September weather forecast
Carter, MT

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Weather in September

September, the first month of the autumn in Carter, is also an agreeable month, with an average temperature ranging between min 52.2°F (11.2°C) and max 70.7°F (21.5°C).

Temperature

Carter experiences a temperature shift at the start of September, with average high-temperatures adjusting from a moderately hot 81.9°F (27.7°C) in August to a pleasant 70.7°F (21.5°C). Carter, in September, observes a steady average low-temperature of 52.2°F (11.2°C).

Humidity

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

Rainfall

In Carter, during September, the rain falls for 9.4 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, there are 119.1 rainfall days, and 13.43" (341mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Carter are January through May, September through December. September is the first month it typically snows in Carter. 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

The average length of the day in September is 12h and 33min.
On the first day of the month, sunrise is at 6:43 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:22 am and sunset at 7:04 pm MDT.

Sunshine

In September, the average sunshine in Carter is 9.9h.

UV index

In Carter, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: An average maximum UV index of 4 in September leads to these recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Updated: Feb 13, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What are September temperatures in Carter?

The average high-temperature and low-temperature during September are 70.7°F (21.5°C) and 52.2°F (11.2°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is evaluated at 82.4°F (28°C).

What is the average humidity in September in Carter?

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

How much does it rain in Carter in September?

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?

In Carter, Montana, the average day length in September is 12h and 33min.

What time are sunrise and sunset in September in Carter?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 8:03 pm. On the last day of the month, in Carter, sunrise is at 7:22 am and sunset at 7:04 pm MDT.

How long on average sun shines in September in Carter?

In Carter, Montana, the average sunshine duration in September is 9.9h.

What is the UV index reading in September in Carter?

In Carter, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
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"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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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").
The 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).
The 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: 12h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 30min).

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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

The months with the highest UV index are June and July (UV index 6).
The 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

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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Carter, Montana, USA

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