September weather forecast and climate
Butte, AK

Weather in September

September, the first month of the autumn, in Butte, is also a frosty month, with average temperature varying between 36.5°F (2.5°C) and 48.7°F (9.3°C).

Temperature

In September, the average high-temperature slightly decreases, from a mild 57.6°F (14.2°C) in August, to a frosty 48.7°F (9.3°C). In September, in Butte, the average low-temperature is 36.5°F (2.5°C).

Humidity

The average relative humidity in Butte is 77%.

Rainfall

September is the month with the most rainfall in Butte, Alaska. Rain falls for 20.6 days and accumulates 2.24" (57mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Butte, Alaska. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Butte, during the entire year, snow falls for 76.2 days, and aggregates up to 33.5" (851mm) of snow.

Daylight

In September, the average length of the day is 12.8h.

Sunshine

In September, the average sunshine is 8.1h.

UV index

In September, the average daily maximum UV index in Butte is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 temperature in September in Butte?

In Butte, Alaska, in September, the average high-temperature is 48.7°F (9.3°C), and the average low-temperature is 36.5°F (2.5°C).

What is the average humidity in September in Butte?

In September, the average relative humidity in Butte is 77%.

How much does it rain in Butte in September?

In Butte, in September, during 20.6 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

What is the wettest month in Butte?

The month with the most rainfall in Butte is September when the rain falls for 20.6 days and typically aggregates up to 2.24" (57mm) of precipitation.

When does it start snowing in Butte?

September is the first month it typically snows in Butte. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Butte have in September?

In Butte, the average length of the day in September is 12.8h.

How many hours of sunshine does Butte have in September?

The average sunshine in September is 8.1h.

How high is the UV index in September in Butte?

In Butte, Alaska, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Butte, AK

Average temperature in September - Butte, AK
  • Average high temperature in September: 48.7°F

The warmest month (with the highest average high temperature) is July (61.2°F).
The month with the lowest average high temperature is January (18.1°F).

  • Average low temperature in September: 36.5°F

The month with the highest average low temperature is July (44.2°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).

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Average pressure in September
Butte, AK

Average pressure in September - Butte, AK
  • Average pressure in September: 29.75"

The month with the highest atmospheric pressure is July (29.96").
Months with the lowest atmospheric pressure are November and December (29.7").

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Average wind speed in September
Butte, AK

Average wind speed in September - Butte, AK
  • Average wind speed in September: 4.3mph

The windiest month (with the highest average wind speed) is January (5.5mph).
The calmest month (with the lowest average wind speed) is July (4mph).

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Average humidity in September
Butte, AK

Average humidity in September - Butte, AK
  • Average humidity in September: 77%

The month with the highest relative humidity is March (87%).
Months with the lowest relative humidity are May and June (69%).

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Average rainfall in September
Butte, AK

Average rainfall in September - Butte, AK
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is September (2.24").
The driest month (with the least rainfall) is January (0.91").

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Average rainfall days in September
Butte, AK

Average rainfall days in September - Butte, AK
  • Average rainfall days in September: 20.6 days

The month with the highest number of rainy days is June (22.4 days).
The month with the least rainy days is February (8.9 days).

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Average snowfall in September
Butte, AK

Average snowfall in September - Butte, AK
  • Average snowfall in September: 0.08"

The month with the highest snowfall is February (6.93").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Butte, AK

Average snowfall days in September - Butte, AK
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is February (14.1 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Butte, AK

Average daylight in September / Average sunshine in September - Butte, AK
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 19.4h).
The month with the shortest days is December (Average daylight: 5.5h).

  • Average sunshine in September: 8.1h

The month with the most sunshine is May (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 3.9h).

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Average sunshine days in September
Butte, AK

Average sunshine days in September - Butte, AK
  • Average sunshine days in September: 7.5 days

The month with the most sunshine days is January (13.9 days).
The month with the least sunshine days is June (5.3 days).

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Average UV index in September
Butte, AK

Average UV index in September - Butte, AK
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 4).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Butte, AK

Average cloud cover in September - Butte, AK
  • Average cloud cover in September: 42

The month with the most cloud cover is April (Cloud cover 46).
The month with the least cloud cover is January (Cloud cover 37).

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Average visibility in September
Butte, AK

Average visibility in September - Butte, AK
  • 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 February, March and April (4mi).

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