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 Pompeys Pillar, the beginning of September is marked by a lowered average high-temperature, shifting from August's 85.1°F (29.5°C) to a still warm 75.2°F (24°C). September's nights observe an average temperature of 54.7°F (12.6°C).Humidity
In Pompeys Pillar, Montana, the average relative humidity in September is 42%.Rainfall
In September, in Pompeys Pillar, the rain falls for 6.7 days. Throughout September, 1.06" (27mm) of precipitation is accumulated. In Pompeys Pillar, during the entire year, the rain falls for 103 days and collects up to 11.97" (304mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 56.7 snowfall days, and 25.16" (639mm) of snow is accumulated.Daylight
The average length of the day in September in Pompeys Pillar is 12h and 31min.On the first day of September, sunrise is at 6:33 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:53 pm MDT.
Sunshine
The average sunshine in September in Pompeys Pillar is 10.6h.UV index
In September, the average daily maximum UV index in Pompeys Pillar is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What are the temperatures in Pompeys Pillar in September?
What is the average humidity in September in Pompeys Pillar?
How many days does it rain in September in Pompeys Pillar?
When does it start snowing in Pompeys Pillar?
What is the average length of the day in September in Pompeys Pillar?
When are sunrise and sunset in September in Pompeys Pillar?
How many hours of sunshine does Pompeys Pillar have in September?
What is the UV index reading in September in Pompeys Pillar?
Average temperature in September
Pompeys Pillar, MT
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in September
Pompeys Pillar, 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
Pompeys Pillar, MT
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).
Average humidity in September
Pompeys Pillar, MT
- Average humidity in September: 42%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Pompeys Pillar, MT
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (1.81").
The driest month (with the least rainfall) is August (0.63").
Average rainfall days in September
Pompeys Pillar, MT
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is May (13.6 days).
The month with the least rainy days is December (5.9 days).
Average snowfall in September
Pompeys Pillar, MT
- Average snowfall in September: 0.08"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Pompeys Pillar, MT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Pompeys Pillar, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in September
Pompeys Pillar, 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 February (13.3 days).
Average UV index in September
Pompeys Pillar, MT
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Pompeys Pillar, MT
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Pompeys Pillar, 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).
Pompeys Pillar, Montana, USA
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