September weather forecastSupai, AZ
September
Weather in September
Supai, Arizona, USA, welcomes the fall season in September with dwindling temperatures and shorter daylight hours. A noticeable decrease in temperature becomes visible, moving down from August's high of 84.2°F (29°C) to 78.3°F (25.7°C), setting the stage for the imminent arrival of cooler temperatures. Even though October carries forward the trend of decreasing temperatures, it also introduces slightly more rainfall. The autumn leaves add a burst of color to the landscape, making it a beautiful time for sightseeing and photography. Mild weather, combined with stunning natural beauty, makes September an ideal time to explore Supai.Temperature
September is characterized by a mild reduction in the average high-temperature, from 84.2°F (29°C) in August to a still moderately hot 78.3°F (25.7°C). Supai's nighttime temperature in September falls to an average of 57.2°F (14°C).Humidity
In Supai, the average relative humidity in September is 36%.Rainfall
In Supai, in September, it is raining for 3.3 days, with typically 0.2" (5mm) of accumulated precipitation. In Supai, during the entire year, the rain falls for 46.7 days and collects up to 4.29" (109mm) of precipitation.Snowfall
In Supai, snow does not fall in June through September.Daylight
The average length of the day in September in Supai is 12h and 23min.On the first day of September, sunrise is at 6:02 am and sunset at 6:58 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 6:15 pm MST.
Sunshine
In September, the average sunshine is 9.8h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Supai, AZ
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is December (26.2°F).
Average pressure in September
Supai, AZ
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Supai, AZ
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is January (6.6mph).
Average humidity in September
Supai, AZ
- Average humidity in September: 36%
The month with the highest relative humidity is January (64%).
The month with the lowest relative humidity is June (21%).
Average rainfall in September
Supai, AZ
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is March (0.51").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Supai, AZ
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is July (6 days).
The month with the least rainy days is June (1.9 days).
Average snowfall in September
Supai, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.11").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Supai, AZ
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are February and December (5.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Supai, AZ
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 48min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 6h and 48min).
Average sunshine days in September
Supai, AZ
- Average sunshine days in September: 25.3 days
The month with the most sunshine days is June (27.3 days).
The month with the least sunshine days is February (21.4 days).
Average UV index in September
Supai, 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
Supai, AZ
- Average cloud cover in September: 9
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
Supai, 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).
