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
The shift from August to September involves a decrease in the average high-temperature, from a warm 82.8°F (28.2°C) to an agreeable 72.7°F (22.6°C). In Mosby, September nights witness a steady temperature drop to a cool 53.2°F (11.8°C).Humidity
In September, the average relative humidity is 44%.Rainfall
In Mosby, in September, during 8 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. In Mosby, during the entire year, the rain falls for 114.3 days and collects up to 12.13" (308mm) 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 0.3 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:52 pm MDT.
Sunshine
In Mosby, the average sunshine in September is 10.2h.UV index
The average daily maximum UV index in September in Mosby, Montana, is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Experience reduced UV exposure by about half when donning a wide-brim hat. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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 many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
What time are sunrise and sunset in September in Mosby?
How many hours of sunshine does Mosby have in September?
What is the UV index intensity in September?
Average temperature in September
Mosby, MT
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in September
Mosby, 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
Mosby, MT
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in September
Mosby, MT
- Average humidity in September: 44%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Mosby, MT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Mosby, MT
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Mosby, MT
- Average snowfall in September: 0.12"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Mosby, MT
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Mosby, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 12min).
Average sunshine days in September
Mosby, MT
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in September
Mosby, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Mosby, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Mosby, 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).
Mosby, Montana, USA
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