September weather forecast
Big Bear Lake, CA

Big Bear Lake, California, with close rocks amid trees, and mountains in the distance
Big Bear Lake, California, with close rocks amid trees, and mountains in the distance

Weather in September

September, the first month of the autumn in Big Bear Lake, is still a warm month, with an average temperature fluctuating between 83.3°F (28.5°C) and 62.6°F (17°C).

Temperature

In September, the average high-temperature is practically the same as in August - a warm 83.3°F (28.5°C). The average low-temperature, in September, is 62.6°F (17°C).

Humidity

In Big Bear Lake, the average relative humidity in September is 33%.

Rainfall

In Big Bear Lake, during September, the rain falls for 3.1 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Big Bear Lake, California, during the entire year, the rain falls for 41.6 days and collects up to 7.8" (198mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In September, the average length of the day in Big Bear Lake is 12h and 22min.
On the first day of September, sunrise is at 6:21 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:33 pm PDT.

Sunshine

The average sunshine in September in Big Bear Lake is 10.6h.

UV index

In Big Bear Lake, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Big Bear Lake?

The average relative humidity in September is 33%.

How many days does it rain in September in Big Bear Lake?

In Big Bear Lake, California, in September, it is raining for 3.1 days, with typically 0.28" (7mm) of accumulated precipitation.

When it does not snow in Big Bear Lake?

June through October are months without snowfall in Big Bear Lake.

What is the average length of the day in September in Big Bear Lake?

In September, the average day length in Big Bear Lake, California, is 12h and 22min.

When is the sunrise / sunset in September in Big Bear Lake?

In September, on the first day of the month, sunrise is at 6:21 am and sunset at 7:13 pm. On the last day of the month, in Big Bear Lake, California, sunrise is at 6:41 am and sunset at 6:33 pm PDT.

How many hours of sunshine does Big Bear Lake have in September?

The average sunshine duration in September in Big Bear Lake is 10.6h.

What is the UV index reading in September in Big Bear Lake?

The average daily maximum UV index in September in Big Bear Lake, California, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.

Average temperature in September
Big Bear Lake, CA

Average temperature in September - Big Bear Lake, CA
  • Average high temperature in September: 83.3°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (52.5°F).

  • Average low temperature in September: 62.6°F

The month with the highest average low temperature is August (66.9°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in September
Big Bear Lake, CA

Average pressure in September - Big Bear Lake, CA
  • Average pressure in September: 29.85"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.82").

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Average wind speed in September
Big Bear Lake, CA

Average wind speed in September - Big Bear Lake, CA
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is September (5.6mph).

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Average humidity in September
Big Bear Lake, CA

Average humidity in September - Big Bear Lake, CA
  • Average humidity in September: 33%

The month with the highest relative humidity is December (52%).
The month with the lowest relative humidity is August (29%).

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Average rainfall in September
Big Bear Lake, CA

Average rainfall in September - Big Bear Lake, CA
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is December (1.26").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in September
Big Bear Lake, CA

Average rainfall days in September - Big Bear Lake, CA
  • Average rainfall days in September: 3.1 days

The month with the highest number of rainy days is July (5 days).
The month with the least rainy days is June (1.4 days).

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Average snowfall in September
Big Bear Lake, CA

Average snowfall in September - Big Bear Lake, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (6.54").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Big Bear Lake, CA

Average snowfall days in September - Big Bear Lake, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Big Bear Lake, CA

Average daylight in September / Average sunshine in September - Big Bear Lake, CA
  • Average daylight in September: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 25min).
The month with the shortest days is December (Average daylight: 9h and 55min).

  • Average sunshine in September: 10.6h

The months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.9h).

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Average sunshine days in September
Big Bear Lake, CA

Average sunshine days in September - Big Bear Lake, CA
  • Average sunshine days in September: 25.2 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (22.2 days).

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Average UV index in September
Big Bear Lake, CA

Average UV index in September - Big Bear Lake, CA
  • Average UV index in September: 5

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

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Average cloud cover in September
Big Bear Lake, CA

Average cloud cover in September - Big Bear Lake, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 21).
The months with the least cloud cover are June, August and September (Cloud cover 6).

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Average visibility in September
Big Bear Lake, CA

Average visibility in September - Big Bear Lake, CA
  • 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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