September weather forecastYuma, AZ
September
Weather in September
The arrival of September heralds a transition from the scorching Arizona as temperatures start their descent from the summer highs. The grip of extreme heat starts to loosen with the arrival of early autumn, but still ample sun ensures daytime remains warm. With an impressive average 9.8 hours of sunshine daily, September in Yuma is a blend of receding heat and the incoming spirit of fall. The significant decrease in temperature and the gradual shortening of daylight hours point to the slow but sure arrival of cooler weather. The month of September simultaneously offers respite from summer and a preparation for the much-anticipated fall.Temperature
September in Yuma, Arizona, implies a soft temperature shift, with average high-temperatures reducing from August's extremely hot 105.1°F (40.6°C) to a fiery hot 99.5°F (37.5°C). During September, Yuma observes a consistent average nighttime temperature of 81°F (27.2°C).Humidity
In September, the average relative humidity is 29%.Rainfall
The months with the most rainfall are July and September, with an average 0.39" (10mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:02 pm. On the last day of September, in Yuma, sunrise is at 6:32 am and sunset at 6:23 pm MST.
Sunshine
The average sunshine in September is 9.8h.UV index
The months with the highest UV index in Yuma, Arizona, are June through September, with an average maximum UV index of 8. A UV Index reading of 8 to 10 represents a very high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 8 in September translates into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Yuma, AZ
- Average high temperature in September: 99.5°F
The warmest month (with the highest average high temperature) is July (105.3°F).
The month with the lowest average high temperature is December (66°F).
- Average low temperature in September: 81°F
The month with the highest average low temperature is August (86.4°F).
The coldest month (with the lowest average low temperature) is December (50.5°F).
Average pressure in September
Yuma, AZ
- Average pressure in September: 29.78"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.74"Hg).
Average wind speed in September
Yuma, AZ
- Average wind speed in September: 6.9mph
The windiest months (with the highest average wind speed) are April and July (8.5mph).
The calmest month (with the lowest average wind speed) is November (6.6mph).
Average humidity in September
Yuma, AZ
- Average humidity in September: 29%
The month with the highest relative humidity is December (38%).
The month with the lowest relative humidity is June (22%).
Average rainfall in September
Yuma, AZ
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are July and September (0.39").
The driest months (with the least rainfall) are May and June (0.04").
Average rainfall days in September
Yuma, AZ
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is July (5.8 days).
The month with the least rainy days is May (0.8 days).
Average daylight in September /
Average sunshine in September
Yuma, AZ
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 48min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 12min).
Average sunshine days in September
Yuma, AZ
- Average sunshine days in September: 23 days
The month with the most sunshine days is May (30.2 days).
The month with the least sunshine days is July (22.1 days).
Average UV index in September
Yuma, AZ
- Average UV index in September: 8
The months with the highest UV index are June, July, August and September (UV index 8).
The months with the lowest UV index are November and December (UV index 4).
Average cloud cover in September
Yuma, AZ
- Average cloud cover in September: 8
The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility in September
Yuma, 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).
