September weather forecast and climate
Cliff Lake, MT

Weather in September

September, the first month of the autumn, in Cliff Lake, is still a comfortable month, with average temperature fluctuating between 61.7°F (16.5°C) and 37.6°F (3.1°C).

Temperature

In September, the average high-temperature decreases, from a pleasant 71.2°F (21.8°C) in August, to an enjoyable 61.7°F (16.5°C). In September, in Cliff Lake, the average low-temperature is 37.6°F (3.1°C).

Humidity

The average relative humidity in September is 58%.

Rainfall

In September, in Cliff Lake, Montana, the rain falls for 10.5 days. Throughout September, 1.42" (36mm) of precipitation is accumulated. Throughout the year, in Cliff Lake, Montana, there are 123.8 rainfall days, and 24.53" (623mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through July, September through December. September is the first month it typically snows. Throughout September, in the average 1.9 snowfall days, it receives 2.36" (60mm) of snow. Throughout the year, there are 165.6 snowfall days, and 125.16" (3179mm) of snow is accumulated.

Daylight

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

Sunshine

The average sunshine in September is 9.8h.

UV index

The average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Cliff Lake?

In September, the average relative humidity in Cliff Lake, Montana, is 58%.

How many days does it rain in September in Cliff Lake?

In September, in Cliff Lake, the rain falls for 10.5 days. Throughout September, 1.42" (36mm) of precipitation is accumulated.

When does it start snowing in Cliff Lake?

September is the first month it typically snows in Cliff Lake, Montana. Throughout September, in the average 1.9 snowfall days, it receives 2.36" (60mm) of snow.

What is the average length of the day in September in Cliff Lake?

In Cliff Lake, the average length of the day in September is 12.5h.

How long on average sun shines in September in Cliff Lake?

In September, the average sunshine is 9.8h.

What is the UV index intensity in September in Cliff Lake?

In Cliff Lake, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Cliff Lake, MT

Average temperature in September - Cliff Lake, MT
  • Average high temperature in September: 61.7°F

The warmest month (with the highest average high temperature) is July (73.2°F).
The month with the lowest average high temperature is December (20.5°F).

  • Average low temperature in September: 37.6°F

The month with the highest average low temperature is August (43°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).

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Average pressure in September
Cliff Lake, MT

Average pressure in September - Cliff Lake, MT
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.24").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in September
Cliff Lake, MT

Average wind speed in September - Cliff Lake, MT
  • Average wind speed in September: 5.5mph

The windiest months (with the highest average wind speed) are January, February, March, June, November and December (6.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

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Average humidity in September
Cliff Lake, MT

Average humidity in September - Cliff Lake, MT
  • Average humidity in September: 58%

The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in September
Cliff Lake, MT

Average rainfall in September - Cliff Lake, MT
  • Average rainfall in September: 1.42"

The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is July (0.91").

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Average rainfall days in September
Cliff Lake, MT

Average rainfall days in September - Cliff Lake, MT
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is May (20.5 days).
The month with the least rainy days is January (4 days).

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Average snowfall in September
Cliff Lake, MT

Average snowfall in September - Cliff Lake, MT
  • Average snowfall in September: 2.36"

The month with the highest snowfall is February (20.67").
The month with the least snowfall is August (0").

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Average snowfall days in September
Cliff Lake, MT

Average snowfall days in September - Cliff Lake, MT
  • Average snowfall days in September: 1.9 days

The month with the highest number of snowfall days is March (26.4 days).
The month with the least snowfall days is August (0 days).

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Average daylight in September /
Average sunshine in September
Cliff Lake, MT

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

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 9.8h

The month with the most sunshine is July (Average sunshine: 11.7h).
Months with the least sunshine are January and February (Average sunshine: 3.6).

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Average sunshine days in September
Cliff Lake, MT

Average sunshine days in September - Cliff Lake, MT
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is May (3.8 days).

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Average UV index in September
Cliff Lake, MT

Average UV index in September - Cliff Lake, MT
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

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Average cloud cover in September
Cliff Lake, MT

Average cloud cover in September - Cliff Lake, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is February (Cloud cover 73).
Months with the least cloud cover are July and August (Cloud cover 17).

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Average visibility in September
Cliff Lake, MT

Average visibility in September - Cliff Lake, MT
  • Average visibility in September: 6mi

Months with the highest visibility are June, July, August, September and October (6mi).
Months with the lowest visibility are January and February (3mi).

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