September weather forecast and climate
Mountain Pass, CA

Weather in September

The first month of the autumn, September, is also a hot month in Mountain Pass, California, with average temperature ranging between min 71.2°F (21.8°C) and max 88.9°F (31.6°C).

Temperature

In Mountain Pass, California, the average high-temperature slightly decreases, from a very hot 97.3°F (36.3°C) in August, to a tropical 88.9°F (31.6°C). The average low-temperature, in September, is 71.2°F (21.8°C).

Humidity

In Mountain Pass, the average relative humidity is 23%.

Rainfall

In Mountain Pass, in September, it is raining for 4 days, with typically 0.28" (7mm) of accumulated precipitation. Throughout the year, there are 42.9 rainfall days, and 3.23" (82mm) of precipitation is accumulated.

Snowfall

In Mountain Pass, California, snow does not fall in January, March through December.

Daylight

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

Sunshine

In Mountain Pass, the average sunshine is 10.3h.

UV index

In Mountain Pass, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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.
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FAQ

What is the temperature in September in Mountain Pass?

In Mountain Pass, California, in September, the average high-temperature is 88.9°F (31.6°C), and the average low-temperature is 71.2°F (21.8°C).

What is the average humidity in September in Mountain Pass?

In Mountain Pass, California, the average relative humidity in September is 23%.

How much does it rain in Mountain Pass in September?

In Mountain Pass, in September, during 4 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

When it does not snow in Mountain Pass?

In Mountain Pass snow does not fall in January, March through December.

How many hours of daylight does Mountain Pass have in September?

In Mountain Pass, California, the average length of the day in September is 12.4h.

How long on average sun shines in September in Mountain Pass?

In Mountain Pass, the average sunshine in September is 10.3h.

How high is the UV index in September in Mountain Pass?

In Mountain Pass, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Mountain Pass, CA

Average temperature in September - Mountain Pass, CA
  • Average high temperature in September: 88.9°F

The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is December (50.9°F).

  • Average low temperature in September: 71.2°F

Months with the highest average low temperature are July and August (78.4°F).
The coldest month (with the lowest average low temperature) is December (38.8°F).

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Average pressure in September
Mountain Pass, CA

Average pressure in September - Mountain Pass, CA
  • Average pressure in September: 29.85"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.76").

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Average wind speed in September
Mountain Pass, CA

Average wind speed in September - Mountain Pass, CA
  • Average wind speed in September: 6.6mph

The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is January (5.4mph).

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Average humidity in September
Mountain Pass, CA

Average humidity in September - Mountain Pass, CA
  • Average humidity in September: 23%

The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is June (15%).

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Average rainfall in September
Mountain Pass, CA

Average rainfall in September - Mountain Pass, CA
  • Average rainfall in September: 0.28"

The wettest months (with the highest rainfall) are July and August (0.55").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Mountain Pass, CA

Average rainfall days in September - Mountain Pass, CA
  • Average rainfall days in September: 4 days

The month with the highest number of rainy days is July (6.1 days).
The month with the least rainy days is June (0.9 days).

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Average snowfall in September
Mountain Pass, CA

Average snowfall in September - Mountain Pass, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.24").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Mountain Pass, CA

Average snowfall days in September - Mountain Pass, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Mountain Pass, CA

Average daylight in September / Average sunshine in September - Mountain Pass, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 10.3h

The month with the most sunshine is August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 7h).

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Average sunshine days in September
Mountain Pass, CA

Average sunshine days in September - Mountain Pass, CA
  • Average sunshine days in September: 22.7 days

The month with the most sunshine days is June (27.6 days).
The month with the least sunshine days is July (18.7 days).

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Average UV index in September
Mountain Pass, CA

Average UV index in September - Mountain Pass, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Mountain Pass, CA

Average cloud cover in September - Mountain Pass, CA
  • Average cloud cover in September: 7

Months with the most cloud cover are January and December (Cloud cover 19).
Months with the least cloud cover are June and August (Cloud cover 6).

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Average visibility in September
Mountain Pass, CA

Average visibility in September - Mountain Pass, 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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