September weather forecast
Augusta, MT

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Weather in September

September, the first month of the autumn in Augusta, is also an agreeable month, with an average temperature fluctuating between 68.2°F (20.1°C) and 48.6°F (9.2°C).

Temperature

The shift from August to September involves a decrease in the average high-temperature, dropping from a warm 79°F (26.1°C) to a pleasant 68.2°F (20.1°C). In Augusta, the average low-temperature during the month of September is a frosty 48.6°F (9.2°C).

Humidity

In September, the average relative humidity is 48%.

Rainfall

In September, the rain falls for 6.1 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. In Augusta, during the entire year, the rain falls for 73.3 days and collects up to 9.17" (233mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow. In Augusta, during the entire year, snow falls for 50.3 days and aggregates up to 21.26" (540mm) of snow.

Daylight

In Augusta, the average length of the day in September is 12h and 33min.
On the first day of the month, sunrise is at 6:49 am and sunset at 8:09 pm. On the last day of September, sunrise is at 7:28 am and sunset at 7:10 pm MDT.

Sunshine

In September, the average sunshine is 9.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Exercise prevention - Precautions against solar damage are endorsed. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Updated: Jul 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Augusta in September?

The average high-temperature and low-temperature in Augusta during September are 68.2°F (20.1°C) and 48.6°F (9.2°C) respectively.

What is the average humidity in September?

In September, the average relative humidity is 48%.

How much does it rain in September?

In Augusta, during September, the rain falls for 6.1 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When does it start snowing?

September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow.

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:49 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:10 pm MDT.

How long on average sun shines in September?

In Augusta, the average sunshine duration in September is 9.7h.

What is the UV index intensity in September?

The average daily maximum UV index in September 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
Augusta, MT

Average temperature in September - Augusta, MT
  • Average high temperature in September: 68.2°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (28.8°F).

  • Average low temperature in September: 48.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).

Average pressure in September
Augusta, MT

Average pressure in September - Augusta, MT
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in September
Augusta, MT

Average wind speed in September - Augusta, MT
  • Average wind speed in September: 8.8mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8mph).

Average humidity in September
Augusta, MT

Average humidity in September - Augusta, MT
  • Average humidity in September: 48%

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (42%).

Average rainfall in September
Augusta, MT

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

The wettest month (with the highest rainfall) is June (1.93").
The driest month (with the least rainfall) is December (0.35").

Average rainfall days in September
Augusta, MT

Average rainfall days in September - Augusta, MT
  • Average rainfall days in September: 6.1 days

The month with the highest number of rainy days is May (11.3 days).
The month with the least rainy days is November (2.7 days).

Average snowfall in September
Augusta, MT

Average snowfall in September - Augusta, MT
  • Average snowfall in September: 0.55"

The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Augusta, MT

Average snowfall days in September - Augusta, MT
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Augusta, MT
  • Average daylight in September: 12h and 3min

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 4min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

Average sunshine days in September
Augusta, MT

Average sunshine days in September - Augusta, MT
  • Average sunshine days in September: 21 days

The month with the most sunshine days is October (23.2 days).
The month with the least sunshine days is February (15.8 days).

Average UV index in September
Augusta, MT

Average UV index in September - Augusta, 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).

Average cloud cover in September
Augusta, MT

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

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 14).

Average visibility in September
Augusta, MT

Average visibility in September - Augusta, 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).

Augusta, Montana, USA

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