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
As September arrives, Sun Prairie's weather displays a decrease in high-temperatures, transitioning from August's warm 81.5°F (27.5°C) to a pleasant 70.7°F (21.5°C). In the month of September, Sun Prairie experiences an average low-temperature of 50.2°F (10.1°C).Humidity
In September, the average relative humidity in Sun Prairie is 47%.Rainfall
In Sun Prairie, in September, during 7.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 102.6 rainfall days, and 11.89" (302mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Sun Prairie. Throughout September, in the average 0.7 snowfall days, it receives 1.61" (41mm) of snow. Throughout the year, there are 66.6 snowfall days, and 32.17" (817mm) of snow is accumulated.Daylight
In September, the average length of the day in Sun Prairie is 12h and 33min.On the first day of September in Sun Prairie, sunrise is at 6:45 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:06 pm MDT.
Sunshine
The average sunshine in September in Sun Prairie is 9.7h.UV index
In Sun Prairie, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What are the temperatures in Sun Prairie in September?
What is the average humidity in September in Sun Prairie?
How many days does it rain in September in Sun Prairie?
When does it start snowing in Sun Prairie?
What is the average length of the day in September in Sun Prairie?
What time are sunrise and sunset in September in Sun Prairie?
How many hours of sunshine does Sun Prairie have in September?
How high is the UV index in September in Sun Prairie?
Average temperature in September
Sun Prairie, MT
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (29.8°F).
- Average low temperature in September: 50.2°F
The month with the highest average low temperature is August (57.6°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).
Average pressure in September
Sun Prairie, MT
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Sun Prairie, MT
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is November (11.2mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in September
Sun Prairie, MT
- Average humidity in September: 47%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Sun Prairie, MT
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is June (1.97").
The driest months (with the least rainfall) are January and July (0.59").
Average rainfall days in September
Sun Prairie, MT
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is November (4.4 days).
Average snowfall in September
Sun Prairie, MT
- Average snowfall in September: 1.61"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Sun Prairie, MT
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is February (12.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Sun Prairie, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- 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, February and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Sun Prairie, MT
- Average sunshine days in September: 20.5 days
The month with the most sunshine days is September (20.5 days).
The month with the least sunshine days is April (11.6 days).
Average UV index in September
Sun Prairie, 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
Sun Prairie, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Sun Prairie, 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).
Sun Prairie, Montana, USA
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