Helena
Montana, USA
Long-term weather forecast
Long-term weather forecast

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, in Helena, Montana, is a moderate autumn month, with average temperature fluctuating between 32.5°F (0.3°C) and 58.6°F (14.8°C).

Temperature

In October, the average high-temperature decreases, from a pleasant 72.7°F (22.6°C) in September, to a mild 58.6°F (14.8°C). The average low-temperature, in Helena, Montana, is 32.5°F (0.3°C).

Humidity

The average relative humidity in Helena is 58.3%.

Rainfall

In Helena, in October, it is raining for 6.2 days, with typically 0.7" (17.3mm) of accumulated precipitation. In Helena, during the entire year, the rain falls for 91.6 days and collects up to 11.2" (284.9mm) of precipitation.

Snowfall

Months with snowfall are January through May, August through December. In Helena, in October, snow falls for 1.8 days, with typically accumulated 2.4" (61mm) of snow. In Helena, during the entire year, snow falls for 32.8 days, and aggregates up to 38.1" (967.8mm) of snow.

Daylight

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

Sunshine

In Helena, the average sunshine is 6.5h.

UV index

In October, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: In October, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. 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 Helena, in October, the average high-temperature is 58.6°F (14.8°C), and the average low-temperature is 32.5°F (0.3°C).

What is the average humidity in October in Helena?

In October, the average relative humidity in Helena is 58.3%.

How much does it rain in Helena in October?

In October, the rain falls for 6.2 days. Throughout October, 0.7" (17.3mm) of precipitation is accumulated.

How many days does it snow in October in Helena?

In Helena, during October, snow falls for 1.8 days and regularly aggregates up to 2.4" (61mm) of snow.

What is the average length of the day in October in Helena?

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

How many hours of sunshine does Helena have in October?

In Helena, the average sunshine in October is 6.5h.

What is the UV index intensity in October in Helena?

The average daily maximum UV index in October in Helena is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in October - Helena, MT
  • Average high temperature in October: 14.8°C

The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is December (-0.2°C).

  • Average low temperature in October: 0.3°C

The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is December (-11.2°C).

Average humidity in October - Helena, MT
  • Average humidity in October: 58.3%

The month with the highest relative humidity is December (68.1%).
The month with the lowest relative humidity is July (46.4%).

Average rainfall in October - Helena, MT
  • Average rainfall in October: 17.3mm

The wettest month (with the highest rainfall) is June (52.3mm).
The driest month (with the lowest rainfall) is February (7.6mm).

Average rainfall days in October - Helena, MT
  • Average rainfall days in October: 6.2 days

The month with the highest number of rainy days is June (11.2 days).
The month with the lowest number of rainy days is February (5.9 days).

Average snowfall in October - Helena, MT
  • Average snowfall in October: 61mm

The month with the highest snowfall is December (185.4mm).
Months with the lowest snowfall are June and July (0mm).

Average snowfall days in October - Helena, MT
  • Average snowfall days in October: 1.8 days

The month with the highest number of snowfall days is December (6 days).
The month with the lowest number of snowfall days is July (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 shortest days is December (Average daylight: 8.6h).

  • Average sunshine in October: 6.5h

The month with most sunshine is July (Average sunshine: 11.9h).
The month with least sunshine is December (Average sunshine: 3.2h).

Average UV index in October - Helena, MT
  • Average UV index in October: 3

The month with the highest UV index is July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 1).