August weather forecast and climate
Lewistown, MT

Weather in August

August, the last month of the summer, in Lewistown, is another warm month, with average temperature varying between 78.1°F (25.6°C) and 54.5°F (12.5°C).

Temperature

In Lewistown, the average high-temperature in August is essentially the same as in July - a still warm 78.1°F (25.6°C). In Lewistown, the average low-temperature is 54.5°F (12.5°C).

Humidity

The least humid month is August, with an average relative humidity of 47%.

Rainfall

In Lewistown, it is raining for 10.5 days, with typically 1.34" (34mm) of accumulated precipitation. In Lewistown, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.

Snowfall

July and August are months without snowfall in Lewistown.

Daylight

In Lewistown, the average length of the day in August is 14.2h.

Sunshine

The average sunshine in August is 11.4h.

UV index

In August, the average daily maximum UV index in Lewistown is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 in August interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
[Resources]

FAQ

What is the least humid month in Lewistown?

August is the least humid month in Lewistown, with an average relative humidity of 47%.

What is the average humidity in August in Lewistown?

The average relative humidity in August in Lewistown, Montana, is 47%.

How many days does it rain in August in Lewistown?

In Lewistown, in August, it is raining for 10.5 days, with typically 1.34" (34mm) of accumulated precipitation.

When it does not snow in Lewistown?

In Lewistown, Montana, snow does not fall in July and August.

Does it snow in Lewistown in August?

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

How many hours of daylight does Lewistown have in August?

In Lewistown, the average length of the day in August is 14.2h.

How long on average sun shines in August in Lewistown?

In Lewistown, the average sunshine in August is 11.4h.

How high is the UV index in August in Lewistown?

In August, the average daily maximum UV index in Lewistown is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in August
Lewistown, MT

Average temperature in August - Lewistown, MT
  • Average high temperature in August: 78.1°F

The warmest month (with the highest average high temperature) is July (78.8°F).
Months with the lowest average high temperature are February and December (29.1°F).

  • Average low temperature in August: 54.5°F

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

[Resources]

Average pressure in August
Lewistown, MT

Average pressure in August - Lewistown, MT
  • Average pressure in August: 29.9"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.85").

[Resources]

Average wind speed in August
Lewistown, MT

Average wind speed in August - Lewistown, MT
  • Average wind speed in August: 7.4mph

The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

[Resources]

Average humidity in August
Lewistown, MT

Average humidity in August - Lewistown, MT
  • Average humidity in August: 47%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

[Resources]

Average rainfall in August
Lewistown, MT

Average rainfall in August - Lewistown, MT
  • Average rainfall in August: 1.34"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").

[Resources]

Average rainfall days in August
Lewistown, MT

Average rainfall days in August - Lewistown, MT
  • Average rainfall days in August: 10.5 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

[Resources]

Average snowfall in August
Lewistown, MT

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

The month with the highest snowfall is April (9.13").
Months with the least snowfall are July and August (0").

[Resources]

Average snowfall days in August
Lewistown, MT

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

The month with the highest number of snowfall days is February (15.2 days).
Months with the least snowfall days are July and August (0 days).

[Resources]

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

Average daylight in August / Average sunshine in August - Lewistown, MT
  • Average daylight in August: 14.2h

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: 11.4h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

[Resources]

Average sunshine days in August
Lewistown, MT

Average sunshine days in August - Lewistown, MT
  • Average sunshine days in August: 17.2 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

[Resources]

Average UV index in August
Lewistown, MT

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

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

[Resources]

Average cloud cover in August
Lewistown, MT

Average cloud cover in August - Lewistown, MT
  • Average cloud cover in August: 17

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).

[Resources]

Average visibility in August
Lewistown, MT

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

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location