September weather forecast and climate
Fountain Hills, AZ

Weather in September

The first month of the autumn, September, is still a hot month in Fountain Hills, Arizona, with average temperature varying between 74.7°F (23.7°C) and 92.5°F (33.6°C).

Temperature

In Fountain Hills, the average high-temperature in September slightly decreases, from a sweltering 98.2°F (36.8°C) in August, to a tropical 92.5°F (33.6°C). In September, in Fountain Hills, the average low-temperature is 74.7°F (23.7°C).

Humidity

In Fountain Hills, the average relative humidity is 32%.

Rainfall

In Fountain Hills, it is raining for 8.2 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, in Fountain Hills, there are 67.9 rainfall days, and 10" (254mm) of precipitation is accumulated.

Daylight

The average length of the day in Fountain Hills is 12.4h.

Sunshine

In September, the average sunshine in Fountain Hills is 9.6h.

UV index

The average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Fountain Hills?

In Fountain Hills, the average relative humidity in September is 32%.

How much does it rain in Fountain Hills in September?

In Fountain Hills, Arizona, during September, the rain falls for 8.2 days and regularly aggregates up to 1.06" (27mm) of precipitation.

How many hours of daylight does Fountain Hills have in September?

In September, the average length of the day in Fountain Hills, Arizona, is 12.4h.

How long on average sun shines in September in Fountain Hills?

In September, the average sunshine is 9.6h.

What is the UV index intensity in September in Fountain Hills?

In Fountain Hills, Arizona, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.

Average temperature in September
Fountain Hills, AZ

Average temperature in September - Fountain Hills, AZ
  • Average high temperature in September: 92.5°F

The warmest month (with the highest average high temperature) is July (99.1°F).
The month with the lowest average high temperature is December (60.3°F).

  • Average low temperature in September: 74.7°F

The month with the highest average low temperature is August (80.4°F).
The coldest month (with the lowest average low temperature) is December (44.2°F).

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Average pressure in September
Fountain Hills, AZ

Average pressure in September - Fountain Hills, AZ
  • Average pressure in September: 29.89"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed in September
Fountain Hills, AZ

Average wind speed in September - Fountain Hills, AZ
  • Average wind speed in September: 5.3mph

The windiest months (with the highest average wind speed) are April and May (6.5mph).
The calmest month (with the lowest average wind speed) is December (4.8mph).

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Average humidity in September
Fountain Hills, AZ

Average humidity in September - Fountain Hills, AZ
  • Average humidity in September: 32%

The month with the highest relative humidity is December (46%).
The month with the lowest relative humidity is June (17%).

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Average rainfall in September
Fountain Hills, AZ

Average rainfall in September - Fountain Hills, AZ
  • Average rainfall in September: 1.06"

The wettest month (with the highest rainfall) is July (1.54").
The driest months (with the least rainfall) are May and June (0.12").

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Average rainfall days in September
Fountain Hills, AZ

Average rainfall days in September - Fountain Hills, AZ
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is July (12.2 days).
The month with the least rainy days is June (1.6 days).

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Average daylight in September /
Average sunshine in September
Fountain Hills, AZ

Average daylight in September / Average sunshine in September - Fountain Hills, AZ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9.6h

The month with the most sunshine is June (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in September
Fountain Hills, AZ

Average sunshine days in September - Fountain Hills, AZ
  • Average sunshine days in September: 18.8 days

The month with the most sunshine days is May (28 days).
The month with the least sunshine days is July (14 days).

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Average UV index in September
Fountain Hills, AZ

Average UV index in September - Fountain Hills, AZ
  • Average UV index in September: 7

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Fountain Hills, AZ

Average cloud cover in September - Fountain Hills, AZ
  • Average cloud cover in September: 11

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 6).

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Average visibility in September
Fountain Hills, AZ

Average visibility in September - Fountain Hills, AZ
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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