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September Weather in Johnson City, United States

Last updated: June 24, 2025

In September, the average temperature in Johnson City, United States is a pleasant 17°C (64°F). Expect a minimum chill of 0°C (32°F) and a warm peak of up to 32°C (90°F). With about 95 mm (3.7 in) of precipitation over 8 days, it's a month that features a mix of sun and rain. The average humidity sits comfortably at 66%, adding a touch of moisture to the air.

September Temperature in Johnson City

In September in Johnson City, the average temperature is 17°C (64°F). The maximum can reach 32°C (90°F), while the minimum can drop as low as 0°C (32°F). This range makes it an ideal time for travelers to experience a blend of warm and cooler weather, perfect for outdoor activities and city exploration.

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

The chart illustrates September temperature patterns in Johnson City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnson City, September typically has an average temperature of 17°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec262935465867727063543932
Data source: Temperature data for Johnson 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 Johnson City

In Johnson City in September, the total precipitation amount is 95 mm (3.7 in) spread over 8 days.

September Precipitation Trends in Johnson City

The chart displays monthly precipitation patterns in Johnson 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 Johnson City, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec738989120131103121108951359288
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Johnson City

In Johnson City in September, humidity is 66%. With an average temperature of 17°C (64°F), this humidity feels like a gentle embrace, making it quite comfortable for traveling as long as you stay hydrated and wear light clothing.

September Average Humidity in Johnson City

This chart illustrates the average monthly humidity levels in Johnson 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 Johnson City is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Johnson City

In Johnson City 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 Johnson City.

Maximum UV Index Levels in Johnson City for September

The chart shows the monthly maximum UV Index (UVI) for Johnson 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 Johnson City typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346910101098642
Data source: Johnson 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 Johnson City Compares to Other Months

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

This table compares monthly weather conditions in Johnson City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)73 mm (2.9 inches)87%moderate
February Weather-2°C (29°F)89 mm (3.5 inches)85%moderate
March Weather2°C (35°F)89 mm (3.5 inches)85%high
April Weather8°C (47°F)120 mm (4.7 inches)83%very high
May Weather14°C (58°F)131 mm (5.1 inches)75%very high
June Weather19°C (67°F)103 mm (4.1 inches)73%very high
July Weather22°C (72°F)121 mm (4.8 inches)65%very high
August Weather21°C (70°F)108 mm (4.2 inches)62%very high
September Weather17°C (64°F)95 mm (3.7 inches)66%very high
October Weather12°C (54°F)135 mm (5.3 inches)79%high
November Weather4°C (39°F)92 mm (3.6 inches)87%moderate
December Weather0°C (32°F)88 mm (3.5 inches)85%low

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