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September Weather in Jefferson, United States

Last updated: June 24, 2025

In September, the average temperature in Jefferson, United States hovers around 19°C (66°F). Expect a minimum plunge to 6°C (42°F) and a peak reaching up to 32°C (90°F). With an average humidity of 77%, this month typically brings about 92 mm (3.6 in) of precipitation spread over 10 days. Prepare for a blend of warmth and occasional rain during your stay!

September Temperature in Jefferson

In September in Jefferson, the average temperature is 19°C (66°F). The maximum can reach 32°C (90°F), while the minimum can drop to as low as 6°C (42°F). This diverse temperature range makes Jefferson an ideal destination for travelers seeking both warm afternoons and cool evenings.

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 19°C (66°F), with highs reaching up to 32°C (90°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec293137475968737166564134
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 total precipitation amount is 92 mm (3.6 in), which falls over the course of 10 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 92 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec91949711412812314510192128108103
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 77%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and sticky, which can be quite uncomfortable for traveling.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
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 Weather-2°C (29°F)91 mm (3.6 inches)88%moderate
February Weather-1°C (31°F)94 mm (3.7 inches)88%moderate
March Weather3°C (38°F)97 mm (3.8 inches)87%high
April Weather8°C (47°F)114 mm (4.5 inches)87%very high
May Weather15°C (59°F)128 mm (5.0 inches)81%very high
June Weather20°C (68°F)123 mm (4.8 inches)83%very high
July Weather23°C (73°F)145 mm (5.7 inches)82%very high
August Weather22°C (71°F)101 mm (4.0 inches)76%very high
September Weather19°C (66°F)92 mm (3.6 inches)77%very high
October Weather13°C (56°F)127 mm (5.0 inches)82%high
November Weather5°C (41°F)108 mm (4.2 inches)89%moderate
December Weather1°C (35°F)103 mm (4.1 inches)86%low

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