September weather forecast
Stevensville, MT

Share

Weather in September

The first month of the autumn, September, is still a pleasant month in Stevensville, Montana, with an average temperature fluctuating between 42.1°F (5.6°C) and 68°F (20°C).

Temperature

Stevensville in September experiences a subtle temperature decline, with average high-temperatures reducing from a warm 77.5°F (25.3°C) in August to a pleasant 68°F (20°C). Contrary to the day's heat, an average low-temperature of 42.1°F (5.6°C) is recorded during the nights in September in Stevensville.

Humidity

In September, the average relative humidity is 56%.

Rainfall

In Stevensville, in September, during 7 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. Throughout the year, there are 140.1 rainfall days, and 15.16" (385mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, in Stevensville, there are 87.7 snowfall days, and 46.5" (1181mm) of snow is accumulated.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 6:57 am and sunset at 8:14 pm. On the last day of September, sunrise is at 7:34 am and sunset at 7:17 pm MDT.

Sunshine

In Stevensville, the average sunshine in September is 9.5h.

UV index

The average daily maximum UV index in September in Stevensville, Montana, is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 3 in September suggests the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
[Resources]

Frequently asked questions

What is the average September temperature in Stevensville?

The average high-temperature, in September, in Stevensville, is 68°F (20°C), while the average low-temperature is 42.1°F (5.6°C).

What is the average humidity in September in Stevensville?

In September, the average relative humidity in Stevensville, Montana, is 56%.

How much does it rain in Stevensville in September?

In Stevensville, in September, during 7 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

When does it start snowing in Stevensville?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.2" (5mm) of snow.

How many hours of daylight does Stevensville have in September?

In Stevensville, the average day length in September is 12h and 32min.

When is the sunrise / sunset in September in Stevensville?

In September, on the first day of the month, sunrise is at 6:57 am and sunset at 8:14 pm. On the last day of the month, in Stevensville, Montana, sunrise is at 7:34 am and sunset at 7:17 pm MDT.

How long on average sun shines in September in Stevensville?

In September, the average sunshine duration in Stevensville, Montana, is 9.5h.

How high is the UV index in September in Stevensville?

In Stevensville, Montana, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Stevensville, MT

Average temperature in September - Stevensville, MT
  • Average high temperature in September: 68°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in September: 42.1°F

The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (16°F).

[Resources]

Average pressure in September
Stevensville, MT

Average pressure in September - Stevensville, MT
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

[Resources]

Average wind speed in September
Stevensville, MT

Average wind speed in September - Stevensville, MT
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is January (5.4mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

[Resources]

Average humidity in September
Stevensville, MT

Average humidity in September - Stevensville, MT
  • Average humidity in September: 56%

The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (49%).

[Resources]

Average rainfall in September
Stevensville, MT

Average rainfall in September - Stevensville, MT
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is February (1.93").
The driest months (with the least rainfall) are July and August (0.43").

[Resources]

Average rainfall days in September
Stevensville, MT

Average rainfall days in September - Stevensville, MT
  • Average rainfall days in September: 7 days

The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is August (5.3 days).

[Resources]

Average snowfall in September
Stevensville, MT

Average snowfall in September - Stevensville, MT
  • Average snowfall in September: 0.2"

The month with the highest snowfall is February (11.22").
The months with the least snowfall are June, July and August (0").

[Resources]

Average snowfall days in September
Stevensville, MT

Average snowfall days in September - Stevensville, MT
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is February (17.3 days).
The months with the least snowfall days are June, July and August (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Stevensville, 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 42min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).

[Resources]

Average sunshine days in September
Stevensville, MT

Average sunshine days in September - Stevensville, MT
  • Average sunshine days in September: 21.5 days

The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is February (6.9 days).

[Resources]

Average UV index in September
Stevensville, MT

Average UV index in September - Stevensville, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).

[Resources]

Average cloud cover in September
Stevensville, MT

Average cloud cover in September - Stevensville, MT
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 13).

[Resources]

Average visibility in September
Stevensville, MT

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

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

[Resources]

Stevensville, Montana, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location