August weather forecast and climate
Westby, MT

Weather in August

The last month of the summer, August, is also a moderately hot month in Westby, Montana, with average temperature fluctuating between 60.6°F (15.9°C) and 81.3°F (27.4°C).

Temperature

In Westby, the average high-temperature in August is practically the same as in July - a still warm 81.3°F (27.4°C). In August, in Westby, the average low-temperature is 60.6°F (15.9°C).

Heat index

In August, the average heat index is appraised at 81.5°F (27.5°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, metabolic differences, differences in body mass, height, and shape, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

With an average relative humidity of 46%, August is the least humid month.

Rainfall

In Westby, Montana, during August, the rain falls for 9 days and regularly aggregates up to 0.87" (22mm) of precipitation. In Westby, during the entire year, the rain falls for 93.3 days and collects up to 12.01" (305mm) of precipitation.

Snowfall

June through September are months without snowfall in Westby.

Daylight

In August, the average length of the day is 14.3h.

Sunshine

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

UV index

In August, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the temperature in August in Westby?

In Westby, in August, the average high-temperature is 81.3°F (27.4°C), and the average low-temperature is 60.6°F (15.9°C). The average heat index (a.k.a. 'real feel', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in August is estimated at 81.5°F (27.5°C).

What is the least humid month in Westby?

The least humid month is August, with an average relative humidity of 46%.

What is the average humidity in August in Westby?

In August, the average relative humidity is 46%.

How many days does it rain in August in Westby?

In Westby, Montana, during August, the rain falls for 9 days and regularly aggregates up to 0.87" (22mm) of precipitation.

When it does not snow in Westby?

In Westby, Montana, snow does not fall in June through September.

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

In Westby, the average length of the day in August is 14.3h.

How many hours of sunshine does Westby have in August?

The average sunshine in August is 11.5h.

What is the UV index intensity in August in Westby?

In August, the average daily maximum UV index in Westby, Montana, is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in August
Westby, MT

Average temperature in August - Westby, MT
  • Average high temperature in August: 81.3°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is February (19.8°F).

  • Average low temperature in August: 60.6°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (6.3°F).

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Average pressure in August
Westby, MT

Average pressure in August - Westby, MT
  • Average pressure in August: 29.89"

The month with the highest atmospheric pressure is February (30.17").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed in August
Westby, MT

Average wind speed in August - Westby, MT
  • Average wind speed in August: 9.3mph

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).

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Average humidity in August
Westby, MT

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

Months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in August
Westby, MT

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

The wettest month (with the highest rainfall) is June (2.17").
The driest month (with the least rainfall) is February (0.47").

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Average rainfall days in August
Westby, MT

Average rainfall days in August - Westby, MT
  • Average rainfall days in August: 9 days

The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.6 days).

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Average snowfall in August
Westby, MT

Average snowfall in August - Westby, MT
  • Average snowfall in August: 0"

The month with the highest snowfall is November (3.74").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Westby, MT

Average snowfall days in August - Westby, MT
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (13.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Westby, MT

Average daylight in August / Average sunshine in August - Westby, MT
  • Average daylight in August: 14.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • 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 February (Average sunshine: 3.9h).

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Average sunshine days in August
Westby, MT

Average sunshine days in August - Westby, MT
  • Average sunshine days in August: 20.1 days

The month with the most sunshine days is August (20.1 days).
Months with the least sunshine days are February and June (13.8 days).

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Average UV index in August
Westby, MT

Average UV index in August - Westby, MT
  • Average UV index in August: 5

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

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Average cloud cover in August
Westby, MT

Average cloud cover in August - Westby, MT
  • Average cloud cover in August: 19

The month with the most cloud cover is February (Cloud cover 60).
Months with the least cloud cover are July and August (Cloud cover 19).

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Average visibility in August
Westby, MT

Average visibility in August - Westby, MT
  • Average visibility in August: 6mi

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

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