September weather forecast
Arizona, USA

September in Arizona heralds the beginning of a shift from the stifling summer heat towards the more temperate conditions of autumn. The month is marked by a steady decline in temperatures, making it progressively more comfortable, especially in the latter half.

The southern desert expanses, such as Phoenix, start to experience some relief from the relentless summer heat. Daytime temperatures in this region typically fluctuate from 90°F (32.2°C) to 100°F (37.8°C). Nights provide a more noticeable respite, with temperatures comfortably settling between 70°F (21.1°C) and 80°F (26.7°C). Monsoonal activities from the preceding months begin to wane, but occasional rain showers can still occur, especially in the early part of September.

In contrast, the northern highland areas like Flagstaff already start feeling the autumn chill. Day temperatures here generally vary from 70°F (21.1°C) to 80°F (26.7°C). Nights, however, can be crisp, with temperatures ranging from 45°F (7.2°C) to 55°F (12.8°C). Rainfall becomes sporadic, and the landscape starts to show hints of the upcoming fall colors.

Compared to the peak heat and monsoonal patterns of August, September is relatively calm and transitional. The month’s progression sees a continuous reduction in temperatures, paving the way for the more consistent autumnal weather of October in Arizona.

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• Phoenix - September »
  The month with the most snowfall in Phoenix is September, when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow. In Phoenix in September, during 4.7 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.
• Tucson - September »
  In Tucson in September, it is raining for 8.6 days, with typically 0.98" (25mm) of accumulated precipitation. September in Tucson marks the ornate transition from summer to fall, resulting in a noticeable decrease in humidity.
• Mesa - September »
  In Mesa in September, during 7.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Mesa, during September, the rain falls for 7.4 days and regularly aggregates up to 0.79" (20mm) of precipitation.
• Chandler - September »
  September ushers in a minute temperature change in Chandler with average high-temperatures reducing from August's sweltering 101.3°F (38.5°C) to a still torrid 95.9°F (35.5°C). In September, in Chandler, the rain falls for 7.7 days.
• Scottsdale - September »
  In Scottsdale, during September, the rain falls for 7.3 days and regularly aggregates up to 0.94" (24mm) of precipitation. On the last day of September, in Scottsdale, sunrise is at 6:21 am and sunset at 6:13 pm MST.
• Glendale - September »
  On the first day of September in Glendale sunrise is at 6:02 am and sunset at 6:54 pm. In Glendale in September, it is raining for 6.7 days, with typically 1.1" (28mm) of accumulated precipitation.
• Gilbert - September »
  In Gilbert in September, during 7.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Gilbert, Arizona, in September, it is raining for 7.4 days, with typically 0.79" (20mm) of accumulated precipitation.
• Tempe - September »
  In Tempe, Arizona, during September, the rain falls for 7.3 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the month of September, Tempe sees a steady low-temperature average of 77.9°F (25.5°C).
• Peoria - September »
  On the first day of September in Peoria, Arizona, sunrise is at 6:02 am and sunset at 6:54 pm. In Peoria during September, the rain falls for 6.7 days and regularly aggregates up to 1.1" (28mm) of precipitation.
• Surprise - September »
  On the last day of September, in Surprise, sunrise is at 6:23 am and sunset at 6:15 pm MST. In Surprise, in September, during 7.1 rainfall days, 1.18" (30mm) of precipitation is typically accumulated.
• Yuma - September »
  On the first day of September in Yuma, sunrise is at 6:13 am and sunset at 7:03 pm. With an impressive average 9.8 hours of sunshine daily, September in Yuma is a blend of receding heat and the incoming spirit of fall.