75°F)78 mm (3.1 inches)77%very high
September Weather21°C (69°F)125 mm (4.9 inches)73%very high
October Weather12°C (54°F)132 mm (5.2 inches)75%high
November Weather4°C (40°F)53 mm (2.1 inches)85%moderate
December Weather0°C (33°F)35 mm (1.4 inches)83%moderate

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