September weather forecastBig Bear Lake, CA
September
Weather in September
September starts to bring a hint of fall to Big Bear Lake's weather. Temperatures begin to drop slightly, welcoming the first touch of autumn's crisp coolness. A significant drop in rainfall to 0.28" (7mm) signals the gradual transition from the monsoons to fall. The changing colors of the leaves and the cool breezes make this the perfect time for sightseeing and exploring the city's unique attractions.Temperature
Big Bear Lake notes an average high-temperature of a moderately hot 83.3°F (28.5°C) in September, displaying minor variation from August. Throughout September, the temperature falls to an average low of 62.6°F (17°C).Humidity
In Big Bear Lake, the average relative humidity in September is 33%.Rainfall
In September, the rain falls for 3.1 days. Throughout September, 0.28" (7mm) of precipitation is accumulated. Throughout the year, there are 41.6 rainfall days, and 7.8" (198mm) of precipitation is accumulated.Snowfall
In Big Bear Lake, snow does not fall in June through October.Daylight
In Big Bear Lake, the average length of the day in September 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 6:42 am and sunset at 6:32 pm PDT.
Sunshine
The average sunshine in September is 10.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).
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").
The 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).
The 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: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 36min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
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
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).
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).
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).
