September weather forecastFort Defiance, AZ
September
Weather in September
September, the first month of the autumn in Fort Defiance, is still a warm month, with an average temperature ranging between min 54.1°F (12.3°C) and max 73.4°F (23°C).Temperature
A minor decrease in the average high-temperature is observed during September, shifting from a moderately hot 79.9°F (26.6°C) in August to a still warm 73.4°F (23°C). Throughout September, Fort Defiance encounters an average temperature drop to a fresh 54.1°F (12.3°C).Humidity
The average relative humidity in September is 43%.Rainfall
In Fort Defiance, in September, it is raining for 12.1 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 91.1 rainfall days, and 12.72" (323mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Fort Defiance, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:48 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 7:00 pm MDT.
Sunshine
The average sunshine in September is 10.8h.UV index
In Fort Defiance, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fort Defiance, AZ
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
Fort Defiance, AZ
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Fort Defiance, AZ
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is April (11.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Fort Defiance, AZ
- Average humidity in September: 43%
The month with the highest relative humidity is January (71%).
The month with the lowest relative humidity is June (24%).
Average rainfall in September
Fort Defiance, AZ
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is July (2.76").
The driest month (with the least rainfall) is June (0.39").
Average rainfall days in September
Fort Defiance, AZ
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is July (19.7 days).
The month with the least rainy days is November (3.1 days).
Average snowfall in September
Fort Defiance, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Fort Defiance, AZ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Fort Defiance, AZ
- Average daylight in September: 12h and 24min
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: 10h and 48min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The months with the least sunshine are January and December (Average sunshine: 6h and 24min).
Average sunshine days in September
Fort Defiance, AZ
- Average sunshine days in September: 13.7 days
The month with the most sunshine days is November (23.5 days).
The month with the least sunshine days is July (8.7 days).
Average UV index in September
Fort Defiance, 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
Fort Defiance, AZ
- Average cloud cover in September: 13
The months with the most cloud cover are January and December (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 10).
Average visibility in September
Fort Defiance, AZ
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
