September weather forecast
Elmo, MT

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Elmo, Montana, with temperature in the range of an average low of 41.5°F (5.3°C) and an average high of 67.1°F (19.5°C).

Temperature

The average high-temperature decreases in September, shifting from a warm 78.4°F (25.8°C) in August to a comfortable 67.1°F (19.5°C). Contrary to the day's heat, an average low-temperature of 41.5°F (5.3°C) is recorded during the nights in September.

Humidity

In Elmo, the average relative humidity in September is 61%.

Rainfall

In September, the rain falls for 10.2 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. Throughout the year, in Elmo, there are 129.8 rainfall days, and 16.42" (417mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows in Elmo. Throughout September, in the average 0.4 snowfall days, it receives 0.2" (5mm) of snow. In Elmo, Montana, during the entire year, snow falls for 117.4 days and aggregates up to 58.62" (1489mm) of snow.

Daylight

In September, the average length of the day in Elmo is 12h and 33min.
On the first day of September, sunrise is at 6:56 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:17 pm MDT.

Sunshine

In Elmo, the average sunshine in September is 9.2h.

UV index

In Elmo, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 3 during September leads to these instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in Elmo?

The average high-temperature, in September, in Elmo, is 67.1°F (19.5°C), while the average low-temperature is 41.5°F (5.3°C).

What is the average humidity in September in Elmo?

The average relative humidity in September is 61%.

How much does it rain in Elmo in September?

In September, the rain falls for 10.2 days. Throughout September, 0.98" (25mm) of precipitation is accumulated.

When does it start snowing in Elmo?

September is the first month it typically snows in Elmo, Montana. Throughout September, in the average 0.4 snowfall days, it receives 0.2" (5mm) of snow.

How many hours of daylight does Elmo have in September?

The average day length in September in Elmo is 12h and 33min.

What time are sunrise and sunset in September in Elmo?

In September, on the first day of the month, sunrise is at 6:56 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:17 pm MDT.

How many hours of sunshine does Elmo have in September?

In Elmo, the average sunshine duration in September is 9.2h.

How high is the UV index in September in Elmo?

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Elmo, MT

Average temperature in September - Elmo, MT
  • Average high temperature in September: 67.1°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in September: 41.5°F

The month with the highest average low temperature is July (48.4°F).
The coldest months (with the lowest average low temperature) are January and December (16.2°F).

Average pressure in September
Elmo, MT

Average pressure in September - Elmo, MT
  • Average pressure in September: 29.98"Hg

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

Average wind speed in September
Elmo, MT

Average wind speed in September - Elmo, MT
  • Average wind speed in September: 3.7mph

The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest months (with the lowest average wind speed) are August and December (3.6mph).

Average humidity in September
Elmo, MT

Average humidity in September - Elmo, MT
  • Average humidity in September: 61%

The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (52%).

Average rainfall in September
Elmo, MT

Average rainfall in September - Elmo, MT
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is June (1.89").
The driest month (with the least rainfall) is July (0.59").

Average rainfall days in September
Elmo, MT

Average rainfall days in September - Elmo, MT
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is April (15.9 days).
The month with the least rainy days is December (6.5 days).

Average snowfall in September
Elmo, MT

Average snowfall in September - Elmo, MT
  • Average snowfall in September: 0.2"

The month with the highest snowfall is December (12.36").
The months with the least snowfall are July and August (0").

Average snowfall days in September
Elmo, MT

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

The month with the highest number of snowfall days is January (22.3 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Elmo, MT
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in September
Elmo, MT

Average sunshine days in September - Elmo, MT
  • Average sunshine days in September: 18.6 days

The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is February (7.1 days).

Average UV index in September
Elmo, MT

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

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

Average cloud cover in September
Elmo, MT

Average cloud cover in September - Elmo, MT
  • Average cloud cover in September: 25

The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 15).

Average visibility in September
Elmo, MT

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

The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

Elmo, Montana, USA

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