September weather forecast
Willow Creek, MT

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Weather in September

The first month of the autumn, September, is still a pleasant month in Willow Creek, Montana, with temperature in the range of an average low of 44.4°F (6.9°C) and an average high of 70.9°F (21.6°C).

Temperature

September indicates a shift in the average high-temperature, from August's warm 81.9°F (27.7°C) to a pleasant 70.9°F (21.6°C). In Willow Creek, September nights witness a remarkable decline from the day's zenith to a frosty 44.4°F (6.9°C).

Humidity

In September, the average relative humidity in Willow Creek is 49%.

Rainfall

In September, the rain falls for 8.4 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. Throughout the year, in Willow Creek, there are 134.2 rainfall days, and 11.34" (288mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows in Willow Creek. Throughout September, in the average 0.5 snowfall days, it receives 0.83" (21mm) of snow. In Willow Creek, during the entire year, snow falls for 79.6 days and aggregates up to 30.08" (764mm) of snow.

Daylight

In Willow Creek, the average length of the day in September is 12h and 31min.
On the first day of September, sunrise is at 6:48 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:07 pm MDT.

Sunshine

The average sunshine in September in Willow Creek is 10h.

UV index

In September, the average daily maximum UV index in Willow Creek is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 3 in September translates into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. To protect against the Sun's most potent rays, avoid direct exposure around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
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Frequently asked questions

What is the usual temperature for Willow Creek in September?

In September, the average high-temperature and low-temperature in Willow Creek are 70.9°F (21.6°C) and 44.4°F (6.9°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is computed to be 82.4°F (28°C).

What is the average humidity in September in Willow Creek?

The average relative humidity in September is 49%.

How much does it rain in Willow Creek in September?

In Willow Creek, Montana, in September, it is raining for 8.4 days, with typically 0.91" (23mm) of accumulated precipitation.

When does it start snowing in Willow Creek?

September is the first month it typically snows in Willow Creek. Throughout September, in the average 0.5 snowfall days, it receives 0.83" (21mm) of snow.

What is the average length of the day in September in Willow Creek?

The average day length in September is 12h and 31min.

What time are sunrise and sunset in September in Willow Creek?

In September, on the first day of the month, sunrise is at 6:48 am and sunset at 8:04 pm. On the last day of the month, in Willow Creek, sunrise is at 7:24 am and sunset at 7:07 pm MDT.

How many hours of sunshine does Willow Creek have in September?

In September, the average sunshine duration in Willow Creek, Montana, is 10h.

How high is the UV index in September in Willow Creek?

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

Average temperature in September
Willow Creek, MT

Average temperature in September - Willow Creek, MT
  • Average high temperature in September: 70.9°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28°F).

  • Average low temperature in September: 44.4°F

The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (12.7°F).

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Average pressure in September
Willow Creek, MT

Average pressure in September - Willow Creek, MT
  • Average pressure in September: 29.98"Hg

The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in September
Willow Creek, MT

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

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

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Average humidity in September
Willow Creek, MT

Average humidity in September - Willow Creek, MT
  • Average humidity in September: 49%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (44%).

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Average rainfall in September
Willow Creek, MT

Average rainfall in September - Willow Creek, MT
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is June (1.57").
The driest month (with the least rainfall) is August (0.51").

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Average rainfall days in September
Willow Creek, MT

Average rainfall days in September - Willow Creek, MT
  • Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is April (16.5 days).
The month with the least rainy days is August (7.6 days).

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Average snowfall in September
Willow Creek, MT

Average snowfall in September - Willow Creek, MT
  • Average snowfall in September: 0.83"

The month with the highest snowfall is February (6.02").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Willow Creek, MT

Average snowfall days in September - Willow Creek, MT
  • Average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is February (16.5 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Willow Creek, MT

Average daylight in September / Average sunshine in September - Willow Creek, 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 0min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).

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Average sunshine days in September
Willow Creek, MT

Average sunshine days in September - Willow Creek, MT
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is September (18.7 days).
The month with the least sunshine days is April (9.3 days).

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Average UV index in September
Willow Creek, MT

Average UV index in September - Willow Creek, 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 December (UV index 1).

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Average cloud cover in September
Willow Creek, MT

Average cloud cover in September - Willow Creek, MT
  • Average cloud cover in September: 20

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
Willow Creek, MT

Average visibility in September - Willow Creek, MT
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

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Willow Creek, Montana, USA

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