September weather forecastSierra Vista, AZ
September
Weather in September
September marks the beginning of a gradual decrease in both temperatures and rainfall. While the temperature drops slightly, the city receives significantly less rainfall compared to the preceding months, with an average precipitation of 2.32" (59mm). Sierra Vista's favorable climatic shift in September makes for a pleasant sightseeing and travel experience. Daylight hours start to wane, signaling the departure of summer and the onset of fall. Conditions remain suitable for outdoor activities during this transitional period.Temperature
September's arrival shows an average high-temperature of a moderately hot 81.7°F (27.6°C), hardly different from the previous month. September nights cool down to an average low-temperature of 63.1°F (17.3°C).Heat index
The heat index value during September is estimated at 82.4°F (28°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.In the scope of the heat index, its values resonate with shade and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Humidity
September is the most humid month, with an average relative humidity of 50%.Rainfall
In Sierra Vista, during September, the rain falls for 12.9 days and regularly aggregates up to 2.32" (59mm) of precipitation. In Sierra Vista, during the entire year, the rain falls for 92.2 days and collects up to 15.47" (393mm) of precipitation.Snowfall
In Sierra Vista, snow does not fall in April through November.Daylight
In Sierra Vista, the average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 5:57 am and sunset at 6:44 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:06 pm MST.
Sunshine
In Sierra Vista, the average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 6 transforms into these recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sierra Vista, AZ
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is June (90.1°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (69.6°F).
The coldest months (with the lowest average low temperature) are January and December (37.8°F).
Average pressure in September
Sierra Vista, AZ
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Sierra Vista, AZ
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Sierra Vista, AZ
- Average humidity in September: 50%
The month with the highest relative humidity is September (50%).
The months with the lowest relative humidity are May and June (23%).
Average rainfall in September
Sierra Vista, AZ
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is July (4.53").
The driest month (with the least rainfall) is May (0.12").
Average rainfall days in September
Sierra Vista, AZ
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is May (2.3 days).
Average snowfall in September
Sierra Vista, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Sierra Vista, AZ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Sierra Vista, AZ
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 54min
The months with the most sunshine are June and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Sierra Vista, AZ
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is May (28.1 days).
The month with the least sunshine days is July (6.5 days).
Average UV index in September
Sierra Vista, AZ
- Average UV index in September: 6
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Sierra Vista, AZ
- Average cloud cover in September: 17
The month with the most cloud cover is July (Cloud cover 24).
The month with the least cloud cover is May (Cloud cover 8).
Average visibility in September
Sierra Vista, 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).
