August weather forecast
Roundup, MT

Weather in August

The last month of the summer, August, is also a moderately hot month in Roundup, Montana, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 82.8°F (28.2°C).

Temperature

In Roundup, the average high-temperature in August is practically the same as in July - a still moderately hot 82.8°F (28.2°C). In August, the average low-temperature is 61.5°F (16.4°C).

Humidity

The least humid month is August, with an average relative humidity of 39%.

Rainfall

In August, in Roundup, the rain falls for 10.6 days. Throughout August, 0.98" (25mm) of precipitation is accumulated. In Roundup, during the entire year, the rain falls for 114.3 days and collects up to 12.13" (308mm) of precipitation.

Snowfall

June through August are months without snowfall.

Daylight

In Roundup, the average length of the day in August is 14h and 7min.
On the first day of the month, sunrise is at 5:55 am and sunset at 8:45 pm. On the last day of August, sunrise is at 6:33 am and sunset at 7:55 pm MDT.

Sunshine

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

UV index

In August, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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.
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FAQ

What is the least humid month in Roundup?

August is the least humid month in Roundup, with an average relative humidity of 39%.

What is the average humidity in August in Roundup?

The average relative humidity in August in Roundup is 39%.

How much does it rain in Roundup in August?

In August, the rain falls for 10.6 days. Throughout August, 0.98" (25mm) of precipitation is accumulated.

When it does not snow in Roundup?

In Roundup, snow does not fall in June through August.

Does it snow in Roundup in August?

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

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

In Roundup, Montana, the average day length in August is 14h and 7min.

When is the sunrise / sunset in August in Roundup?

On the first day of August in Roundup, sunrise is at 5:55 am and sunset at 8:45 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 7:55 pm MDT.

How many hours of sunshine does Roundup have in August?

The average sunshine duration in August in Roundup is 11.5h.

What is the UV index intensity in August in Roundup?

In August, the average daily maximum UV index in Roundup, Montana, is 6. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Roundup, MT

Average temperature in August - Roundup, MT
  • Average high temperature in August: 82.8°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in August: 61.5°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).

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Average pressure in August
Roundup, MT

Average pressure in August - Roundup, MT
  • Average pressure in August: 29.89"Hg

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

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Average wind speed in August
Roundup, MT

Average wind speed in August - Roundup, MT
  • Average wind speed in August: 8.5mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).

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Average humidity in August
Roundup, MT

Average humidity in August - Roundup, MT
  • Average humidity in August: 39%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in August
Roundup, MT

Average rainfall in August - Roundup, MT
  • Average rainfall in August: 0.98"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in August
Roundup, MT

Average rainfall days in August - Roundup, MT
  • Average rainfall days in August: 10.6 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).

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Average snowfall in August
Roundup, MT

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

The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in August
Roundup, MT

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

The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in August / Average sunshine in August - Roundup, MT
  • Average daylight in August: 14h and 7min

The month with the longest days is June (Average daylight: 15h and 45min).
The month with the shortest days is December (Average daylight: 8h and 40min).

  • Average sunshine in August: 11h and 30min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 12min).

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Average sunshine days in August
Roundup, MT

Average sunshine days in August - Roundup, MT
  • Average sunshine days in August: 15.8 days

The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).

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Average UV index in August
Roundup, MT

Average UV index in August - Roundup, MT
  • Average UV index in August: 6

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in August
Roundup, MT

Average cloud cover in August - Roundup, MT
  • Average cloud cover in August: 16

The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in August
Roundup, MT

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

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

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