September weather forecast
Prescott, AZ

Beautiful sunset above the calm Watson Lake in the Granite Dells of Prescott, Arizona
Beautiful sunset above the calm Watson Lake in the Granite Dells of Prescott, Arizona

Weather in September

The first month of the autumn, September, is still a warm month in Prescott, Arizona, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 59°F (15°C).

Temperature

In September, the average high-temperature slightly decreases, from 85.1°F (29.5°C) in August, to a still warm 79.7°F (26.5°C). The average low-temperature, in September, is 59°F (15°C).

Humidity

The average relative humidity in Prescott is 42%.

Rainfall

In Prescott, during September, the rain falls for 9.8 days and regularly aggregates up to 1.69" (43mm) of precipitation. In Prescott, during the entire year, the rain falls for 76.9 days and collects up to 16.46" (418mm) of precipitation.

Snowfall

In Prescott snow does not fall in May through October.

Daylight

In Prescott, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine in Prescott is 9.8h.

UV index

In Prescott, Arizona, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Prescott?

In Prescott, the average relative humidity in September is 42%.

How many days does it rain in September in Prescott?

In Prescott, Arizona, in September, during 9.8 rainfall days, 1.69" (43mm) of precipitation is typically accumulated.

When it does not snow in Prescott?

May through October are months without snowfall.

What is the average length of the day in September in Prescott?

In September, the average length of the day is 12.4h.

How many hours of sunshine does Prescott have in September?

In September, the average sunshine is 9.8h.

What is the UV index intensity in September in Prescott?

The average daily maximum UV index in September in Prescott is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Prescott, AZ

Average temperature in September - Prescott, AZ
  • Average high temperature in September: 26.5°C

The warmest month (with the highest average high temperature) is July (30.7°C).
The month with the lowest average high temperature is December (9.5°C).

  • Average low temperature in September: 15°C

The month with the highest average low temperature is July (18.4°C).
The coldest month (with the lowest average low temperature) is December (-0.7°C).

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Average pressure in September
Prescott, AZ

Average pressure in September - Prescott, AZ
  • Average pressure in September: 1012.4mbar

The month with the highest atmospheric pressure is January (1019.9mbar).
The month with the lowest atmospheric pressure is June (1010.1mbar).

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Average wind speed in September
Prescott, AZ

Average wind speed in September - Prescott, AZ
  • Average wind speed in September: 9.3km/h

The windiest month (with the highest average wind speed) is April (13.4km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).

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Average humidity in September
Prescott, AZ

Average humidity in September - Prescott, AZ
  • Average humidity in September: 42%

The month with the highest relative humidity is December (58%).
The month with the lowest relative humidity is June (23%).

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Average rainfall in September
Prescott, AZ

Average rainfall in September - Prescott, AZ
  • Average rainfall in September: 43mm

The wettest month (with the highest rainfall) is July (110mm).
The driest month (with the least rainfall) is June (6mm).

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Average rainfall days in September
Prescott, AZ

Average rainfall days in September - Prescott, AZ
  • Average rainfall days in September: 9.8 days

Months with the highest number of rainy days are July and August (15.5 days).
The month with the least rainy days is June (2.3 days).

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Average snowfall in September
Prescott, AZ

Average snowfall in September - Prescott, AZ
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (105mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
Prescott, AZ

Average snowfall days in September - Prescott, AZ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (3.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Prescott, AZ

Average daylight in September / Average sunshine in September - Prescott, 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: 9.9h).

  • Average sunshine in September: 9.8h

The month with the most sunshine is June (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Prescott, AZ

Average sunshine days in September - Prescott, AZ
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is May (26.8 days).
The month with the least sunshine days is August (12.8 days).

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Average UV index in September
Prescott, AZ

Average UV index in September - Prescott, AZ
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Prescott, AZ

Average cloud cover in September - Prescott, AZ
  • Average cloud cover in September: 10

The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 7).

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Average visibility in September
Prescott, AZ

Average visibility in September - Prescott, AZ
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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