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September Weather in Junction, United States

Last updated: June 24, 2025

In September, the average temperature in Junction, United States is a pleasant 26°C (78°F). However, be prepared for a range, as temperatures can dip to a minimum of 8°C (47°F) and soar up to a scorching 38°C (101°F). Expect around 76 mm (3.0 in) of precipitation over 7 days, with an average humidity level of 66%, creating a warm and potentially humid atmosphere.

September Temperature in Junction

In September in Junction, the average temperature is 26°C (78°F). Maximums can reach 38°C (101°F), and minimums can be as low as 8°C (47°F). Be prepared for a wide range of temperatures, making it ideal for both outdoor activities and comfortable nights.

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 26°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec495262677581848478685853
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 76 mm (3.0 in) over a period of 7 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 76 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec3135625413744263676591929
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 66%. With an average temperature of 26°C (78°F), this humidity feels like a warm, sultry embrace that can be slightly stifling for traveling, making you crave cool breezes and shaded spots to relax and rehydrate.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111212121211965
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 Weather9°C (49°F)31 mm (1.2 inches)78%moderate
February Weather11°C (52°F)35 mm (1.4 inches)78%very high
March Weather17°C (62°F)62 mm (2.4 inches)77%very high
April Weather20°C (68°F)54 mm (2.1 inches)78%extreme
May Weather24°C (75°F)137 mm (5.4 inches)82%extreme
June Weather27°C (81°F)44 mm (1.7 inches)78%extreme
July Weather29°C (84°F)26 mm (1.0 inches)69%extreme
August Weather29°C (84°F)36 mm (1.4 inches)63%extreme
September Weather26°C (78°F)76 mm (3.0 inches)66%extreme
October Weather20°C (69°F)59 mm (2.3 inches)73%very high
November Weather14°C (58°F)19 mm (0.7 inches)84%high
December Weather11°C (53°F)29 mm (1.1 inches)87%moderate

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