September weather forecastTucson, AZ
September
Weather in September
September in Tucson marks the ornate transition from summer to fall, resulting in a noticeable decrease in humidity. The departure from August's temperatures is evident in the cooler nights and shorter days. The weather pattern also changes in September, moving from the monsoon-prone condition to drier climate hints at the upcoming winter season. September's weather oscillations set the stage for October's more definitive fall climate. The third fall month records a lower pressure of 29.88in, a dip from that in the summer months.Temperature
Tucson's September reports an average high-temperature of a still tropical 88.7°F (31.5°C), exhibiting a minor difference from August. An average nighttime temperature of 70.7°F (21.5°C) is witnessed throughout September.Heat index
The heat index value for September is estimated at a tropical 89.6°F (32°C). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.When referencing the heat index, its values are suitable for shady environments and light breezes. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', reflects the feeling of heat when considering both air temperature and humidity. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Humidity
In Tucson, the average relative humidity in September is 40%.Rainfall
In Tucson, Arizona, during September, the rain falls for 8.6 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Tucson, during the entire year, the rain falls for 66.1 days and collects up to 7.95" (202mm) of precipitation.Snowfall
February through December are months without snowfall.Daylight
In Tucson, the average length of the day in September is 12h and 21min.On the first day of the month, sunrise is at 5:59 am and sunset at 6:47 pm. On the last day of September, sunrise is at 6:17 am and sunset at 6:09 pm MST.
Sunshine
In Tucson, the average sunshine in September is 9.8h.UV index
In September, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 7 in September translates into these instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tucson, AZ
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is June (96.6°F).
The month with the lowest average high temperature is December (60.8°F).
- Average low temperature in September: 70.7°F
The month with the highest average low temperature is July (77°F).
The coldest months (with the lowest average low temperature) are January and December (43°F).
Average pressure in September
Tucson, AZ
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Tucson, AZ
- Average wind speed in September: 6.1mph
The windiest months (with the highest average wind speed) are April and May (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Tucson, AZ
- Average humidity in September: 40%
The month with the highest relative humidity is December (45%).
The month with the lowest relative humidity is June (19%).
Average rainfall in September
Tucson, AZ
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is July (1.42").
The driest month (with the least rainfall) is May (0.08").
Average rainfall days in September
Tucson, AZ
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is May (1.3 days).
Average snowfall in September
Tucson, AZ
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.08").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Tucson, AZ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Tucson, AZ
- Average daylight in September: 12h and 24min
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 48min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Tucson, AZ
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is May (29.3 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Tucson, AZ
- Average UV index in September: 7
The month with the highest UV index is June (UV index 8).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in September
Tucson, AZ
- Average cloud cover in September: 13
The month with the most cloud cover is December (Cloud cover 19).
The months with the least cloud cover are May and June (Cloud cover 7).
Average visibility in September
Tucson, 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).
