Big Bear Lake, CA weather in September
Big Bear Lake is mild and dry in September: highs average 73°F and nights drop to about 44°F. Expect about 2 wet days. A great month for outdoor plans.
- Normal high
- 73°F
- Normal low
- 44°F
- Wet days
- 2
- 0.4 in total
- Daylight
- 12.4 h
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 77°F | 69°F |
| Normal low | 47°F | 40°F |
| Chance of a wet day | 9% | 5% |
| Sunrise / sunset | 6:21 am / 7:14 pm | 6:41 am / 6:33 pm |
| Daylight | 12.9 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)26 of 30
- Hot dayshigh 90°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow2 of 30
- Notable rainat least 0.10 in1 of 30
- Freezing nightslow 32°F or below1 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.4 in; a dry September brings about 0.03 in and a wet one about 0.6 in (25th and 75th percentiles). Days with half an inch or more are rare. Snow is very rare.
How September varies from year to year
- Warmest September, 1991-20202003: average high 78°F
- Coolest September2017: average high 71°F
- Wettest September1997: 2.0 in
- Driest September1993: no measurable precipitation
- Highest reading87°F (September 6, 2020)
- Lowest reading26°F (September 25, 2007)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 79°F | 73°F | 63°F |
| Normal low | 50°F | 44°F | 35°F |
| Wet days | 3 | 2 | 2 |
| Comfortable days | 16 | 26 | 18 |
| Daylight | 13.4 h | 12.4 h | 11.3 h |
Highs change by -6°F from August and -10°F into October.
Nearby alternatives in September
- Warmer: San Bernardino, CA24 mi · high 92°F · 1 wet day
How Big Bear Lake ranks in September
- Normal high319th warmest of 378 cities; 56th of 60 in California
- Wet days59th driest of 378
What to pack for Big Bear Lake in September
- Layers – afternoons near 73°F but nights near 44°F
Heating and cooling
September has 198 heating degree days and 3 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Big Bear Lake in September?
The normal high is 73°F and the normal low is 44°F. From 1991 to 2020 the hottest September reading was 87°F (most recently on September 6, 2020).
Does it rain a lot in Big Bear Lake in September?
About 2 days in September have at least 0.01 in of precipitation, and the normal total is 0.4 in. The wettest September in 1991-2020 was in 1997 (2.0 in); the driest was in 1993, with no measurable precipitation.
Is September a good time to visit Big Bear Lake?
September ranks 1st of 12 months on our comfort score for Big Bear Lake (87 out of 100). It has about 26 comfortable days (judged by temperature only). The best month is September.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Big Bear Lake (USC00040741), 0.3 mi W of the city center, 6,753 ft . NOAA normals and daily records, 1991-2020.
- Not available for this location: snow depth, humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).