September weather forecast
Glendive, MT

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The calm Yellowstone River running under a bridge through a vast industrial landscape, in Glendive, Montana
The calm Yellowstone River running under a bridge through a vast industrial landscape, in Glendive, Montana

Weather in September

September initiates the gradual transition from summer to fall in Glendive, Montana. The summer heat recedes, paving the way for cooler temperatures. The daylight hours decrease, marking shorter days and longer nights. The progression from September to October witnesses a sharp fall in the daily high temperatures. The month records a significant drop in the average high temperature from 83.7°F (28.7°C) in August to 73.2°F (22.9°C), indicating the beginning of autumn.

Temperature

The start of September comes with a reduction in the average high-temperature, receding from a warm 83.7°F (28.7°C) in August to an agreeable 73.2°F (22.9°C). Throughout the month of September, Glendive reports a steady low-temperature average of 54.7°F (12.6°C).

Humidity

In September, the average relative humidity is 46%.

Rainfall

In Glendive, during September, the rain falls for 7.8 days and regularly aggregates up to 1.5" (38mm) of precipitation. Throughout the year, there are 89.5 rainfall days, and 10.59" (269mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of September, sunrise is at 6:19 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:39 pm MDT.

Sunshine

The average sunshine in September is 10.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 4 during September translates into the following guidance:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In September, the average high-temperature and low-temperature are 73.2°F (22.9°C) and 54.7°F (12.6°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, is computed to be 84.2°F (29°C).

What is the average humidity in September in Glendive?

In September, the average relative humidity is 46%.

How many days does it rain in September?

In Glendive, in September, it is raining for 7.8 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Glendive have in September?

The average day length in September is 12h and 32min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:19 am and sunset at 7:37 pm. On the last day of the month, in Glendive, sunrise is at 6:57 am and sunset at 6:39 pm MDT.

How long on average sun shines in September?

In September, the average sunshine duration in Glendive, Montana, is 10.3h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
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
Glendive, MT

Average temperature in September - Glendive, MT
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (25.9°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

Average pressure in September
Glendive, MT

Average pressure in September - Glendive, MT
  • Average pressure in September: 29.92"Hg

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

Average wind speed in September
Glendive, MT

Average wind speed in September - Glendive, 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).

Average humidity in September
Glendive, MT

Average humidity in September - Glendive, 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%).

Average rainfall in September
Glendive, MT

Average rainfall in September - Glendive, MT
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is May (1.73").
The driest months (with the least rainfall) are January, March and November (0.35").

Average rainfall days in September
Glendive, MT

Average rainfall days in September - Glendive, MT
  • Average rainfall days in September: 7.8 days

The month with the highest number of rainy days is June (12.1 days).
The month with the least rainy days is February (3.1 days).

Average snowfall in September
Glendive, MT

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

The month with the highest snowfall is February (2.68").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Glendive, MT

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

The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 10h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

Average sunshine days in September
Glendive, MT

Average sunshine days in September - Glendive, MT
  • Average sunshine days in September: 20 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (14.9 days).

Average UV index in September
Glendive, MT

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

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

Average cloud cover in September
Glendive, MT

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

The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 17).

Average visibility in September
Glendive, MT

Average visibility in September - Glendive, 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).

Glendive, Montana, USA

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