September weather forecast and climate
Mosby, MT

Weather in September

September, the first month of the autumn, in Mosby, is also an agreeable month, with average temperature varying between 53.2°F (11.8°C) and 72.7°F (22.6°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 82.8°F (28.2°C) in August, to an agreeable 72.7°F (22.6°C). In September, the average low-temperature is 53.2°F (11.8°C).

Humidity

In September, the average relative humidity is 44%.

Rainfall

In Mosby, in September, it is raining for 8 days, with typically 0.94" (24mm) of accumulated precipitation. Throughout the year, there are 114.3 rainfall days, and 12.13" (308mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Mosby. 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, in Mosby, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.

Daylight

The average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 10.2h.

UV index

In Mosby, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Mosby?

In Mosby, the average relative humidity in September is 44%.

How many days does it rain in September in Mosby?

In Mosby, during September, the rain falls for 8 days and regularly aggregates up to 0.94" (24mm) of precipitation.

When does it start snowing in Mosby?

September is the first month it typically snows in Mosby. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow.

What is the average length of the day in September in Mosby?

The average length of the day in September in Mosby, Montana, is 12.5h.

How long on average sun shines in September in Mosby?

In Mosby, Montana, the average sunshine in September is 10.2h.

What is the UV index reading in September in Mosby?

The average daily maximum UV index in September in Mosby is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Mosby, MT

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).

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Average pressure in September
Mosby, MT

Average pressure in September - Mosby, MT
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in September
Mosby, MT

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).

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Average humidity in September
Mosby, MT

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%).

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Average rainfall in September
Mosby, MT

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").

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Average rainfall days in September
Mosby, MT

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).

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Average snowfall in September
Mosby, MT

Average snowfall in September - Mosby, MT
  • Average snowfall in September: 0.12"

The month with the highest snowfall is February (3.78").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Mosby, MT

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).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Mosby, MT

Average daylight in September / Average sunshine in September - Mosby, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 10.2h

The month with the most sunshine is July (Average sunshine: 11.8h).
Months with the least sunshine are February and December (Average sunshine: 5.2).

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Average sunshine days in September
Mosby, MT

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).

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Average UV index in September
Mosby, MT

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).

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Average cloud cover in September
Mosby, MT

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).
Months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in September
Mosby, MT

Average visibility in September - Mosby, MT
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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