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

August 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
August, the last month of the summer, in Helena, is another warm month, with average temperature varying between 84.6°F (29.2°C) and 52.2°F (11.2°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still moderately hot 84.6°F (29.2°C). The average low-temperature, is 52.2°F (11.2°C).

Humidity

The average relative humidity in Helena, Montana, is 47.5%.

Rainfall

In Helena, in August, it is raining for 7.3 days, with typically 1.2" (30.5mm) of accumulated precipitation. In Helena, Montana, during the entire year, the rain falls for 91.6 days and collects up to 11.2" (284.9mm) of precipitation.

Snowfall

January through May, August through December are months with snowfall.

Daylight

In Helena, the average length of the day is 14.1h.

Sunshine

The average sunshine is 10.5h.

UV index

In August, the average daily maximum UV index in Helena, Montana, is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
In August, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in August in Helena?

In August, the average high-temperature is 84.6°F (29.2°C), and the average low-temperature is 52.2°F (11.2°C).

What is the average humidity in August in Helena?

In Helena, the average relative humidity in August is 47.5%.

How many days does it rain in August in Helena?

In Helena, Montana, during August, the rain falls for 7.3 days and regularly aggregates up to 1.2" (30.5mm) of precipitation.

When does it start snowing in Helena?

August is the first month it typically snows in Helena. Throughout August, in the average 0.1 snowfall days, it receives 0.3" (7.6mm) of snow.

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

In August, the average length of the day in Helena, Montana, is 14.1h.

How long on average sun shines in August in Helena?

In Helena, the average sunshine in August is 10.5h.

What is the UV index intensity in August in Helena?

In August, the average daily maximum UV index in Helena is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in August - Helena, MT
  • Average high temperature in August: 84.5°F

The warmest month (with the highest average high temperature) is July (85.7°F).
The month with the lowest average high temperature is December (31.7°F).

  • Average low temperature in August: 52.2°F

The month with the highest average low temperature is July (54.3°F).
The coldest month (with the lowest average low temperature) is December (11.9°F).

Average humidity in August - Helena, MT
  • Average humidity in August: 47.5%

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 August - Helena, MT
  • Average rainfall in August: 1.2"

The wettest month (with the highest rainfall) is June (2.1").
The driest month (with the lowest rainfall) is February (0.3").

Average rainfall days in August - Helena, MT
  • Average rainfall days in August: 7.3 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 August - Helena, MT
  • Average snowfall in August: 0.3"

The month with the highest snowfall is December (7.3").
Months with the lowest snowfall are June and July (0").

Average snowfall days in August - Helena, MT
  • Average snowfall days in August: 0.1 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 August / Average sunshine in August - Helena, MT
  • Average daylight in August: 14.1h

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 August: 10.5h

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 August - Helena, MT
  • Average UV index in August: 8

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).