September weather forecast
Yuma, AZ

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Arizona/California border with the Colorado River in Yuma, Arizona
Arizona/California border with the Colorado River in Yuma, Arizona

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

The onset of September in Yuma results in a small decrease in the average high-temperature, moderately receding from a blisteringly hot 105.1°F in August to a sweltering 99.5°F. September brings an average low-temperature of 81°F to Yuma.

Humidity

The average relative humidity in September in Yuma is 29%.

Rainfall

The months with the most rainfall are July and September, with an average 0.39" of precipitation.

Daylight

In Yuma, the average length of the day in September is 12h and 22min.
On the first day of September in Yuma, sunrise is at 6:13 am and sunset at 7:03 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 6:24 pm MST.

Sunshine

In Yuma, the average sunshine in September is 9.8h.

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum daily UV index of 8 during September morphs into the following directions:
Emphasize protection. Neglecting it can lead to swift damage to the skin and eyes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

How hot is it in Yuma in September?

The average high-temperature and low-temperature in Yuma during September are 99.5°F and 81°F respectively.

What is the average humidity in September in Yuma?

The average relative humidity in September in Yuma is 29%.

What is the wettest month in Yuma?

The months with the most rainfall in Yuma are July and September, with an average 0.39" of precipitation.

How many days does it rain in September in Yuma?

In September, in Yuma, the rain falls for 4.6 days. Throughout September, 0.39" of precipitation is accumulated.

What is the average length of the day in September in Yuma?

In September, the average day length is 12h and 22min.

When is the sunrise / sunset in September in Yuma?

In September, on the first day of the month, sunrise is at 6:13 am and sunset at 7:03 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 6:24 pm MST.

How long on average sun shines in September in Yuma?

In September, the average sunshine duration in Yuma, Arizona, is 9.8h.

What is the month with the highest UV index in Yuma?

June through September, with an average maximum UV index of 8, are months with the highest UV index.

How high is the UV index in September in Yuma?

In September, the average daily maximum UV index in Yuma, Arizona, is 8. A UV Index estimate of 8 to 10 represents a very high health risk from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Yuma, AZ

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).

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Average pressure in September
Yuma, AZ

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).

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Average wind speed in September
Yuma, AZ

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).

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Average humidity in September
Yuma, AZ

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%).

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Average rainfall in September
Yuma, AZ

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").

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Average rainfall days in September
Yuma, AZ

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).

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Average daylight in September /
Average sunshine in September
Yuma, AZ

Average daylight in September / Average sunshine in September - Yuma, AZ
  • Average daylight in September: 12h and 2min

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 5min

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).

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Average sunshine days in September
Yuma, AZ

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).

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Average UV index in September
Yuma, AZ

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).

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Average cloud cover in September
Yuma, AZ

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).

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Average visibility in September
Yuma, AZ

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).

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Yuma, Arizona, USA

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