September weather forecast and climate
Alton, UT

Weather in September

The first month of the autumn, September, is still a pleasant month in Alton, Utah, with average temperature ranging between max 68.9°F (20.5°C) and min 47.8°F (8.8°C).

Temperature

In Alton, the average high-temperature marginally drops, from a moderately hot 75.6°F (24.2°C) in August, to a pleasant 68.9°F (20.5°C). The average low-temperature, in Alton, is 47.8°F (8.8°C).

Humidity

The average relative humidity in September is 44%.

Rainfall

In Alton, it is raining for 10.1 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, there are 84.8 rainfall days, and 22.05" (560mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows in Alton. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 66.4 snowfall days, and 75.08" (1907mm) of snow is accumulated.

Daylight

The average length of the day is 12.4h.

Sunshine

In Alton, the average sunshine is 9.6h.

UV index

In September, the average daily maximum UV index in Alton is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Alton?

In September, the average relative humidity in Alton, Utah, is 44%.

How much does it rain in Alton in September?

In September, the rain falls for 10.1 days. Throughout September, 1.73" (44mm) of precipitation is accumulated.

When does it start to snow in Alton?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

What is the average length of the day in September in Alton?

In September, the average length of the day in Alton, Utah, is 12.4h.

How many hours of sunshine does Alton have in September?

In September, the average sunshine in Alton, Utah, is 9.6h.

What is the UV index intensity in September in Alton?

In Alton, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Alton, UT

Average temperature in September - Alton, UT
  • Average high temperature in September: 68.9°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is December (32.9°F).

  • Average low temperature in September: 47.8°F

The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is December (17.2°F).

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Average pressure in September
Alton, UT

Average pressure in September - Alton, UT
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.2").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in September
Alton, UT

Average wind speed in September - Alton, UT
  • Average wind speed in September: 6.7mph

The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

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Average humidity in September
Alton, UT

Average humidity in September - Alton, UT
  • Average humidity in September: 44%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is June (29%).

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Average rainfall in September
Alton, UT

Average rainfall in September - Alton, UT
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is July (3.98").
The driest month (with the least rainfall) is June (0.39").

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Average rainfall days in September
Alton, UT

Average rainfall days in September - Alton, UT
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall in September
Alton, UT

Average snowfall in September - Alton, UT
  • Average snowfall in September: 0.04"

The month with the highest snowfall is December (14.06").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Alton, UT

Average snowfall days in September - Alton, UT
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (12.5 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Alton, UT

Average daylight in September / Average sunshine in September - Alton, UT
  • Average daylight in September: 12.4h

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

  • Average sunshine in September: 9.6h

The month with the most sunshine is June (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.8).

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Average sunshine days in September
Alton, UT

Average sunshine days in September - Alton, UT
  • Average sunshine days in September: 17.1 days

The month with the most sunshine days is June (23.4 days).
The month with the least sunshine days is July (13.3 days).

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Average UV index in September
Alton, UT

Average UV index in September - Alton, UT
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Alton, UT

Average cloud cover in September - Alton, UT
  • Average cloud cover in September: 13

Months with the most cloud cover are February and December (Cloud cover 38).
The month with the least cloud cover is June (Cloud cover 10).

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Average visibility in September
Alton, UT

Average visibility in September - Alton, UT
  • Average visibility in September: 6mi

Months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February and December (5mi).

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