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's onset corresponds with a shift in the average high-temperature, moving from a moderately hot 78.1°F (25.6°C) in August to a refreshing 67.6°F (19.8°C). Heart Butte witnesses an average low-temperature of 48.4°F (9.1°C) throughout the month of September.Humidity
In September, the average relative humidity in Heart Butte is 49%.Rainfall
In Heart Butte, during September, the rain falls for 6.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Heart Butte, Montana. September is the first month it typically snows in Heart Butte. Throughout September, in the average 0.8 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, in Heart Butte, Montana, there are 54.3 snowfall days, and 19.49" (495mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:50 am and sunset at 8:12 pm. On the last day of September, in Heart Butte, sunrise is at 7:30 am and sunset at 7:11 pm MDT.
Sunshine
In September, the average sunshine in Heart Butte is 9.6h.UV index
In Heart Butte, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake protective steps - Recommendations to avoid sunburn are issued. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What is the temperature in September in Heart Butte?
What is the average humidity in September in Heart Butte?
How much does it rain in Heart Butte in September?
When does it start to snow in Heart Butte?
How many hours of daylight does Heart Butte have in September?
What time are sunrise and sunset in September in Heart Butte?
How long on average sun shines in September in Heart Butte?
How high is the UV index in September in Heart Butte?
Average temperature in September
Heart Butte, MT
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 48.4°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).
Average pressure in September
Heart Butte, MT
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Heart Butte, MT
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).
Average humidity in September
Heart Butte, MT
- Average humidity in September: 49%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Heart Butte, MT
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Heart Butte, MT
- Average rainfall days in September: 6.2 days
The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).
Average snowfall in September
Heart Butte, MT
- Average snowfall in September: 0.51"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Heart Butte, MT
- Average snowfall days in September: 0.8 days
The month with the highest number of snowfall days is December (10.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Heart Butte, MT
- 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 24min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in September
Heart Butte, MT
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).
Average UV index in September
Heart Butte, MT
- 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, March, October, November and December (UV index 2).
Average cloud cover in September
Heart Butte, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Heart Butte, MT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Heart Butte, Montana, USA
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