September weather forecastWindow Rock, AZ
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Window Rock, Arizona, with an average temperature fluctuating between 54.5°F (12.5°C) and 73.8°F (23.2°C).Temperature
The transition to September results in a modest reduction in average high-temperature, moving from a moderately hot 80.2°F (26.8°C) in August to a still warm 73.8°F (23.2°C). Nighttime temperature dips to a mean of 54.5°F (12.5°C) during September.Humidity
The average relative humidity in September is 43%.Rainfall
In Window Rock, in September, during 11.9 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Window Rock, during the entire year, the rain falls for 90.1 days and collects up to 11.93" (303mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September in Window Rock, 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
In Window Rock, Arizona, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, a regular UV index of 5 translates into these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Window Rock, AZ
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in September
Window Rock, 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
Window Rock, AZ
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (11.4mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Window Rock, AZ
- Average humidity in September: 43%
The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is June (23%).
Average rainfall in September
Window Rock, AZ
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is July (2.44").
The driest month (with the least rainfall) is June (0.35").
Average rainfall days in September
Window Rock, AZ
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in September
Window Rock, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Window Rock, AZ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Window Rock, 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
Window Rock, AZ
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is November (23.7 days).
The month with the least sunshine days is July (8.3 days).
Average UV index in September
Window Rock, 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
Window Rock, AZ
- Average cloud cover in September: 13
The month with the most cloud cover is January (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 10).
Average visibility in September
Window Rock, 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).
