September weather forecast
Mammoth Lakes, CA

Perfect water reflections of trees, rocks, and distant mountains in the clear water of Mammoth Lakes, California
Perfect water reflections of trees, rocks, and distant mountains in the clear water of Mammoth Lakes, California

Weather in September

The first month of the autumn, September, is also an enjoyable month in Mammoth Lakes, California, with an average temperature ranging between max 65.8°F (18.8°C) and min 41.5°F (5.3°C).

Temperature

In Mammoth Lakes, California, the average high-temperature in September slightly decreases from a pleasant 72.1°F (22.3°C) in August to a comfortable 65.8°F (18.8°C). In September, the average low-temperature is 41.5°F (5.3°C).

Humidity

In September, the average relative humidity is 38%.

Rainfall

In September, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, there are 47.7 rainfall days, and 4.92" (125mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Mammoth Lakes are January through June, September through December. September is the first month it typically snows in Mammoth Lakes. Throughout September, in the average 0.7 snowfall days, it receives 0.12" (3mm) of snow. In Mammoth Lakes, during the entire year, snow falls for 60.8 days and aggregates up to 28.58" (726mm) of snow.

Daylight

In Mammoth Lakes, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:26 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:40 pm PDT.

Sunshine

In September, the average sunshine is 11h.

UV index

In Mammoth Lakes, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Mammoth Lakes?

In September, the average relative humidity in Mammoth Lakes, California, is 38%.

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

In Mammoth Lakes, California, in September, during 1.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

When does it start to snow in Mammoth Lakes?

September is the first month it typically snows in Mammoth Lakes, California. Throughout September, in the average 0.7 snowfall days, it receives 0.12" (3mm) of snow.

How many hours of daylight does Mammoth Lakes have in September?

The average day length in September in Mammoth Lakes is 12h and 25min.

When is the sunrise / sunset in September in Mammoth Lakes?

On the first day of September in Mammoth Lakes, California, sunrise is at 6:26 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:40 pm PDT.

How long on average sun shines in September in Mammoth Lakes?

In September, the average sunshine duration in Mammoth Lakes is 11h.

How high is the UV index in September in Mammoth Lakes?

In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Mammoth Lakes, CA

Average temperature in September - Mammoth Lakes, CA
  • Average high temperature in September: 65.8°F

The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is February (34°F).

  • Average low temperature in September: 41.5°F

The month with the highest average low temperature is July (48.2°F).
The coldest month (with the lowest average low temperature) is February (14.9°F).

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Average pressure in September
Mammoth Lakes, CA

Average pressure in September - Mammoth Lakes, CA
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in September
Mammoth Lakes, CA

Average wind speed in September - Mammoth Lakes, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is March (6.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.9mph).

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Average humidity in September
Mammoth Lakes, CA

Average humidity in September - Mammoth Lakes, CA
  • Average humidity in September: 38%

The month with the highest relative humidity is February (76%).
The month with the lowest relative humidity is August (34%).

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Average rainfall in September
Mammoth Lakes, CA

Average rainfall in September - Mammoth Lakes, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (0.94").
The driest months (with the least rainfall) are August and October (0.08").

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Average rainfall days in September
Mammoth Lakes, CA

Average rainfall days in September - Mammoth Lakes, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is April (6.3 days).
The month with the least rainy days is August (1.8 days).

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Average snowfall in September
Mammoth Lakes, CA

Average snowfall in September - Mammoth Lakes, CA
  • Average snowfall in September: 0.12"

The month with the highest snowfall is February (5.67").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Mammoth Lakes, CA

Average snowfall days in September - Mammoth Lakes, CA
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is March (11.3 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Mammoth Lakes, CA

Average daylight in September / Average sunshine in September - Mammoth Lakes, CA
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 37min).

  • Average sunshine in September: 11h and 0min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).

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Average sunshine days in September
Mammoth Lakes, CA

Average sunshine days in September - Mammoth Lakes, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is October (27.3 days).
The month with the least sunshine days is March (18.2 days).

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Average UV index in September
Mammoth Lakes, CA

Average UV index in September - Mammoth Lakes, CA
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Mammoth Lakes, CA

Average cloud cover in September - Mammoth Lakes, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 30).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Mammoth Lakes, CA

Average visibility in September - Mammoth Lakes, 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).

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