September weather forecastRound Rock, AZ
September
Weather in September
September, the first month of the autumn in Round Rock, is also a moderately hot month, with temperature in the range of an average low of 60.1°F (15.6°C) and an average high of 77.7°F (25.4°C).Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 84.6°F (29.2°C) in August to a still moderately hot 77.7°F (25.4°C). Round Rock observes an average nighttime low-temperature of 60.1°F (15.6°C) during the month of September.Humidity
In Round Rock, the average relative humidity in September is 34%.Rainfall
In Round Rock, Arizona, in September, it is raining for 8.2 days, with typically 0.71" (18mm) of accumulated precipitation. In Round Rock, during the entire year, the rain falls for 75.5 days and collects up to 7.91" (201mm) of precipitation.Snowfall
In Round Rock, snow does not fall in June through September.Daylight
In September, the average length of the day in Round Rock is 12h and 24min.On the first day of September in Round Rock, sunrise is at 6:49 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:02 pm MDT.
Sunshine
In September, the average sunshine in Round Rock is 10.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 5 in September leads to these recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Round Rock, AZ
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in September
Round Rock, AZ
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Round Rock, AZ
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity in September
Round Rock, AZ
- Average humidity in September: 34%
The month with the highest relative humidity is January (67%).
The month with the lowest relative humidity is June (19%).
Average rainfall in September
Round Rock, AZ
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in September
Round Rock, AZ
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is July (13.7 days).
The months with the least rainy days are February and June (3.3 days).
Average snowfall in September
Round Rock, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Round Rock, AZ
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (5.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Round Rock, 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: 10h and 30min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 42min).
Average sunshine days in September
Round Rock, AZ
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is June (25.4 days).
The month with the least sunshine days is July (13.2 days).
Average UV index in September
Round Rock, AZ
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Round Rock, AZ
- Average cloud cover in September: 10
The months with the most cloud cover are January and December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 9).
Average visibility in September
Round Rock, 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).
