October weather forecast
Great Falls, MT

A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana
A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana

Weather in October

October, the same as September, is another fresh autumn month in Great Falls, Montana, with average temperature fluctuating between 37.8°F (3.2°C) and 54.5°F (12.5°C).

Temperature

In Great Falls, the average high-temperature declines considerably, from an agreeable 71.2°F (21.8°C) in September, to a fresh 54.5°F (12.5°C). In October, in Great Falls, the average low-temperature is 37.8°F (3.2°C).

Humidity

The average relative humidity in Great Falls is 59%.

Rainfall

In Great Falls, Montana, in October, it is raining for 5.8 days, with typically 0.28" (7mm) of accumulated precipitation. Throughout the year, there are 68.2 rainfall days, and 4.49" (114mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In Great Falls, during October, snow falls for 2.8 days and regularly aggregates up to 0.91" (23mm) of snow. Throughout the year, in Great Falls, there are 45.4 snowfall days, and 11.61" (295mm) of snow is accumulated.

Daylight

In October, the average length of the day in Great Falls, Montana, is 10.8h.

Sunshine

The average sunshine is 6.5h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Great Falls, Montana. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in October transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in October in Great Falls?

In Great Falls, the average relative humidity in October is 59%.

How many days does it rain in October in Great Falls?

In Great Falls, in October, it is raining for 5.8 days, with typically 0.28" (7mm) of accumulated precipitation.

How much does it snow in Great Falls in October?

In Great Falls, in October, snow falls for 2.8 days, with typically accumulated 0.91" (23mm) of snow.

How many hours of daylight does Great Falls have in October?

In October, the average length of the day is 10.8h.

How long on average sun shines in October in Great Falls?

In Great Falls, Montana, the average sunshine in October is 6.5h.

When is the lowest UV index in Great Falls?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in October in Great Falls?

The average daily maximum UV index in October in Great Falls, Montana, is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in October
Great Falls, MT

Average temperature in October - Great Falls, MT
  • Average high temperature in October: 12.5°C

The warmest month (with the highest average high temperature) is July (28.4°C).
The month with the lowest average high temperature is December (-1.1°C).

  • Average low temperature in October: 3.2°C

The month with the highest average low temperature is August (14.3°C).
The coldest months (with the lowest average low temperature) are February and December (-7.6°C).

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Average pressure in October
Great Falls, MT

Average pressure in October - Great Falls, MT
  • Average pressure in October: 1016.2mbar

The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is June (1011.5mbar).

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Average wind speed in October
Great Falls, MT

Average wind speed in October - Great Falls, MT
  • Average wind speed in October: 15.9km/h

The windiest month (with the highest average wind speed) is November (18.3km/h).
The calmest month (with the lowest average wind speed) is August (12.4km/h).

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Average humidity in October
Great Falls, MT

Average humidity in October - Great Falls, MT
  • Average humidity in October: 59%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in October
Great Falls, MT

Average rainfall in October - Great Falls, MT
  • Average rainfall in October: 7mm

The wettest month (with the highest rainfall) is June (22mm).
The driest month (with the least rainfall) is December (4mm).

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Average rainfall days in October
Great Falls, MT

Average rainfall days in October - Great Falls, MT
  • Average rainfall days in October: 5.8 days

The month with the highest number of rainy days is April (9.9 days).
The month with the least rainy days is December (2.7 days).

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Average snowfall in October
Great Falls, MT

Average snowfall in October - Great Falls, MT
  • Average snowfall in October: 23mm

The month with the highest snowfall is February (53mm).
Months with the least snowfall are June, July and August (0mm).

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Average snowfall days in October
Great Falls, MT

Average snowfall days in October - Great Falls, MT
  • Average snowfall days in October: 2.8 days

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

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Average daylight in October /
Average sunshine in October
Great Falls, MT

Average daylight in October / Average sunshine in October - Great Falls, MT
  • Average daylight in October: 10.8h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in October: 6.5h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 5.5).

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Average sunshine days in October
Great Falls, MT

Average sunshine days in October - Great Falls, MT
  • Average sunshine days in October: 21.9 days

The month with the most sunshine days is July (26.1 days).
Months with the least sunshine days are February and April (16.2 days).

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Average UV index in October
Great Falls, MT

Average UV index in October - Great Falls, MT
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in October
Great Falls, MT

Average cloud cover in October - Great Falls, MT
  • Average cloud cover in October: 30

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in October
Great Falls, MT

Average visibility in October - Great Falls, MT
  • Average visibility in October: 10km

Months with the highest visibility are April, May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, November and December (9km).

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