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
A subtle change in temperatures is noted as August gives way to September, with average highs reducing from a hot 88.3°F (31.3°C) to a moderately hot 82.4°F (28°C). In September, in Sun Valley, the average low-temperature is a refreshing 62.6°F (17°C).Humidity
In Sun Valley, Arizona, 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. In Sun Valley, Arizona, during the entire year, the rain falls for 74.3 days and collects up to 7.2" (183mm) of precipitation.Snowfall
In Sun Valley, snow does not fall in May through October.Daylight
In September, the average length of the day in Sun Valley is 12h and 23min.On the first day of September in Sun Valley, 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
The average sunshine in September in Sun Valley is 10.4h.UV index
In September, the average daily maximum UV index in Sun Valley is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Frequently asked questions
How hot is it in Sun Valley in September?
What is the average humidity in September in Sun Valley?
How much does it rain in Sun Valley in September?
When it does not snow in Sun Valley?
What is the average length of the day in September in Sun Valley?
When is the sunrise / sunset in September in Sun Valley?
How many hours of sunshine does Sun Valley have in September?
What is the UV index intensity in September in Sun Valley?
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 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 54min).
- Average sunshine in September: 10h and 2min
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).
Sun Valley, Arizona, USA
Weather forecast for your location
2. Allow the app to use your location
