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 fluctuating between 50.2°F (10.1°C) and 78.1°F (25.6°C).

Temperature

In Helena, the average high-temperature in August is almost the same as in July - a still warm 78.1°F (25.6°C). In Helena, the average low-temperature is 50.2°F (10.1°C).

Humidity

July and August, with an average relative humidity of 46%, are the least humid months in Helena, Montana.

Rainfall

In Helena, Montana, in August, it is raining for 9.1 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, there are 123.7 rainfall days, and 12.4" (315mm) of precipitation is accumulated.

Snowfall

June through August are months without snowfall in Helena.

Daylight

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

Sunshine

In August, the average sunshine in Helena is 11.5h.

UV index

In August, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In August, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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.

What is the temperature in August in Helena?

The average high-temperature, in August, is 78.1°F (25.6°C), while the average low-temperature is 50.2°F (10.1°C).

What are the least humid months in Helena?

Months with the lowest humidity are July and August, with an average relative humidity of 46%.

What is the average humidity in August in Helena?

In August, the average relative humidity in Helena is 46%.

How many days does it rain in August in Helena?

In Helena, during August, the rain falls for 9.1 days and regularly aggregates up to 0.87" (22mm) of precipitation.

Does it snow in Helena in August?

In Helena, Montana, in August, it doesn't snow. In September, it regularly snows.

When it does not snow in Helena?

In Helena, Montana, snow does not fall in June through August.

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

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

How long on average sun shines in August in Helena?

In Helena, Montana, the average sunshine in August is 11.5h.

How high is the UV index in August in Helena?

In August, the average daily maximum UV index in Helena is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in August - Helena, MT
  • Average high temperature in August: 78.1°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 August: 50.2°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 August - Helena, MT
  • Average pressure in August: 29.95"

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 August - Helena, MT
  • Average wind speed in August: 5mph

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 August - Helena, MT
  • Average humidity in August: 46%

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

Average rainfall in August - Helena, MT
  • Average rainfall in August: 0.87"

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 August - Helena, MT
  • Average rainfall days in August: 9.1 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 August - Helena, MT
  • Average snowfall in August: 0"

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 August - Helena, MT
  • Average snowfall days in August: 0 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 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 the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in August: 11.5h

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 August - Helena, MT
  • Average sunshine days in August: 19.5 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 August - Helena, MT
  • Average UV index in August: 4

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 August - Helena, MT
  • Average cloud cover in August: 15

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 August - Helena, MT
  • Average visibility in August: 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).