October weather forecast
Hamilton, MT

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A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore
A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore

Weather in October

With the progression into October, Hamilton witnesses a significant change in weather, indicating a full swing into autumn. A steep decline in temperature from September’s 66.2°F (19°C) to October’s 50°F (10°C) occurs, which is characteristic of the season. Rainfall starts to increase along with a notable shift from single to double digits in snowfall, signaling the transition towards winter. As sunlight hours decline, the cloud cover increases, creating an overcast yet colorful autumn skyline. Ultimately, October ushers in a crisp, colder climate, paving the way for the winter months.

Temperature

October is marked by a significant decrease, with the average high-temperature retreating from an enjoyable 66.2°F (19°C) in September to a fresh 50°F (10°C). During October, the average low-temperature is a freezing cold 30.4°F (-0.9°C).

Humidity

The average relative humidity in October is 69%.

Rainfall

In Hamilton, in October, during 14.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Hamilton, Montana, during the entire year, the rain falls for 163.6 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Hamilton, in October, during 3.5 snowfall days, 1.54" (39mm) of snow is typically accumulated. Throughout the year, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.

Daylight

In October, the average length of the day in Hamilton is 10h and 53min.
On the first day of the month, sunrise is at 7:36 am and sunset at 7:15 pm. On the last day of October, sunrise is at 8:17 am and sunset at 6:22 pm MDT.

Sunshine

In October, the average sunshine is 7.3h.

UV index

In October, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In October, the average maximum UV index of 2 translates into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average October temperature?

In October, in Hamilton, the average high-temperature is 50°F (10°C), and the average low-temperature is 30.4°F (-0.9°C).

What is the average humidity in October?

The average relative humidity in October is 69%.

How much does it rain in October?

In Hamilton, during October, the rain falls for 14.5 days and regularly aggregates up to 1.46" (37mm) of precipitation.

How much does it snow in October?

In October, in Hamilton, Montana, it is snowing for 3.5 days. Throughout October, 1.54" (39mm) of snow is accumulated.

How many hours of daylight does Hamilton have in October?

In Hamilton, the average day length in October is 10h and 53min.

When is the sunrise / sunset in October?

On the first day of October, sunrise is at 7:36 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 8:17 am and sunset at 6:22 pm MDT.

How many hours of sunshine does Hamilton have in October?

The average sunshine duration in October in Hamilton is 7.3h.

How high is the UV index in October?

In Hamilton, the average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a low health threat from unsafe 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 October
Hamilton, MT

Average temperature in October - Hamilton, MT
  • Average high temperature in October: 50°F

The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).

  • Average low temperature in October: 30.4°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).

Average pressure in October
Hamilton, MT

Average pressure in October - Hamilton, MT
  • Average pressure in October: 30.06"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in October
Hamilton, MT

Average wind speed in October - Hamilton, MT
  • Average wind speed in October: 4.8mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

Average humidity in October
Hamilton, MT

Average humidity in October - Hamilton, MT
  • Average humidity in October: 69%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).

Average rainfall in October
Hamilton, MT

Average rainfall in October - Hamilton, MT
  • Average rainfall in October: 1.46"

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

Average rainfall days in October
Hamilton, MT

Average rainfall days in October - Hamilton, MT
  • Average rainfall days in October: 14.5 days

The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).

Average snowfall in October
Hamilton, MT

Average snowfall in October - Hamilton, MT
  • Average snowfall in October: 1.54"

The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").

Average snowfall days in October
Hamilton, MT

Average snowfall days in October - Hamilton, MT
  • Average snowfall days in October: 3.5 days

The month with the highest number of snowfall days is February (19.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in October /
Average sunshine in October
Hamilton, MT

Average daylight in October / Average sunshine in October - Hamilton, MT
  • Average daylight in October: 10h and 5min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in October: 7h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

Average sunshine days in October
Hamilton, MT

Average sunshine days in October - Hamilton, MT
  • Average sunshine days in October: 13.1 days

The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).

Average UV index in October
Hamilton, MT

Average UV index in October - Hamilton, MT
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in October
Hamilton, MT

Average cloud cover in October - Hamilton, MT
  • Average cloud cover in October: 31

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in October
Hamilton, MT

Average visibility in October - Hamilton, MT
  • Average visibility in October: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).

Hamilton, Montana, USA

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