Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September in Flagstaff signifies a minor drop in average high-temperature, transitioning from 81°F (27.2°C) in August to a still moderately hot 75.2°F (24°C). Flagstaff registers a consistent average low-temperature of 53.8°F (12.1°C) during September.Humidity
The average relative humidity in September is 44%.Rainfall
In Flagstaff, during September, the rain falls for 9 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, in Flagstaff, there are 74.8 rainfall days, and 12.56" (319mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Flagstaff.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 5:59 am and sunset at 6:52 pm. On the last day of September, in Flagstaff, sunrise is at 6:21 am and sunset at 6:11 pm MST.
Sunshine
The average sunshine in September is 9.7h.UV index
The average daily maximum UV index in September in Flagstaff is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Flagstaff in September?
What is the average humidity in September in Flagstaff?
How much does it rain in Flagstaff in September?
When it does not snow in Flagstaff?
Does it snow in Flagstaff in September?
What is the average length of the day in September in Flagstaff?
When are sunrise and sunset in September in Flagstaff?
How many hours of sunshine does Flagstaff have in September?
What is the UV index intensity in September in Flagstaff?
Average temperature in September
Flagstaff, AZ
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The months with the lowest average high temperature are January and December (42.6°F).
- Average low temperature in September: 53.8°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).
Average pressure in September
Flagstaff, AZ
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Flagstaff, AZ
- Average wind speed in September: 6.5mph
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).
Average humidity in September
Flagstaff, AZ
- Average humidity in September: 44%
The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).
Average rainfall in September
Flagstaff, AZ
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is June (0.24").
Average rainfall days in September
Flagstaff, AZ
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is July (16.2 days).
The months with the least rainy days are February and November (2.5 days).
Average snowfall in September
Flagstaff, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is December (7.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Flagstaff, AZ
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Flagstaff, AZ
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 4min
The months with the most sunshine are June and August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in September
Flagstaff, AZ
- Average sunshine days in September: 17.8 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).
Average UV index in September
Flagstaff, AZ
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Flagstaff, AZ
- Average cloud cover in September: 11
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 7).
Average visibility in September
Flagstaff, AZ
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Flagstaff, Arizona, USA
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