September weather forecast and climate
Yuma, AZ

Arizona/California border with the Colorado River in Yuma, Arizona
Arizona/California border with the Colorado River in Yuma, Arizona
September, the first month of the autumn, in Yuma, is still a torrid month, with average temperature varying between 81°F (27.2°C) and 99.5°F (37.5°C).

Temperature

In September, the average high-temperature slightly decreases, from an extreme hot 105.1°F (40.6°C) in August, to a torrid 99.5°F (37.5°C). The average low-temperature, in Yuma, is 81°F (27.2°C).

Humidity

In Yuma, the average relative humidity is 29%.

Rainfall

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 is 12.4h.

Sunshine

In Yuma, Arizona, 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 reading of 8 to 10 represents a very high threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 8 transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Yuma?

The average high-temperature, in September, in Yuma, is 99.5°F (37.5°C), while the average low-temperature is 81°F (27.2°C).

What is the average humidity in September in Yuma?

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

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.

What is the rainiest month in Yuma?

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

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

The average length of the day in September is 12.4h.

How long on average sun shines in September in Yuma?

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

When is the highest UV index in Yuma?

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

What is the UV index intensity in September in Yuma?

In Yuma, the average daily maximum UV index in September is 8. A UV Index value of 8 to 10 symbolizes a very high hazard to health from unsafe exposure to the Sun's UV rays.
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"

The month with the highest atmospheric pressure is January (30.07").
The month with the lowest atmospheric pressure is June (29.74").

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: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9.8h

The month with the most sunshine is June (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 7.2h).

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

Months with the highest UV index are June, July, August and September (UV index 8).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).