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September Weather in Tempe, United States

Last updated: June 24, 2025

In September, the average temperature in Tempe, United States reaches a warm 32°C (89°F), with a range that can dip to a cool 13°C (56°F) or soar up to a scorching 45°C (113°F). Expect a modest precipitation amount of 27 mm (1.1 in) over about 3 days, alongside an average humidity of 64% that adds a touch of warmth to the air.

September Temperature in Tempe

In September in Tempe, the average temperature is 32°C (89°F). Maximum temperatures can reach 45°C (113°F), while minimums can drop as low as 13°C (56°F). Travelers should be prepared for a wide range of temperatures and plan accordingly for both hot days and cooler evenings.

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

The chart illustrates September temperature patterns in Tempe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tempe, September typically has an average temperature of 32°C (89°F), with highs reaching up to 45°C (113°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec545764758292959489756555
Data source: Temperature data for Tempe 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 Tempe

In Tempe in September, the total precipitation amount is 27 mm (1.1 in) over the course of 3 days.

September Precipitation Trends in Tempe

The chart displays monthly precipitation patterns in Tempe, 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 Tempe, September typically receives around 27 mm (1.1 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec253729122373927262123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tempe

In Tempe in September, humidity is 64%. With an average temperature of 32°C (89°F), this humidity feels like a warm blanket enveloping you, making outdoor activities feel more strenuous and prompting travelers to seek shade or refreshment more frequently.

September Average Humidity in Tempe

This chart illustrates the average monthly humidity levels in Tempe, 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 Tempe 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 Tempe

In Tempe 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 Tempe.

Maximum UV Index Levels in Tempe for September

The chart shows the monthly maximum UV Index (UVI) for Tempe 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 Tempe typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110754
Data source: Tempe 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 Tempe Compares to Other Months

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

This table compares monthly weather conditions in Tempe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)25 mm (1.0 inches)76%moderate
February Weather14°C (57°F)37 mm (1.4 inches)79%high
March Weather18°C (65°F)29 mm (1.2 inches)67%very high
April Weather24°C (75°F)1 mm (0.1 inches)55%very high
May Weather28°C (82°F)2 mm (0.1 inches)40%extreme
June Weather34°C (93°F)2 mm (0.1 inches)33%extreme
July Weather35°C (95°F)37 mm (1.4 inches)34%extreme
August Weather35°C (95°F)39 mm (1.5 inches)48%extreme
September Weather32°C (89°F)27 mm (1.1 inches)64%very high
October Weather24°C (76°F)26 mm (1.0 inches)67%high
November Weather18°C (66°F)21 mm (0.8 inches)77%moderate
December Weather13°C (55°F)23 mm (0.9 inches)82%moderate

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