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
September ushers in a minute temperature change, with average high-temperatures reducing from August's refreshing 57.6°F (14.2°C) to a frosty 48.7°F (9.3°C). An average low-temperature of 36.5°F (2.5°C) is anticipated throughout the nights during September.Humidity
In Butte, the average relative humidity in September is 77%.Rainfall
The month with the most rainfall is September, when the rain falls for 20.6 days and typically aggregates up to 2.24" (57mm) of precipitation.Snowfall
January through May, September through December are months with snowfall 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. In Butte, Alaska, 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 in Butte, Alaska, is 12h and 52min.On the first day of the month, sunrise is at 6:49 am and sunset at 9:02 pm. On the last day of September, sunrise is at 8:02 am and sunset at 7:28 pm AKDT.
Sunshine
In September, the average sunshine in Butte is 8.1h.UV index
In Butte, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 2 suggests these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What is the average September temperature in Butte?
What is the average humidity in September in Butte?
What is the wettest month in Butte?
How much does it rain in Butte in September?
When does it start snowing in Butte?
What is the average length of the day in September in Butte?
When is the sunrise / sunset in September in Butte?
How many hours of sunshine does Butte have in September?
What is the UV index intensity in September in Butte?
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).
Average pressure in September
Butte, AK
- Average pressure in September: 29.75"Hg
The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.7"Hg).
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).
Average humidity in September
Butte, AK
- Average humidity in September: 77%
The month with the highest relative humidity is March (87%).
The months with the lowest relative humidity are May and June (69%).
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").
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).
Average snowfall in September
Butte, AK
- Average snowfall in September: 0.08"
The month with the highest snowfall is February (6.93").
The months with the least snowfall are June, July and August (0").
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).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Butte, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 24min).
The month with the shortest days is December (Average daylight: 5h and 30min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is May (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
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).
Average UV index in September
Butte, AK
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and December (UV index 1).
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).
Average visibility in September
Butte, AK
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are February, March and April (4mi).
Butte, Alaska, USA
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