September weather forecast and climate
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
The first month of the autumn, September, is still a warm month in Big Bear Lake, California, with average temperature varying between 83.3°F (28.5°C) and 62.6°F (17°C).

Temperature

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

Humidity

In September, the average relative humidity is 33%.

Rainfall

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

Snowfall

In Big Bear Lake snow does not fall in June through October.

Daylight

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

Sunshine

In Big Bear Lake, the average sunshine is 10.6h.

UV index

In Big Bear Lake, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for 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.

What is the temperature in September in Big Bear Lake?

The average high-temperature, in September, in Big Bear Lake, is 83.3°F (28.5°C), while the average low-temperature is 62.6°F (17°C).

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

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

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

In September, in Big Bear Lake, the rain falls for 3.1 days. Throughout September, 0.28" (7mm) of precipitation is accumulated.

When it does not snow in Big Bear Lake?

In Big Bear Lake, California, snow does not fall in June through October.

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

In Big Bear Lake, the average length of the day in September is 12.4h.

How long on average sun shines in September in Big Bear Lake?

In Big Bear Lake, the average sunshine in September is 10.6h.

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

The average daily maximum UV index in September in Big Bear Lake, California, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
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).

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").

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).

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%).

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").

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).

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

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

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).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Big Bear Lake, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.6h

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).

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).

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

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

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).
Months with the least cloud cover are June, August and September (Cloud cover 6).

Average visibility in September - Big Bear Lake, 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).