August weather forecast and climate
Flagstaff, AZ

The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street

Weather in August

The last month of the summer, August, is another warm month in Flagstaff, Arizona, with average temperature fluctuating between 59.7°F (15.4°C) and 81°F (27.2°C).

Temperature

In August, the average high-temperature is practically the same as in July - a still warm 81°F (27.2°C). The average low-temperature, in Flagstaff, is 59.7°F (15.4°C).

Heat index

The average heat index in August is evaluated at 81.1°F (27.3°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, clothing, pregnancy). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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 Flagstaff, the average relative humidity is 45%.

Rainfall

In Flagstaff, Arizona, during 14 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, there are 74.8 rainfall days, and 12.56" (319mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In Flagstaff, the average length of the day is 13.4h.

Sunshine

Months with the most sunshine in Flagstaff, Arizona, are June and August, with an average of 12.2h of sunshine.

UV index

Months with the highest UV index in Flagstaff, Arizona, are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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 temperature in August in Flagstaff?

In August, in Flagstaff, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 59.7°F (15.4°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines relative humidity and air temperature, is estimated at 81.1°F (27.3°C).

What is the average humidity in August in Flagstaff?

In Flagstaff, Arizona, the average relative humidity in August is 45%.

How many days does it rain in August in Flagstaff?

In August, the rain falls for 14 days. Throughout August, 1.93" (49mm) of precipitation is accumulated.

When it does not snow in Flagstaff?

June through September are months without snowfall in Flagstaff, Arizona.

How many hours of daylight does Flagstaff have in August?

The average length of the day in August is 13.4h.

What is the month with the most sunshine in Flagstaff?

June and August, with an average of 12.2h of sunshine, are months with the most sunshine in Flagstaff, Arizona.

How long on average sun shines in August in Flagstaff?

In Flagstaff, the average sunshine in August is 12.2h.

What are the months with the highest UV index in Flagstaff?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Flagstaff, Arizona.

What is the UV index reading in August in Flagstaff?

The average daily maximum UV index in August in Flagstaff, Arizona, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in August
Flagstaff, AZ

Average temperature in August - Flagstaff, AZ
  • Average high temperature in August: 81°F

The warmest month (with the highest average high temperature) is July (82.8°F).
Months with the lowest average high temperature are January and December (42.6°F).

  • Average low temperature in August: 59.7°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).

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Average pressure in August
Flagstaff, AZ

Average pressure in August - Flagstaff, AZ
  • Average pressure in August: 29.94"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in August
Flagstaff, AZ

Average wind speed in August - Flagstaff, AZ
  • Average wind speed in August: 5.8mph

The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average humidity in August
Flagstaff, AZ

Average humidity in August - Flagstaff, AZ
  • Average humidity in August: 45%

The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).

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Average rainfall in August
Flagstaff, AZ

Average rainfall in August - Flagstaff, AZ
  • Average rainfall in August: 1.93"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is June (0.24").

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Average rainfall days in August
Flagstaff, AZ

Average rainfall days in August - Flagstaff, AZ
  • Average rainfall days in August: 14 days

The month with the highest number of rainy days is July (16.2 days).
Months with the least rainy days are February and November (2.5 days).

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Average snowfall in August
Flagstaff, AZ

Average snowfall in August - Flagstaff, AZ
  • Average snowfall in August: 0"

The month with the highest snowfall is December (7.36").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Flagstaff, AZ

Average snowfall days in August - Flagstaff, AZ
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (7.4 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in August /
Average sunshine in August
Flagstaff, AZ

Average daylight in August / Average sunshine in August - Flagstaff, AZ
  • Average daylight in August: 13.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in August: 12.2h

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

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Average sunshine days in August
Flagstaff, AZ

Average sunshine days in August - Flagstaff, AZ
  • Average sunshine days in August: 12.3 days

The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (11.4 days).

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Average UV index in August
Flagstaff, AZ

Average UV index in August - Flagstaff, AZ
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
Flagstaff, AZ

Average cloud cover in August - Flagstaff, AZ
  • Average cloud cover in August: 13

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 August
Flagstaff, AZ

Average visibility in August - Flagstaff, AZ
  • Average visibility in August: 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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