September weather forecast
Rim Rock Colony, MT

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Weather in September

September, the first month of the autumn in Rim Rock Colony, is still a refreshing month, with an average temperature varying between 67.6°F (19.8°C) and 48.4°F (9.1°C).

Temperature

September brings a decrease in the average high-temperature, falling from August's moderately hot 78.1°F (25.6°C) to a comfortable 67.6°F (19.8°C). During September, Rim Rock Colony witnesses a consistent average low-temperature of 48.4°F (9.1°C).

Humidity

In September, the average relative humidity in Rim Rock Colony, Montana, is 49%.

Rainfall

In Rim Rock Colony, in September, it is raining for 6.2 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.8 snowfall days, it receives 0.51" (13mm) of snow. In Rim Rock Colony, during the entire year, snow falls for 54.3 days and aggregates up to 19.49" (495mm) of snow.

Daylight

In Rim Rock Colony, the average length of the day in September is 12h and 34min.
On the first day of the month, sunrise is at 6:46 am and sunset at 8:09 pm. On the last day of September, in Rim Rock Colony, sunrise is at 7:27 am and sunset at 7:08 pm MDT.

Sunshine

In September, the average sunshine is 9.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: An average maximum UV index of 4 in September leads to these recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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Frequently asked questions

What are September temperatures in Rim Rock Colony?

During September, Rim Rock Colony experiences an average high-temperature of 67.6°F (19.8°C) and a low-temperature of 48.4°F (9.1°C).

What is the average humidity in September in Rim Rock Colony?

In September, the average relative humidity is 49%.

How many days does it rain in September in Rim Rock Colony?

In Rim Rock Colony, Montana, in September, it is raining for 6.2 days, with typically 0.71" (18mm) of accumulated precipitation.

When does it start to snow in Rim Rock Colony?

September is the first month it typically snows in Rim Rock Colony. Throughout September, in the average 0.8 snowfall days, it receives 0.51" (13mm) of snow.

What is the average length of the day in September in Rim Rock Colony?

In September, the average day length in Rim Rock Colony is 12h and 34min.

What time are sunrise and sunset in September in Rim Rock Colony?

On the first day of September in Rim Rock Colony, sunrise is at 6:46 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:08 pm MDT.

How long on average sun shines in September in Rim Rock Colony?

The average sunshine duration in September is 9.6h.

How high is the UV index in September in Rim Rock Colony?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from 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
Rim Rock Colony, MT

Average temperature in September - Rim Rock Colony, MT
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in September: 48.4°F

The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).

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Average pressure in September
Rim Rock Colony, MT

Average pressure in September - Rim Rock Colony, MT
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Rim Rock Colony, MT

Average wind speed in September - Rim Rock Colony, MT
  • Average wind speed in September: 9.5mph

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).

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Average humidity in September
Rim Rock Colony, MT

Average humidity in September - Rim Rock Colony, MT
  • Average humidity in September: 49%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in September
Rim Rock Colony, MT

Average rainfall in September - Rim Rock Colony, MT
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in September
Rim Rock Colony, MT

Average rainfall days in September - Rim Rock Colony, MT
  • Average rainfall days in September: 6.2 days

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

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Average snowfall in September
Rim Rock Colony, MT

Average snowfall in September - Rim Rock Colony, MT
  • Average snowfall in September: 0.51"

The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Rim Rock Colony, MT

Average snowfall days in September - Rim Rock Colony, MT
  • Average snowfall days in September: 0.8 days

The month with the highest number of snowfall days is December (10.2 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
Rim Rock Colony, MT

Average daylight in September / Average sunshine in September - Rim Rock Colony, MT
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).

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Average sunshine days in September
Rim Rock Colony, MT

Average sunshine days in September - Rim Rock Colony, MT
  • Average sunshine days in September: 22.4 days

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

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Average UV index in September
Rim Rock Colony, MT

Average UV index in September - Rim Rock Colony, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Rim Rock Colony, MT

Average cloud cover in September - Rim Rock Colony, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).

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Average visibility in September
Rim Rock Colony, MT

Average visibility in September - Rim Rock Colony, 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).

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Rim Rock Colony, Montana, USA

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