September weather forecast and climate
Sierra Vista, CA

Weather in September

The first month of the autumn, September, is also a hot month in Sierra Vista, California, with temperature in the range of an average low of 62.6°F (17°C) and an average high of 92.1°F (33.4°C).

Temperature

In September, the average high-temperature marginally drops, from a very hot 98.2°F (36.8°C) in August, to a hot 92.1°F (33.4°C). The average low-temperature, in Sierra Vista, California, is 62.6°F (17°C).

Humidity

The average relative humidity in Sierra Vista is 34%.

Rainfall

In Sierra Vista, California, it is raining for 1.5 days, with typically 0.08" (2mm) of accumulated precipitation. Throughout the year, in Sierra Vista, there are 51 rainfall days, and 7.56" (192mm) of precipitation is accumulated.

Daylight

The average length of the day is 12.4h.

Sunshine

In Sierra Vista, the average sunshine is 11.4h.

UV index

In Sierra Vista, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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 temperature in September in Sierra Vista?

In September, the average high-temperature is 92.1°F (33.4°C), and the average low-temperature is 62.6°F (17°C).

What is the average humidity in September in Sierra Vista?

The average relative humidity in September in Sierra Vista, California, is 34%.

How many days does it rain in September in Sierra Vista?

In Sierra Vista, in September, during 1.5 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

What is the average length of the day in September in Sierra Vista?

In September, the average length of the day is 12.4h.

How long on average sun shines in September in Sierra Vista?

The average sunshine in September in Sierra Vista is 11.4h.

What is the UV index reading in September in Sierra Vista?

In Sierra Vista, California, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Sierra Vista, CA

Average temperature in September - Sierra Vista, CA
  • Average high temperature in September: 92.1°F

The warmest month (with the highest average high temperature) is July (100°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in September: 62.6°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

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Average pressure in September
Sierra Vista, CA

Average pressure in September - Sierra Vista, CA
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Sierra Vista, CA

Average wind speed in September - Sierra Vista, CA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is June (7.9mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).

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Average humidity in September
Sierra Vista, CA

Average humidity in September - Sierra Vista, CA
  • Average humidity in September: 34%

The month with the highest relative humidity is January (68%).
The month with the lowest relative humidity is July (31%).

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Average rainfall in September
Sierra Vista, CA

Average rainfall in September - Sierra Vista, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is March (1.46").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in September
Sierra Vista, CA

Average rainfall days in September - Sierra Vista, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is June (0.8 days).

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Average daylight in September /
Average sunshine in September
Sierra Vista, CA

Average daylight in September / Average sunshine in September - Sierra Vista, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 11.4h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.2h).

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Average sunshine days in September
Sierra Vista, CA

Average sunshine days in September - Sierra Vista, CA
  • Average sunshine days in September: 27.2 days

The month with the most sunshine days is June (28.8 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in September
Sierra Vista, CA

Average UV index in September - Sierra Vista, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Sierra Vista, CA

Average cloud cover in September - Sierra Vista, CA
  • Average cloud cover in September: 5

Months with the most cloud cover are March and December (Cloud cover 30).
Months with the least cloud cover are July, August and September (Cloud cover 5).

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Average visibility in September
Sierra Vista, CA

Average visibility in September - Sierra Vista, CA
  • 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).

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