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September Weather in Junction, United States

Last updated: June 24, 2025

In Junction, United States, the average temperature in September hovers around 16°C (61°F), with extremes ranging from a chilly -5°C (24°F) to a sweltering 33°C (91°F). You can expect an average precipitation amount of 17 mm (0.7 in) spread over about 4 days, and the air typically carries an average humidity of 47%.

September Temperature in Junction

In September in Junction, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as -5°C (24°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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

The chart illustrates September temperature patterns in Junction, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Junction, September typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (91°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec232532415266717061453725
Data source: Temperature data for Junction 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 Junction

In Junction in September, the precipitation amount is 17 mm (0.7 in) over a span of 4 days.

September Precipitation Trends in Junction

The chart displays monthly precipitation patterns in Junction, 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 Junction, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec41515236347232117282535
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Junction

In Junction in September, humidity is 47%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing breeze that adds a touch of crispness to your travels, making it comfortable for exploring outdoor attractions without too much heaviness in the air.

September Average Humidity in Junction

This chart illustrates the average monthly humidity levels in Junction, 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 Junction is approximately 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Junction

In Junction 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 Junction.

Maximum UV Index Levels in Junction for September

The chart shows the monthly maximum UV Index (UVI) for Junction 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 Junction typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121110764
Data source: Junction 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 Junction Compares to Other Months

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

This table compares monthly weather conditions in Junction, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)41 mm (1.6 inches)87%moderate
February Weather-4°C (25°F)51 mm (2.0 inches)88%high
March Weather0°C (32°F)52 mm (2.0 inches)77%very high
April Weather5°C (41°F)36 mm (1.4 inches)69%extreme
May Weather11°C (52°F)34 mm (1.3 inches)54%extreme
June Weather19°C (66°F)6 mm (0.3 inches)45%extreme
July Weather22°C (71°F)23 mm (0.9 inches)37%extreme
August Weather21°C (70°F)21 mm (0.8 inches)34%extreme
September Weather16°C (61°F)17 mm (0.7 inches)47%very high
October Weather7°C (45°F)28 mm (1.1 inches)67%high
November Weather3°C (37°F)25 mm (1.0 inches)82%high
December Weather-4°C (25°F)35 mm (1.4 inches)87%moderate

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