September Weather in Fountain Hills, United States

Last updated: June 24, 2025

In September, the average temperature in Fountain Hills, United States reaches a warm 31°C (88°F). However, temperatures can vary significantly, with a minimum of 12°C (54°F) and a sweltering maximum of 44°C (112°F). Visitors can expect about 28 mm (1.1 in) of precipitation over 3 days, accompanied by an average humidity level of 64%.

September Temperature in Fountain Hills

In September in Fountain Hills, the average temperature is 31°C (88°F), with maximums reaching up to 44°C (112°F) and minimums dropping as low as 12°C (54°F). Travelers should be prepared for a wide range of temperatures and plan accordingly for both hot days and cooler nights.

September Weather in Fountain Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fountain Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fountain Hills, September typically has an average temperature of 31°C (88°F), with highs reaching up to 44°C (112°F) and lows dropping to around 12°C (54°F).

Data source: Temperature data for Fountain Hills generated using information from the Copernicus Climate Change Service.

September Precipitation in Fountain Hills

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

September Precipitation Trends in Fountain Hills

The chart displays monthly precipitation patterns in Fountain Hills, 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 Fountain Hills, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Fountain Hills

In Fountain Hills in September humidity is 64%. With an average temperature of 31°C (88°F), this humidity feels like a warm, enveloping blanket, making outdoor activities more challenging and creating a thirst for refreshing drinks as you navigate the sights.

September Average Humidity in Fountain Hills

This chart illustrates the average monthly humidity levels in Fountain Hills, 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 Fountain Hills is approximately 64%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fountain Hills

In Fountain Hills 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 Fountain Hills.

Maximum UV Index Levels in Fountain Hills for September

The chart shows the monthly maximum UV Index (UVI) for Fountain Hills 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 Fountain Hills typically reaches 10, which falls under the very high exposure category.

Data source: Fountain Hills 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 Fountain Hills Compares to Other Months

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

This table compares monthly weather conditions in Fountain Hills, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	33 mm (1.3 inches)	76%	moderate
February Weather	13°C (56°F)	44 mm (1.7 inches)	79%	high
March Weather	17°C (63°F)	31 mm (1.2 inches)	67%	very high
April Weather	23°C (74°F)	2 mm (0.1 inches)	55%	very high
May Weather	27°C (81°F)	2 mm (0.1 inches)	40%	extreme
June Weather	33°C (92°F)	2 mm (0.1 inches)	33%	extreme
July Weather	34°C (94°F)	38 mm (1.5 inches)	34%	extreme
August Weather	34°C (93°F)	33 mm (1.3 inches)	48%	extreme
September Weather	31°C (88°F)	28 mm (1.1 inches)	64%	very high
October Weather	24°C (75°F)	25 mm (1.0 inches)	67%	very high
November Weather	18°C (65°F)	23 mm (0.9 inches)	77%	moderate
December Weather	12°C (54°F)	27 mm (1.0 inches)	82%	moderate