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September Weather in Jefferson, United States

Last updated: June 24, 2025

In Jefferson, United States, the average temperature in September hovers around 18°C (65°F), with a comfortable range where it can dip to a minimum of 5°C (41°F) or soar up to a maximum of 36°C (97°F). Expect an average precipitation of 56 mm (2.2 in) over approximately 6 days, accompanied by a relatively high humidity level of 71%.

September Temperature in Jefferson

In September in Jefferson, the average temperature is 18°C (65°F). Maximums can reach 36°C (97°F), and minimums can drop as low as 5°C (41°F). It's advisable to pack for both warm and cooler conditions while exploring this destination.

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

The chart illustrates September temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, September typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec434246525864707165544742
Data source: Temperature data for Jefferson 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 Jefferson

In Jefferson in September, the precipitation amount is 56 mm (2.2 in) spread over 6 days.

September Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, 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 Jefferson, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1371681191075335245682123174
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jefferson

In Jefferson in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

September Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, 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 Jefferson is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jefferson

In Jefferson in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Jefferson.

Maximum UV Index Levels in Jefferson for September

The chart shows the monthly maximum UV Index (UVI) for Jefferson 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 Jefferson typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23679101097532
Data source: Jefferson 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 Jefferson Compares to Other Months

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

This table compares monthly weather conditions in Jefferson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)137 mm (5.4 inches)85%low
February Weather6°C (42°F)168 mm (6.6 inches)84%moderate
March Weather8°C (47°F)119 mm (4.7 inches)85%high
April Weather11°C (52°F)107 mm (4.2 inches)83%high
May Weather14°C (58°F)53 mm (2.1 inches)83%very high
June Weather18°C (65°F)35 mm (1.4 inches)83%very high
July Weather21°C (71°F)2 mm (0.1 inches)82%very high
August Weather22°C (71°F)4 mm (0.2 inches)74%very high
September Weather18°C (65°F)56 mm (2.2 inches)71%high
October Weather12°C (54°F)82 mm (3.2 inches)81%moderate
November Weather8°C (48°F)123 mm (4.9 inches)87%moderate
December Weather6°C (42°F)174 mm (6.8 inches)87%low

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