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
A mild drop in Alta's average high-temperature is observed in September, transitioning from 82.4°F (28°C) in August to a still warm 76.6°F (24.8°C). Alta anticipates a stark contrast in temperature during September nights, with an average low of 48°F (8.9°C).Humidity
In Alta, the average relative humidity in September is 44%.Rainfall
In Alta, in September, it is raining for 3.8 days, with typically 0.47" (12mm) of accumulated precipitation. In Alta, during the entire year, the rain falls for 72.9 days and collects up to 36.06" (916mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.35" (9mm) of snow. In Alta, during the entire year, snow falls for 53.3 days and aggregates up to 151.57" (3850mm) of snow.Daylight
In Alta, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:32 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm PDT.
Sunshine
The average sunshine in September is 11.2h.UV index
In Alta, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Alta have in September?
What is the UV index reading in September?
Average temperature in September
Alta, CA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (52.9°F).
The coldest month (with the lowest average low temperature) is December (29.1°F).
Average pressure in September
Alta, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Alta, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is February (6.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Alta, CA
- Average humidity in September: 44%
The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is July (39%).
Average rainfall in September
Alta, CA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is March (7.09").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Alta, CA
- Average rainfall days in September: 3.8 days
The month with the highest number of rainy days is April (11 days).
The month with the least rainy days is July (1.8 days).
Average snowfall in September
Alta, CA
- Average snowfall in September: 0.35"
The month with the highest snowfall is March (37.6").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Alta, CA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is March (11.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Alta, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Alta, CA
- Average sunshine days in September: 25.7 days
The month with the most sunshine days is July (28 days).
The month with the least sunshine days is March (12.6 days).
Average UV index in September
Alta, CA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Alta, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in September
Alta, CA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March and April (5mi).
Alta, California, USA
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