September weather forecast and climate
Carter, MT

Weather in September

The first month of the autumn, September, is still a pleasant month in Carter, Montana, with average temperature fluctuating between 52.2°F (11.2°C) and 70.7°F (21.5°C).

Temperature

In September, the average high-temperature drops, from a moderately hot 81.9°F (27.7°C) in August, to a pleasant 70.7°F (21.5°C). In September, the average low-temperature is 52.2°F (11.2°C).

Humidity

In Carter, the average relative humidity is 46%.

Rainfall

In Carter, it is raining for 9.4 days, with typically 1.14" (29mm) of accumulated precipitation. Throughout the year, in Carter, Montana, there are 119.1 rainfall days, and 13.43" (341mm) 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 0.4 snowfall days, it receives 0.94" (24mm) of snow. In Carter, during the entire year, snow falls for 58.3 days, and aggregates up to 29.37" (746mm) of snow.

Daylight

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

Sunshine

In September, the average sunshine is 9.9h.

UV index

The average daily maximum UV index in Carter is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 temperature in September in Carter?

In Carter, Montana, in September, the average high-temperature is 70.7°F (21.5°C), and the average low-temperature is 52.2°F (11.2°C).

What is the average humidity in September in Carter?

In Carter, Montana, the average relative humidity in September is 46%.

How many days does it rain in September in Carter?

In Carter, Montana, in September, it is raining for 9.4 days, with typically 1.14" (29mm) of accumulated precipitation.

When does it start to snow in Carter?

September is the first month it typically snows in Carter, Montana. Throughout September, in the average 0.4 snowfall days, it receives 0.94" (24mm) of snow.

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

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

How long on average sun shines in September in Carter?

The average sunshine in September in Carter, Montana, is 9.9h.

What is the UV index intensity in September in Carter?

In September, the average daily maximum UV index in Carter, Montana, is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Carter, MT

Average temperature in September - Carter, MT
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (29.8°F).

  • Average low temperature in September: 52.2°F

The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is February (18.1°F).

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Average pressure in September
Carter, MT

Average pressure in September - Carter, MT
  • Average pressure in September: 29.94"

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
Carter, MT

Average wind speed in September - Carter, MT
  • Average wind speed in September: 8.9mph

The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).

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Average humidity in September
Carter, MT

Average humidity in September - Carter, MT
  • Average humidity in September: 46%

The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in September
Carter, MT

Average rainfall in September - Carter, MT
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is June (2.05").
The driest month (with the least rainfall) is December (0.67").

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Average rainfall days in September
Carter, MT

Average rainfall days in September - Carter, MT
  • Average rainfall days in September: 9.4 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall in September
Carter, MT

Average snowfall in September - Carter, MT
  • Average snowfall in September: 0.94"

The month with the highest snowfall is February (5.51").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Carter, MT

Average snowfall days in September - Carter, MT
  • Average snowfall days in September: 0.4 days

The month with the highest number of snowfall days is February (12.2 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
Carter, MT

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

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is July (Average sunshine: 12h).
Months with the least sunshine are January, February and December (Average sunshine: 5.5).

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Average sunshine days in September
Carter, MT

Average sunshine days in September - Carter, MT
  • Average sunshine days in September: 19.3 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (11.2 days).

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Average UV index in September
Carter, MT

Average UV index in September - Carter, MT
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Carter, MT

Average cloud cover in September - Carter, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Carter, MT

Average visibility in September - Carter, 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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