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 comes with a drop in the average high-temperature, falling from August's moderately hot 83.1°F (28.4°C) to an agreeable 73.2°F (22.9°C). In September, Billings's temperature tends to fall to an average low of 52.5°F (11.4°C) during the night.Humidity
The average relative humidity in September is 44%.Rainfall
In September, the rain falls for 9.1 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. Throughout the year, there are 128.5 rainfall days, and 14.69" (373mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. In Billings, during the entire year, snow falls for 64.5 days and aggregates up to 31.18" (792mm) of snow.Daylight
In Billings, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:51 pm. On the last day of September, in Billings, sunrise is at 7:12 am and sunset at 6:55 pm MDT.
Sunshine
In September, the average sunshine is 10.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 during September leads to these advisories:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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 does it start snowing?
How many hours of daylight does Billings have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Billings have in September?
What is the UV index reading in September?
Average temperature in September
Billings, MT
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (18.3°F).
Average pressure in September
Billings, MT
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Billings, MT
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in September
Billings, MT
- Average humidity in September: 44%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Billings, MT
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is July (0.71").
Average rainfall days in September
Billings, MT
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Billings, MT
- Average snowfall in September: 0.12"
The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Billings, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (13.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Billings, 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 2min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Billings, MT
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (9.9 days).
Average UV index in September
Billings, MT
- Average UV index in September: 4
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
Billings, MT
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Billings, 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).
Billings, Montana, USA
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