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September Weather in Jefferson City, United States

Last updated: June 24, 2025

In September, the average temperature in Jefferson City, United States hovers around 22°C (73°F), with a minimum dipping to 7°C (45°F) and highs reaching up to 35°C (96°F). Be prepared for some rain, as the area experiences approximately 56 mm (2.2 in) of precipitation spread over 6 days. Additionally, the average humidity level is a comfortable 76%, making for a pleasant climate overall.

September Temperature in Jefferson City

In September in Jefferson City, the average temperature is 22°C (73°F). Maximums can reach 35°C (96°F), while minimums can dip as low as 7°C (45°F). This makes Jefferson City an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Jefferson City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson City, September typically has an average temperature of 22°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec333647556676807672584539
Data source: Temperature data for Jefferson City 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 City

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

September Precipitation Trends in Jefferson City

The chart displays monthly precipitation patterns in Jefferson City, 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 City, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec7065120124163951099456995942
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jefferson City

In Jefferson City in September, humidity is 76%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace that envelops you, making travel both refreshing and slightly steamy, as the air clings warmly to your skin.

September Average Humidity in Jefferson City

This chart illustrates the average monthly humidity levels in Jefferson City, 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 City is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jefferson City

In Jefferson City 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 Jefferson City.

Maximum UV Index Levels in Jefferson City for September

The chart shows the monthly maximum UV Index (UVI) for Jefferson City 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 City typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109753
Data source: Jefferson City 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 City Compares to Other Months

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

This table compares monthly weather conditions in Jefferson City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)70 mm (2.8 inches)82%moderate
February Weather2°C (36°F)65 mm (2.6 inches)80%moderate
March Weather9°C (48°F)120 mm (4.7 inches)80%high
April Weather13°C (55°F)124 mm (4.9 inches)80%very high
May Weather19°C (67°F)163 mm (6.4 inches)82%very high
June Weather25°C (77°F)95 mm (3.7 inches)83%extreme
July Weather26°C (80°F)108 mm (4.3 inches)81%extreme
August Weather25°C (77°F)94 mm (3.7 inches)80%very high
September Weather22°C (73°F)56 mm (2.2 inches)76%very high
October Weather15°C (59°F)99 mm (3.9 inches)76%high
November Weather7°C (45°F)59 mm (2.3 inches)85%moderate
December Weather4°C (40°F)41 mm (1.6 inches)86%moderate

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