September weather forecast and climate
Terry, MT

Weather in September

The first month of the autumn, September, is still a pleasant month in Terry, Montana, with average temperature varying between 73°F (22.8°C) and 54.5°F (12.5°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 83.3°F (28.5°C) in August, to a pleasant 73°F (22.8°C). The average low-temperature,, is 54.5°F (12.5°C).

Humidity

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

Rainfall

In September, the rain falls for 8.3 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. In Terry, during the entire year, the rain falls for 102.6 days and collects up to 13.35" (339mm) of precipitation.

Snowfall

June through September are months without snowfall in Terry.

Daylight

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

Sunshine

In Terry, the average sunshine is 10.2h.

UV index

In September, the average daily maximum UV index in Terry is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Terry?

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

How many days does it rain in September in Terry?

In Terry, during September, the rain falls for 8.3 days and regularly aggregates up to 1.73" (44mm) of precipitation.

When it does not snow in Terry?

June through September are months without snowfall in Terry, Montana.

Does it snow in Terry in September?

In Terry, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Terry have in September?

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

How long on average sun shines in September in Terry?

In September, the average sunshine is 10.2h.

How high is the UV index in September in Terry?

In September, the average daily maximum UV index in Terry, Montana, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Terry, MT

Average temperature in September - Terry, MT
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (25.5°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

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Average pressure in September
Terry, MT

Average pressure in September - Terry, MT
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is February (30.16").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed in September
Terry, MT

Average wind speed in September - Terry, MT
  • Average wind speed in September: 10.3mph

The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).

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Average humidity in September
Terry, MT

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

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in September
Terry, MT

Average rainfall in September - Terry, MT
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is January (0.51").

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Average rainfall days in September
Terry, MT

Average rainfall days in September - Terry, MT
  • Average rainfall days in September: 8.3 days

The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is February (4 days).

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Average snowfall in September
Terry, MT

Average snowfall in September - Terry, MT
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.62").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Terry, MT

Average snowfall days in September - Terry, MT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.9 days).
Months with the least snowfall days are July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Terry, MT

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

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 10.2h

The month with the most sunshine is July (Average sunshine: 11.7h).
Months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in September
Terry, MT

Average sunshine days in September - Terry, MT
  • Average sunshine days in September: 19.8 days

The month with the most sunshine days is September (19.8 days).
The month with the least sunshine days is June (13.1 days).

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Average UV index in September
Terry, MT

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

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are November and December (UV index 1).

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Average cloud cover in September
Terry, MT

Average cloud cover in September - Terry, MT
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 49).
Months with the least cloud cover are July and August (Cloud cover 17).

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Average visibility in September
Terry, MT

Average visibility in September - Terry, 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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