September weather forecastSaint David, AZ
September
Weather in September
The first month of the autumn, September, is still a warm month in Saint David, Arizona, with an average temperature fluctuating between 85.3°F (29.6°C) and 65.7°F (18.7°C).Temperature
The arrival of September denotes a barely perceptible change in the average high-temperatures to a moderately hot 85.3°F (29.6°C) from August's 90°F (32.2°C). An average low-temperature of 65.7°F (18.7°C) marks the nights throughout September.Heat index
In September, the heat index is estimated at a tropical 86°F (30°C). If one continues to be active during exposure, it might cause tiredness and subsequent heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
In Saint David, the average relative humidity in September is 44%.Rainfall
In Saint David, Arizona, during September, the rain falls for 10 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, there are 76.9 rainfall days, and 10.28" (261mm) of precipitation is accumulated.Snowfall
In Saint David, Arizona, snow does not fall in March through November.Daylight
In September, the average length of the day is 12h and 21min.On the first day of the month, sunrise is at 5:56 am and sunset at 6:44 pm. On the last day of September, sunrise is at 6:14 am and sunset at 6:06 pm MST.
Sunshine
The average sunshine in September in Saint David is 10h.UV index
In September, the average daily maximum UV index in Saint David, Arizona, is 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint David, AZ
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is June (92.8°F).
The month with the lowest average high temperature is December (57.7°F).
- Average low temperature in September: 65.7°F
The month with the highest average low temperature is July (71.8°F).
The coldest months (with the lowest average low temperature) are January and December (38.5°F).
Average pressure in September
Saint David, AZ
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Saint David, AZ
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is April (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Saint David, AZ
- Average humidity in September: 44%
The month with the highest relative humidity is December (48%).
The month with the lowest relative humidity is June (21%).
Average rainfall in September
Saint David, AZ
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is August (2.48").
The driest months (with the least rainfall) are April and May (0.12").
Average rainfall days in September
Saint David, AZ
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is May (2.1 days).
Average snowfall in September
Saint David, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.79").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Saint David, AZ
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Saint David, 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: 10h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Saint David, AZ
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is May (28.4 days).
The month with the least sunshine days is July (9.4 days).
Average UV index in September
Saint David, AZ
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in September
Saint David, AZ
- Average cloud cover in September: 15
The months with the most cloud cover are July and December (Cloud cover 20).
The month with the least cloud cover is May (Cloud cover 7).
Average visibility in September
Saint David, 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).
