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September Weather in Mountain City, United States

Last updated: June 24, 2025

In Mountain City, United States, the average temperature in September hovers around 18°C (65°F), with lows dipping to 3°C (38°F) and highs soaring to 29°C (85°F). Expect an average precipitation of 111 mm (4.4 in) spread across 11 days, contributing to a comfortable 68% humidity level. Enjoy the balance of warmth and moisture this season!

September Temperature in Mountain City

In September in Mountain City, the average temperature is 18°C (65°F). The maximum can reach 29°C (85°F) and the minimum can be as low as 3°C (38°F). This moderate climate makes Mountain City a great destination for travelers seeking pleasant weather.

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

The chart illustrates September temperature patterns in Mountain City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mountain City, September typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (85°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec354045526167716965564339
Data source: Temperature data for Mountain 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 Mountain City

In Mountain City in September, the precipitation amount is 111 mm (4.4 in), occurring over the course of 11 days.

September Precipitation Trends in Mountain City

The chart displays monthly precipitation patterns in Mountain 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 Mountain City, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec951421231441321319511911112879115
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mountain City

In Mountain City in September, humidity is 68%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel somewhat sticky and requiring occasional breaks for refreshing hydration.

September Average Humidity in Mountain City

This chart illustrates the average monthly humidity levels in Mountain 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 Mountain City is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mountain City

In Mountain City in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Mountain City.

Maximum UV Index Levels in Mountain City for September

The chart shows the monthly maximum UV Index (UVI) for Mountain 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 Mountain City typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111111111110863
Data source: Mountain 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 Mountain City Compares to Other Months

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

This table compares monthly weather conditions in Mountain City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)95 mm (3.7 inches)87%moderate
February Weather5°C (41°F)142 mm (5.6 inches)87%high
March Weather7°C (45°F)123 mm (4.8 inches)86%very high
April Weather11°C (52°F)144 mm (5.7 inches)84%extreme
May Weather16°C (61°F)132 mm (5.2 inches)83%extreme
June Weather19°C (67°F)130 mm (5.1 inches)83%extreme
July Weather22°C (71°F)95 mm (3.8 inches)79%extreme
August Weather21°C (69°F)119 mm (4.7 inches)66%extreme
September Weather18°C (65°F)111 mm (4.4 inches)68%very high
October Weather13°C (57°F)128 mm (5.0 inches)78%very high
November Weather6°C (43°F)79 mm (3.1 inches)89%high
December Weather4°C (39°F)115 mm (4.5 inches)86%moderate

Compare Mountain City's Climate with Cities Worldwide