September weather forecast and climate
Mammoth, AZ

Weather in September

The first month of the autumn, September, is still a tropical month in Mammoth, Arizona, with temperature in the range of an average high of 86.9°F (30.5°C) and an average low of 68.4°F (20.2°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still hot 86.9°F (30.5°C). In Mammoth, the average low-temperature is 68.4°F (20.2°C).

Heat index

The average heat index is appraised at a tropical 86.7°F (30.4°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like clothing, pregnancy, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Mammoth, the average relative humidity is 41%.

Rainfall

In Mammoth, Arizona, during September, the rain falls for 10.2 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, in Mammoth, there are 80.2 rainfall days, and 10.16" (258mm) of precipitation is accumulated.

Snowfall

March through December are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine in Mammoth, Arizona, is 9.9h.

UV index

The average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
[Resources]

FAQ

What is the temperature in September in Mammoth?

In Mammoth, Arizona, in September, the average high-temperature is 86.9°F (30.5°C), and the average low-temperature is 68.4°F (20.2°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is estimated at 86.7°F (30.4°C).

What is the average humidity in September in Mammoth?

The average relative humidity in September in Mammoth, Arizona, is 41%.

How many days does it rain in September in Mammoth?

In September, the rain falls for 10.2 days. Throughout September, 1.46" (37mm) of precipitation is accumulated.

When it does not snow in Mammoth?

March through December are months without snowfall in Mammoth, Arizona.

How many hours of daylight does Mammoth have in September?

The average length of the day in September in Mammoth, Arizona, is 12.4h.

How long on average sun shines in September in Mammoth?

The average sunshine in September is 9.9h.

What is the UV index intensity in September in Mammoth?

The average daily maximum UV index in September in Mammoth, Arizona, is 6. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Mammoth, AZ

Average temperature in September - Mammoth, AZ
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is June (93.9°F).
The month with the lowest average high temperature is December (58.1°F).

  • Average low temperature in September: 68.4°F

The month with the highest average low temperature is July (74.8°F).
The coldest month (with the lowest average low temperature) is January (39.7°F).

[Resources]

Average pressure in September
Mammoth, AZ

Average pressure in September - Mammoth, AZ
  • Average pressure in September: 29.91"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.85").

[Resources]

Average wind speed in September
Mammoth, AZ

Average wind speed in September - Mammoth, AZ
  • Average wind speed in September: 5.5mph

The windiest months (with the highest average wind speed) are April and May (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

[Resources]

Average humidity in September
Mammoth, AZ

Average humidity in September - Mammoth, AZ
  • Average humidity in September: 41%

The month with the highest relative humidity is December (50%).
The month with the lowest relative humidity is June (20%).

[Resources]

Average rainfall in September
Mammoth, AZ

Average rainfall in September - Mammoth, AZ
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is July (1.97").
The driest months (with the least rainfall) are May and June (0.12").

[Resources]

Average rainfall days in September
Mammoth, AZ

Average rainfall days in September - Mammoth, AZ
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is May (2 days).

[Resources]

Average snowfall in September
Mammoth, AZ

Average snowfall in September - Mammoth, AZ
  • Average snowfall in September: 0"

Months with the highest snowfall are January and February (0.04").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

[Resources]

Average snowfall days in September
Mammoth, AZ

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

The month with the highest number of snowfall days is January (0.3 days).
Months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.9h).

[Resources]

Average sunshine days in September
Mammoth, AZ

Average sunshine days in September - Mammoth, AZ
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is May (28.7 days).
The month with the least sunshine days is July (10 days).

[Resources]

Average UV index in September
Mammoth, AZ

Average UV index in September - Mammoth, AZ
  • Average UV index in September: 6

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are November and December (UV index 3).

[Resources]

Average cloud cover in September
Mammoth, AZ

Average cloud cover in September - Mammoth, AZ
  • Average cloud cover in September: 13

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 7).

[Resources]

Average visibility in September
Mammoth, AZ

Average visibility in September - Mammoth, 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).

[Resources]