September weather forecast and climate
Mammoth Lakes, CA

What is the temperature in September in Mammoth Lakes?

In Mammoth Lakes, California, in September, the average high-temperature is 69.4°F (20.8°C), and the average low-temperature is 37.6°F (3.1°C).

How many days does it rain in September in Mammoth Lakes?

In Mammoth Lakes, California, in September, during 2 rainfall days, typically 0.4" (9.4mm) of precipitation is accumulated.

Does it snow in Mammoth Lakes in September?

In Mammoth Lakes, California, in September, it doesn't snow. In October, it regularly snows.
Average temperature in September - Mammoth Lakes, CA
  • Average high temperature in September: 69.5°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in September: 37.5°F

The month with the highest average low temperature is July (45.3°F).
The coldest month (with the lowest average low temperature) is January (14.8°F).

Average rainfall in September - Mammoth Lakes, CA
  • Average rainfall in September: 0.4"

The wettest month (with the highest rainfall) is January (4.6").
The driest month (with the lowest rainfall) is August (0.3").

Average rainfall days in September - Mammoth Lakes, CA
  • Average rainfall days in September: 2 days

Months with the highest number of rainy days are January and February (9 days).
Months with the lowest number of rainy days are August and September (2 days).

Average snowfall in September - Mammoth Lakes, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (45.3").
Months with the lowest snowfall are July, August and September (0").

Average daylight in September / Average sunshine in September - Mammoth Lakes, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 10h

The month with most sunshine is July (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 6h).

Average UV index in September - Mammoth Lakes, CA
  • Average UV index in September: 8

Months with the highest UV index are June and July (UV index 11).
The month with the lowest UV index is December (UV index 2).

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