September weather forecast and climate
Trego, MT

Weather in September

The first month of the autumn, September, is still a comfortable month in Trego, Montana, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 38.7°F (3.7°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 77.2°F (25.1°C) in August, to a comfortable 65.8°F (18.8°C). In September, the average low-temperature is 38.7°F (3.7°C).

Humidity

The average relative humidity is 64%.

Rainfall

In Trego, it is raining for 8.8 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 136.3 rainfall days, and 15.35" (390mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Trego. September is the first month it typically snows in Trego. Throughout September, in the average 0.4 snowfall days, it receives 0.28" (7mm) of snow. Throughout the year, there are 110.7 snowfall days, and 46.81" (1189mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12.6h.

Sunshine

In September, the average sunshine in Trego is 9.1h.

UV index

The average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Trego?

In September, the average high-temperature is 65.8°F (18.8°C), and the average low-temperature is 38.7°F (3.7°C).

What is the average humidity in September in Trego?

In Trego, Montana, the average relative humidity in September is 64%.

How much does it rain in Trego in September?

In Trego, Montana, in September, it is raining for 8.8 days, with typically 0.79" (20mm) of accumulated precipitation.

When does it start to snow in Trego?

September is the first month it typically snows in Trego. Throughout September, in the average 0.4 snowfall days, it receives 0.28" (7mm) of snow.

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

In September, the average length of the day in Trego, Montana, is 12.6h.

How many hours of sunshine does Trego have in September?

In September, the average sunshine in Trego is 9.1h.

How high is the UV index in September in Trego?

The average daily maximum UV index in September in Trego is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Trego, MT

Average temperature in September - Trego, MT
  • Average high temperature in September: 65.8°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).

  • Average low temperature in September: 38.7°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

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Average pressure in September
Trego, MT

Average pressure in September - Trego, MT
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Trego, MT

Average wind speed in September - Trego, MT
  • Average wind speed in September: 3.8mph

The windiest month (with the highest average wind speed) is June (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).

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Average humidity in September
Trego, MT

Average humidity in September - Trego, MT
  • Average humidity in September: 64%

The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Trego, MT

Average rainfall in September - Trego, MT
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days in September
Trego, MT

Average rainfall days in September - Trego, MT
  • Average rainfall days in September: 8.8 days

The month with the highest number of rainy days is April (17 days).
The month with the least rainy days is August (6.1 days).

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Average snowfall in September
Trego, MT

Average snowfall in September - Trego, MT
  • Average snowfall in September: 0.28"

The month with the highest snowfall is February (10").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Trego, MT

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

The month with the highest number of snowfall days is December (22.1 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
Trego, MT

Average daylight in September / Average sunshine in September - Trego, MT
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is August (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 3.1h).

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Average sunshine days in September
Trego, MT

Average sunshine days in September - Trego, MT
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is August (21.6 days).
The month with the least sunshine days is March (6.3 days).

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Average UV index in September
Trego, MT

Average UV index in September - Trego, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Trego, MT

Average cloud cover in September - Trego, MT
  • Average cloud cover in September: 26

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in September
Trego, MT

Average visibility in September - Trego, MT
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

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