September weather forecast
Avon, MT

Weather in September

September, the first month of the autumn, in Avon, is also an enjoyable month, with average temperature fluctuating between 41.2°F (5.1°C) and 65.5°F (18.6°C).

Temperature

In Avon, the average high-temperature drops, from a moderately hot 75.7°F (24.3°C) in August, to a comfortable 65.5°F (18.6°C). In September, in Avon, the average low-temperature is 41.2°F (5.1°C).

Humidity

In Avon, the average relative humidity in September is 55%.

Rainfall

In Avon, during September, the rain falls for 9.7 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in Avon, Montana, there are 151.7 rainfall days, and 16.46" (418mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.2 snowfall days, it receives 1.73" (44mm) of snow. Throughout the year, in Avon, there are 105 snowfall days, and 49.69" (1262mm) of snow is accumulated.

Daylight

In Avon, the average length of the day in September is 12.5h.

Sunshine

The average sunshine in Avon is 9.7h.

UV index

The average daily maximum UV index in Avon is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
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. 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. 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 Avon?

In Avon, the average relative humidity in September is 55%.

How many days does it rain in September in Avon?

In Avon, during September, the rain falls for 9.7 days and regularly aggregates up to 1.14" (29mm) of precipitation.

When does it start snowing in Avon?

September is the first month it typically snows in Avon. Throughout September, in the average 1.2 snowfall days, it receives 1.73" (44mm) of snow.

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

In September, the average length of the day in Avon is 12.5h.

How long on average sun shines in September in Avon?

The average sunshine in September in Avon is 9.7h.

What is the UV index reading in September in Avon?

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Avon, MT

Average temperature in September - Avon, MT
  • Average high temperature in September: 65.5°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).

  • Average low temperature in September: 41.2°F

The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (11.7°F).

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Average pressure in September
Avon, MT

Average pressure in September - Avon, MT
  • Average pressure in September: 29.98"

Months with the highest atmospheric pressure are January and December (30.19").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Avon, MT

Average wind speed in September - Avon, MT
  • Average wind speed in September: 5.6mph

The windiest months (with the highest average wind speed) are January and April (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in September
Avon, MT

Average humidity in September - Avon, MT
  • Average humidity in September: 55%

Months with the highest relative humidity are January and February (88%).
Months with the lowest relative humidity are July and August (49%).

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Average rainfall in September
Avon, MT

Average rainfall in September - Avon, MT
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.87").

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Average rainfall days in September
Avon, MT

Average rainfall days in September - Avon, MT
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is May (19.9 days).
The month with the least rainy days is December (8.8 days).

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Average snowfall in September
Avon, MT

Average snowfall in September - Avon, MT
  • Average snowfall in September: 1.73"

The month with the highest snowfall is February (8.78").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Avon, MT

Average snowfall days in September - Avon, MT
  • Average snowfall days in September: 1.2 days

The month with the highest number of snowfall days is February (19.7 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
Avon, MT

Average daylight in September / Average sunshine in September - Avon, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 9.7h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 5.5h).

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Average sunshine days in September
Avon, MT

Average sunshine days in September - Avon, MT
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is September (16.1 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in September
Avon, MT

Average UV index in September - Avon, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in September
Avon, MT

Average cloud cover in September - Avon, MT
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in September
Avon, MT

Average visibility in September - Avon, MT
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February and December (4mi).

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