Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Mammoth Lakes's progression into September involves a gentle drop in the average high-temperature, from a pleasant 72.1°F (22.3°C) in August to a comfortable 65.8°F (18.8°C). In Mammoth Lakes, September nights witness a remarkable decline from the day's zenith to a wintry 41.5°F (5.3°C).Humidity
In Mammoth Lakes, the average relative humidity in September is 38%.Rainfall
In September, in Mammoth Lakes, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, in Mammoth Lakes, there are 47.7 rainfall days, and 4.92" (125mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. 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, California, during the entire year, snow falls for 60.8 days and aggregates up to 28.58" (726mm) of snow.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:26 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:39 pm PDT.
Sunshine
The average sunshine in September in Mammoth Lakes is 11h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
What is the temperature in September in Mammoth Lakes?
What is the average humidity in September in Mammoth Lakes?
How much does it rain in Mammoth Lakes in September?
When does it start to snow in Mammoth Lakes?
How many hours of daylight does Mammoth Lakes have in September?
When are sunrise and sunset in September in Mammoth Lakes?
How long on average sun shines in September in Mammoth Lakes?
How high is the UV index in September in Mammoth Lakes?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Mammoth Lakes, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- 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).
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).
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).
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).
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).
Mammoth Lakes, California, USA
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