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
In September, the average high-temperature decreases from a warm 79.9°F (26.6°C) in August to a pleasant 70.3°F (21.3°C). Butte, during September, witnesses an average low-temperature of 50.9°F (10.5°C).Humidity
In Butte, the average relative humidity in September is 59%.Rainfall
In September, the rain falls for 9.9 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. Throughout the year, there are 105.9 rainfall days, and 17.32" (440mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 33min.On the first day of September in Butte, sunrise is at 7:02 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:23 pm CDT.
Sunshine
In Butte, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
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 it does not snow in Butte?
Does it snow in September?
How many hours of daylight does Butte have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Butte, ND
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (17.1°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (3°F).
Average pressure in September
Butte, ND
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is February (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Butte, ND
- Average wind speed in September: 10.4mph
The windiest month (with the highest average wind speed) is October (11.5mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).
Average humidity in September
Butte, ND
- Average humidity in September: 59%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (57%).
Average rainfall in September
Butte, ND
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is June (3.07").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
Butte, ND
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Butte, ND
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Butte, ND
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (16 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Butte, ND
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Butte, ND
- Average sunshine days in September: 18 days
The month with the most sunshine days is September (18 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in September
Butte, ND
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Butte, ND
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Butte, ND
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Butte, North Dakota, USA
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