October weather forecast and climate
Helena, MT

The State Capital building of Montana in Helena city, set on a beautiful natural park
The State Capital building of Montana in Helena city, set on a beautiful natural park
October, the same as September, is a cool autumn month in Helena, Montana, with average temperature ranging between max 51.3°F (10.7°C) and min 32.7°F (0.4°C).

Temperature

In Helena, the average high-temperature in October declines considerably, from an agreeable 68.2°F (20.1°C) in September, to a cool 51.3°F (10.7°C). In October, the average low-temperature is 32.7°F (0.4°C).

Humidity

The average relative humidity in October is 64%.

Rainfall

In Helena, during 10 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Helena, Montana, during the entire year, the rain falls for 123.7 days and collects up to 12.4" (315mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. In Helena, during October, snow falls for 4.6 days and regularly aggregates up to 2.72" (69mm) of snow. In Helena, during the entire year, snow falls for 80.4 days, and aggregates up to 34.88" (886mm) of snow.

Daylight

In Helena, the average length of the day is 10.9h.

Sunshine

In Helena, the average sunshine in October is 7h.

UV index

The average daily maximum UV index in October is 2. A UV Index reading of 2, and below, represents a low threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in October in Helena?

In October, in Helena, Montana, the average high-temperature is 51.3°F (10.7°C), and the average low-temperature is 32.7°F (0.4°C).

What is the average humidity in October in Helena?

In October, the average relative humidity in Helena, Montana, is 64%.

How many days does it rain in October in Helena?

In Helena, Montana, in October, during 10 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

How many days does it snow in October in Helena?

In Helena, Montana, in October, snow falls for 4.6 days, with typically accumulated 2.72" (69mm) of snow.

How many hours of daylight does Helena have in October?

The average length of the day in October in Helena, Montana, is 10.9h.

How many hours of sunshine does Helena have in October?

In October, the average sunshine in Helena is 7h.

What is the UV index intensity in October in Helena?

In October, the average daily maximum UV index in Helena, Montana, is 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in October - Helena, MT
  • Average high temperature in October: 51.3°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).

  • Average low temperature in October: 32.7°F

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).

Average pressure in October - Helena, MT
  • Average pressure in October: 30.04"

The month with the highest atmospheric pressure is January (30.18").
The month with the lowest atmospheric pressure is June (29.9").

Average wind speed in October - Helena, MT
  • Average wind speed in October: 6.7mph

The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in October - Helena, MT
  • Average humidity in October: 64%

The month with the highest relative humidity is January (85%).
Months with the lowest relative humidity are July and August (46%).

Average rainfall in October - Helena, MT
  • Average rainfall in October: 0.83"

The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").

Average rainfall days in October - Helena, MT
  • Average rainfall days in October: 10 days

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).

Average snowfall in October - Helena, MT
  • Average snowfall in October: 2.72"

The month with the highest snowfall is February (6.18").
Months with the least snowfall are June, July and August (0").

Average snowfall days in October - Helena, MT
  • Average snowfall days in October: 4.6 days

The month with the highest number of snowfall days is February (16.2 days).
Months with the least snowfall days are July and August (0 days).

Average daylight in October / Average sunshine in October - Helena, MT
  • Average daylight in October: 10.9h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in October: 7h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 5.6h).

Average sunshine days in October - Helena, MT
  • Average sunshine days in October: 17.2 days

The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in October - Helena, MT
  • Average cloud cover in October: 29

The month with the most cloud cover is February (Cloud cover 47).
Months with the least cloud cover are July and August (Cloud cover 15).

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

Months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February and December (5mi).