September weather forecastSun Valley, AZ
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Sun Valley, Arizona, with an average temperature ranging between max 82.4°F (28°C) and min 62.6°F (17°C).Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a hot 88.3°F (31.3°C) in August to a moderately hot 82.4°F (28°C). Throughout the nights in September, an average low-temperature of 62.6°F (17°C) is noted.Humidity
The average relative humidity in September is 35%.Rainfall
In Sun Valley, in September, during 7.8 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 74.3 rainfall days, and 7.2" (183mm) of precipitation is accumulated.Snowfall
In Sun Valley, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 5:53 am and sunset at 6:46 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:04 pm MST.
Sunshine
In Sun Valley, the average sunshine in September is 10.4h.UV index
In Sun Valley, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sun Valley, AZ
- Average high temperature in September: 82.4°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (46.8°F).
- Average low temperature in September: 62.6°F
The month with the highest average low temperature is July (70.5°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).
Average pressure in September
Sun Valley, AZ
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).
Average wind speed in September
Sun Valley, AZ
- Average wind speed in September: 7.7mph
The windiest months (with the highest average wind speed) are April and May (10.6mph).
The calmest month (with the lowest average wind speed) is January (6.1mph).
Average humidity in September
Sun Valley, AZ
- Average humidity in September: 35%
The month with the highest relative humidity is January (59%).
The month with the lowest relative humidity is June (18%).
Average rainfall in September
Sun Valley, AZ
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the least rainfall) is June (0.16").
Average rainfall days in September
Sun Valley, AZ
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is July (13.3 days).
The months with the least rainy days are June and November (3.4 days).
Average snowfall in September
Sun Valley, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sun Valley, AZ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sun Valley, 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 54min).
- Average sunshine in September: 10h and 24min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in September
Sun Valley, AZ
- Average sunshine days in September: 19.4 days
The months with the most sunshine days are May, June and November (25.3 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in September
Sun Valley, AZ
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Sun Valley, AZ
- Average cloud cover in September: 11
The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is June (Cloud cover 9).
Average visibility in September
Sun Valley, 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).
