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
Big Sandy's September weather comes with a decrease in average high-temperatures, moving from a moderately hot 82.6°F (28.1°C) in August to a pleasant 71.4°F (21.9°C). Big Sandy experiences a nighttime temperature average of 52.9°F (11.6°C) during September.Humidity
The average relative humidity in September is 44%.Rainfall
In Big Sandy, during September, the rain falls for 6.6 days and regularly aggregates up to 0.47" (12mm) of precipitation. In Big Sandy, during the entire year, the rain falls for 91 days and collects up to 6.42" (163mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.43" (11mm) of snow. In Big Sandy, during the entire year, snow falls for 44.2 days and aggregates up to 11.18" (284mm) of snow.Daylight
In Big Sandy, the average length of the day in September is 12h and 34min.On the first day of September in Big Sandy, sunrise is at 6:39 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:00 pm MDT.
Sunshine
The average sunshine in September in Big Sandy is 9.9h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are September temperatures in Big Sandy?
What is the average humidity in September in Big Sandy?
How many days does it rain in September in Big Sandy?
When does it start snowing in Big Sandy?
How many hours of daylight does Big Sandy have in September?
When is the sunrise / sunset in September in Big Sandy?
How long on average sun shines in September in Big Sandy?
What is the UV index intensity in September in Big Sandy?
Average temperature in September
Big Sandy, MT
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.2°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).
Average pressure in September
Big Sandy, MT
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Big Sandy, MT
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).
Average humidity in September
Big Sandy, MT
- Average humidity in September: 44%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Big Sandy, MT
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is June (1.22").
The driest month (with the least rainfall) is December (0.28").
Average rainfall days in September
Big Sandy, MT
- Average rainfall days in September: 6.6 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
Big Sandy, MT
- Average snowfall in September: 0.43"
The month with the highest snowfall is January (2.4").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Big Sandy, MT
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Big Sandy, 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 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in September
Big Sandy, MT
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is September (21.5 days).
The month with the least sunshine days is June (14.6 days).
Average UV index in September
Big Sandy, MT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Big Sandy, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Big Sandy, 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).
Big Sandy, Montana, USA
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