Big Bear Lake Weather in September
Big Bear Lake in September sees high daytime temperatures of 24°C (75°F) and nighttime lows of 6°C (43°F). With just 10 mm (0.4 in) of rainfall expected, it's a dry month overall.
Rainfall in Big Bear Lake in September
Rain is expected on roughly 3 days, totalling around 10 mm (0.4 in) for the month. The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Big Bear Lake in September
Big Bear Lake in September has excellent weather. Days reach 24°C (75°F) and nights cool to 6°C (43°F). Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 6°C (43°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances for Big Bear Lake.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Big Bear Lake's climate page.
Big Bear Lake Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
24°C (75°F)
Chance of Rain
10%
Precipitation
10 mm (0.4 in)
Rainy days
3 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Big Bear Lake typically drop from around 32°C (90°F) at the start of September to approximately 29°C (84°F) by the end. Nights are cool, with lows typically ranging from 12°C (54°F) to 16°C (61°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Big Bear Lake in September
Browse day-by-day weather records for Big Bear Lake spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Big Bear Lake historical weather extremes in September
The extremes listed below come from historical weather data collected in Big Bear Lake from 1976 through 2025.
- The hottest September day on record in Big Bear Lake reached 43°C (109°F) (September 3, 1988).
- Big Bear Lake experienced its chilliest September day on September 26, 2013, reaching only 9°C (48°F).
- The lowest overnight temperature recorded in September was -3°C (27°F) (September 14, 2016).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Big Bear Lake in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. With minimal rainfall expected, you can leave the rain gear at home.What To Do in Big Bear Lake in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Big Bear Lake's climate page.
See the full Big Bear Lake climate overview or explore weather in the United States of America.
