Mammoth Lakes weather in September: Mammoth Lakes, California: normal highs, lows, rain and records for September
Mammoth Lakes in September has a normal high of 71°F and a normal low of 40°F, a daily mean of 56°F, falling from 75°F on the 1st to 66°F by the 30th. The month brings 0.47 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 4°C, 12 mm of precipitation in September.
- NOAA stationMammoth Lakes Ranger Station
- Station IDUSC00045280
- Location37.65°N 118.96°W
- Elevation7,804 ft (2,379 m)
- Population7,124
- Jan 41° 17°
- Feb 41° 18°
- Mar 46° 22°
- Apr 51° 27°
- May 60° 35°
- Jun 70° 42°
- Jul 78° 49°
- Aug 77° 47°
- Sep 71° 40°
- Oct 61° 30°
- Nov 49° 23°
- Dec 41° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Mammoth Lakes in September?
The normal high is 71°F and the normal low 40°F, for a daily mean of 55.5°F. September is 6.9°F cooler than August and 10.0°F warmer than October. September is the 4th warmest month of the year in Mammoth Lakes and the 11th wettest. Across the month the normal high falls 9°F, from 75°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 54°F and 58°F.
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 75°F | 45°F | – | – |
| September 8 | 74°F | 43°F | – | – |
| September 15 | 72°F | 40°F | – | – |
| September 22 | 69°F | 38°F | – | – |
| September 30 | 66°F | 35°F | – | – |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 75°F | 45°F | – | – | 13 h |
| September 2 | 75°F | 44°F | – | – | 13 h |
| September 3 | 75°F | 44°F | – | – | 13 h |
| September 4 | 75°F | 44°F | – | – | 13 h |
| September 5 | 75°F | 44°F | – | – | 12 h 50 min |
| September 6 | 74°F | 43°F | – | – | 12 h 50 min |
| September 7 | 74°F | 43°F | – | – | 12 h 50 min |
| September 8 | 74°F | 43°F | – | – | 12 h 50 min |
| September 9 | 74°F | 42°F | – | – | 12 h 40 min |
| September 10 | 73°F | 42°F | – | – | 12 h 40 min |
| September 11 | 73°F | 42°F | – | – | 12 h 40 min |
| September 12 | 73°F | 41°F | – | – | 12 h 40 min |
| September 13 | 72°F | 41°F | – | – | 12 h 30 min |
| September 14 | 72°F | 41°F | – | – | 12 h 30 min |
| September 15 | 72°F | 40°F | – | – | 12 h 30 min |
| September 16 | 71°F | 40°F | – | – | 12 h 30 min |
| September 17 | 71°F | 39°F | – | – | 12 h 20 min |
| September 18 | 71°F | 39°F | – | – | 12 h 20 min |
| September 19 | 70°F | 39°F | – | – | 12 h 20 min |
| September 20 | 70°F | 38°F | – | – | 12 h 20 min |
| September 21 | 70°F | 38°F | – | – | 12 h 10 min |
| September 22 | 69°F | 38°F | – | – | 12 h 10 min |
| September 23 | 69°F | 37°F | – | – | 12 h 10 min |
| September 24 | 69°F | 37°F | – | – | 12 h 10 min |
| September 25 | 68°F | 36°F | – | – | 12 h 10 min |
| September 26 | 68°F | 36°F | – | – | 12 h |
| September 27 | 67°F | 36°F | – | – | 12 h |
| September 28 | 67°F | 35°F | – | – | 12 h |
| September 29 | 67°F | 35°F | – | – | 12 h |
| September 30 | 66°F | 35°F | – | – | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 40°FSeptember average
- Precipitation
- 0.47 inmonth total
- Nights at 32°F or colder
- 5
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 2
- Sunshine
- 92%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00045280; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Mammoth Lakes in September?
In a normal September in Mammoth Lakes, 5 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00045280.
How does September in Mammoth Lakes compare across California?
Across the 219 places PlainClimate covers in California, September normal highs run from 64°F in Eureka to 104°F in Brawley; Mammoth Lakes's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Mammoth Lakes in August77°F by day, 47°F at night
- Mammoth Lakes in October61°F by day, 30°F at night
- Mammoth Lakes through the yearEvery month, frost dates, records and recent years
- California in SeptemberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Septembernormal high 104°F