September weather forecast
Yuma, AZ

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

Weather in September

September, the first month of the autumn in Yuma, is still a very hot month, with an average temperature fluctuating between 81°F (27.2°C) and 99.5°F (37.5°C).

Temperature

In Yuma, the average high-temperature in September marginally drops from a scorching 105.1°F (40.6°C) in August to a sweltering 99.5°F (37.5°C). In Yuma, the average low-temperature is 81°F (27.2°C).

Humidity

In Yuma, the average relative humidity in September is 29%.

Rainfall

The months with the most rainfall in Yuma are July and September, with an average 0.39" (10mm) of precipitation.

Daylight

In September, the average length of the day in Yuma 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 6:32 am and sunset at 6:24 pm MST.

Sunshine

In September, the average sunshine is 9.8h.

UV index

June through September, with an average maximum UV index of 8, are months with the highest UV index. A UV Index value of 8 to 10 symbolizes a very high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Yuma?

In Yuma, Arizona, the average relative humidity in September is 29%.

What is the rainiest month in Yuma?

The months with the most rainfall in Yuma, Arizona, are July and September, with an average 0.39" (10mm) of precipitation.

How many days does it rain in September in Yuma?

In Yuma, Arizona, during September, the rain falls for 4.6 days and regularly aggregates up to 0.39" (10mm) of precipitation.

How many hours of daylight does Yuma have in September?

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

When is the sunrise / sunset in September in Yuma?

On the first day of September, sunrise is at 6:13 am and sunset at 7:03 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 6:24 pm MST.

How many hours of sunshine does Yuma have in September?

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

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

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

How high is the UV index in September in Yuma?

In September, the average daily maximum UV index in Yuma is 8. A UV Index estimate of 8 to 10 represents a very high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
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 22min

The month with the longest days is June (Average daylight: 14h and 16min).
The month with the shortest days is December (Average daylight: 10h and 2min).

  • 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).

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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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