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's transition into September involves a shift in temperature, receding from an agreeable 71.4°F (21.9°C) in August to an enjoyable 61.9°F (16.6°C). In September, a remarkable difference from daytime highs is noted, as Mammoth records an average temperature of 37.6°F (3.1°C) during the night.Humidity
In September, the average relative humidity is 57%.Rainfall
In Mammoth, in September, during 10.5 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, in Mammoth, there are 109.2 rainfall days, and 23.15" (588mm) of precipitation is accumulated.Snowfall
January through July, September through December are months with snowfall in Mammoth. September is the first month it typically snows in Mammoth, Wyoming. Throughout September, in the average 2.4 snowfall days, it receives 3.27" (83mm) of snow. Throughout the year, in Mammoth, there are 159.3 snowfall days, and 120.47" (3060mm) of snow is accumulated.Daylight
In Mammoth, Wyoming, the average length of the day in September is 12h and 31min.On the first day of September in Mammoth, Wyoming, sunrise is at 6:45 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:04 pm MDT.
Sunshine
In September, the average sunshine in Mammoth is 9.8h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 2 translates into these guidelines:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Mammoth in September?
What is the average humidity in September in Mammoth?
How much does it rain in Mammoth in September?
When does it start snowing in Mammoth?
What is the average length of the day in September in Mammoth?
When are sunrise and sunset in September in Mammoth?
How many hours of sunshine does Mammoth have in September?
What is the UV index intensity in September in Mammoth?
Average temperature in September
Mammoth, WY
- Average high temperature in September: 61.9°F
The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).
- Average low temperature in September: 37.6°F
The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).
Average pressure in September
Mammoth, WY
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Mammoth, WY
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Mammoth, WY
- Average humidity in September: 57%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Mammoth, WY
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in September
Mammoth, WY
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in September
Mammoth, WY
- Average snowfall in September: 3.27"
The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").
Average snowfall days in September
Mammoth, WY
- Average snowfall days in September: 2.4 days
The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).
Average daylight in September /
Average sunshine in September
Mammoth, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).
Average sunshine days in September
Mammoth, WY
- Average sunshine days in September: 14.7 days
The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).
Average UV index in September
Mammoth, WY
- Average UV index in September: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in September
Mammoth, WY
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in September
Mammoth, WY
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).
Mammoth, Wyoming, USA
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