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September Weather in Apache Junction, United States

Last updated: June 24, 2025

In September, the average temperature in Apache Junction, United States is a warm 29°C (85°F). You can expect temperatures to range from a chilly 11°C (52°F) to a sizzling 43°C (109°F). With an average humidity of 64% and about 28 mm (1.1 in) of precipitation over 3 days, it's wise to be prepared for both heat and the occasional drizzle!

September Temperature in Apache Junction

In September in Apache Junction, the average temperature is 29°C (85°F), with maximums reaching up to 43°C (109°F) and minimums dropping as low as 11°C (52°F). Travelers should be prepared for hot days and cooler nights during this time.

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

The chart illustrates September temperature patterns in Apache Junction, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Apache Junction, September typically has an average temperature of 29°C (85°F), with highs reaching up to 43°C (109°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec515461717889919085726252
Data source: Temperature data for Apache 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 Apache Junction

In Apache Junction in September, the precipitation amount is 28 mm (1.1 in) over the course of 3 days.

September Precipitation Trends in Apache Junction

The chart displays monthly precipitation patterns in Apache 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 Apache Junction, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec435436333523328262735
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Apache Junction

In Apache Junction in September humidity is 64%. With an average temperature of 29°C (85°F), this humidity feels like a warm embrace, making travel both invigorating and slightly stifling, as the heat wraps around you and the air feels thick, urging you to seek shade and refreshing drinks.

September Average Humidity in Apache Junction

This chart illustrates the average monthly humidity levels in Apache 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 Apache Junction is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Apache Junction

In Apache 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 Apache Junction.

Maximum UV Index Levels in Apache Junction for September

The chart shows the monthly maximum UV Index (UVI) for Apache 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 Apache Junction typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110854
Data source: Apache 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 Apache Junction Compares to Other Months

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

This table compares monthly weather conditions in Apache Junction, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)43 mm (1.7 inches)76%moderate
February Weather12°C (54°F)54 mm (2.1 inches)79%high
March Weather16°C (61°F)36 mm (1.4 inches)67%very high
April Weather21°C (71°F)3 mm (0.1 inches)55%very high
May Weather26°C (78°F)3 mm (0.1 inches)40%extreme
June Weather32°C (89°F)3 mm (0.1 inches)33%extreme
July Weather33°C (91°F)52 mm (2.1 inches)34%extreme
August Weather32°C (90°F)33 mm (1.3 inches)48%extreme
September Weather29°C (85°F)28 mm (1.1 inches)64%very high
October Weather22°C (72°F)26 mm (1.0 inches)67%very high
November Weather17°C (63°F)26 mm (1.0 inches)77%moderate
December Weather11°C (52°F)35 mm (1.4 inches)82%moderate

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