September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

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

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.

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Frequently asked questions

How hot is it in Yuma in September?

In Yuma, in September, the average high-temperature is 99.5°F (37.5°C), and 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 is 29%.

What is the wettest month in Yuma?

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

How much does it rain in Yuma in September?

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?

The average day length in September is 12h and 22min.

When are sunrise and sunset in September in Yuma?

In September, on the first day of the month, sunrise is at 6:13 am and sunset at 7:02 pm. On the last day of the month, in Yuma, Arizona, sunrise is at 6:32 am and sunset at 6:23 pm MST.

How many hours of sunshine does Yuma have in September?

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

When is the highest UV index in Yuma?

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

What is the UV index intensity in September in Yuma?

The average daily maximum UV index in September in Yuma, Arizona, is 8. A UV Index of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

105.1°F 40.6°C

99.5°F 37.5°C

87.8°F 31°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.8mph 14.2km/h

7.3mph 11.7km/h

7.7mph 12.4km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

22.8

28.2

Average UV index

Average cloud cover

Average visibility

6mi 9.7km

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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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September weather forecast
Yuma, AZ

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