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September Weather in Maryville, United States

Last updated: June 24, 2025

In Maryville, United States, the average temperature in September hovers around 21°C (70°F), making it a pleasantly warm time of year. However, be prepared for temperature fluctuations, as it can dip to a minimum of 6°C (43°F) and soar to a maximum of 34°C (94°F). You'll also want to pack an umbrella, as 117 mm (4.6 in) of precipitation is expected over 9 days during the month, while the average humidity sits at a comfortable 73%.

September Temperature in Maryville

In September in Maryville, the average temperature is 21°C (70°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 6°C (43°F). This varied climate makes it an ideal destination for travelers looking to experience a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Maryville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Maryville, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec272943526476787570544134
Data source: Temperature data for Maryville 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 Maryville

In Maryville in September, the total precipitation amount is 117 mm (4.6 in) spread over a period of 9 days.

September Precipitation Trends in Maryville

The chart displays monthly precipitation patterns in Maryville, 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 Maryville, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec423296851681421181081171464337
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Maryville

In Maryville in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Maryville

This chart illustrates the average monthly humidity levels in Maryville, 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 Maryville 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 Maryville

In Maryville 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 Maryville.

Maximum UV Index Levels in Maryville for September

The chart shows the monthly maximum UV Index (UVI) for Maryville 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 Maryville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111099643
Data source: Maryville 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 Maryville Compares to Other Months

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

This table compares monthly weather conditions in Maryville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)42 mm (1.7 inches)78%moderate
February Weather-2°C (29°F)32 mm (1.3 inches)80%moderate
March Weather6°C (44°F)96 mm (3.8 inches)77%high
April Weather11°C (52°F)85 mm (3.3 inches)77%very high
May Weather18°C (65°F)168 mm (6.6 inches)77%very high
June Weather25°C (76°F)142 mm (5.6 inches)81%extreme
July Weather26°C (79°F)118 mm (4.6 inches)81%very high
August Weather24°C (76°F)108 mm (4.2 inches)77%very high
September Weather21°C (70°F)117 mm (4.6 inches)73%very high
October Weather12°C (55°F)146 mm (5.7 inches)75%high
November Weather5°C (42°F)43 mm (1.7 inches)85%moderate
December Weather1°C (34°F)36 mm (1.4 inches)83%moderate

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