September weather forecast and climate
Barstow, CA

The vast desert region of Mojave, with the modern section of the Barstow residential community in California
The vast desert region of Mojave, with the modern section of the Barstow residential community in California

Weather in September

September, the first month of the autumn, in Barstow, is also a hot month, with temperature in the range of an average high of 88.3°F (31.3°C) and an average low of 67.3°F (19.6°C).

Temperature

In September, the average high-temperature slightly decreases, from a very hot 95.4°F (35.2°C) in August, to a tropical 88.3°F (31.3°C). The average low-temperature, in Barstow, is 67.3°F (19.6°C).

Humidity

In Barstow, the average relative humidity is 27%.

Rainfall

In Barstow, California, in September, it is raining for 1.9 days, with typically 0.08" (2mm) of accumulated precipitation. Throughout the year, in Barstow, there are 36.5 rainfall days, and 3.11" (79mm) of precipitation is accumulated.

Snowfall

In Barstow snow does not fall in February through October and December.

Daylight

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

Sunshine

The average sunshine in Barstow is 10.7h.

UV index

In Barstow, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
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 Barstow?

In September, in Barstow, the average high-temperature is 88.3°F (31.3°C), and the average low-temperature is 67.3°F (19.6°C).

What is the average humidity in September in Barstow?

In September, the average relative humidity is 27%.

How much does it rain in Barstow in September?

In Barstow, in September, during 1.9 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

When it does not snow in Barstow?

In Barstow snow does not fall in February through October and December.

How many hours of daylight does Barstow have in September?

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

How many hours of sunshine does Barstow have in September?

The average sunshine in September in Barstow is 10.7h.

What is the UV index intensity in September in Barstow?

In Barstow, California, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Barstow, CA

Average temperature in September - Barstow, CA
  • Average high temperature in September: 88.3°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (54.3°F).

  • Average low temperature in September: 67.3°F

The month with the highest average low temperature is August (72.9°F).
The coldest month (with the lowest average low temperature) is December (38.7°F).

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Average pressure in September
Barstow, CA

Average pressure in September - Barstow, CA
  • Average pressure in September: 29.85"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.81").

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Average wind speed in September
Barstow, CA

Average wind speed in September - Barstow, CA
  • Average wind speed in September: 8.6mph

The windiest month (with the highest average wind speed) is May (12.6mph).
The calmest month (with the lowest average wind speed) is January (6.3mph).

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Average humidity in September
Barstow, CA

Average humidity in September - Barstow, CA
  • Average humidity in September: 27%

Months with the highest relative humidity are January and December (48%).
The month with the lowest relative humidity is August (23%).

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Average rainfall in September
Barstow, CA

Average rainfall in September - Barstow, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (0.55").
The driest month (with the least rainfall) is June (0").

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Average rainfall days in September
Barstow, CA

Average rainfall days in September - Barstow, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is December (5.6 days).
The month with the least rainy days is June (0.2 days).

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Average snowfall in September
Barstow, CA

Average snowfall in September - Barstow, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is November (0.39").
Months with the least snowfall are February, March, April, May, June, July, August, September, October and December (0").

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Average snowfall days in September
Barstow, CA

Average snowfall days in September - Barstow, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Barstow, CA

Average daylight in September / Average sunshine in September - Barstow, 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: 10.7h

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 7.1h).

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Average sunshine days in September
Barstow, CA

Average sunshine days in September - Barstow, CA
  • Average sunshine days in September: 27.5 days

The month with the most sunshine days is June (29.8 days).
The month with the least sunshine days is February (22.8 days).

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Average UV index in September
Barstow, CA

Average UV index in September - Barstow, CA
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
Barstow, CA

Average cloud cover in September - Barstow, CA
  • Average cloud cover in September: 5

The month with the most cloud cover is December (Cloud cover 19).
Months with the least cloud cover are June, August and September (Cloud cover 5).

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Average visibility in September
Barstow, CA

Average visibility in September - Barstow, 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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