August weather forecast and climate
Grand Junction, CO

The scenic Grand Junction in Colorado with the iconic Colorado River and high hills nearby
The scenic Grand Junction in Colorado with the iconic Colorado River and high hills nearby

Weather in August

August, the last month of the summer, in Grand Junction, is also a moderately hot month, with average temperature fluctuating between 58.8°F (14.9°C) and 84.2°F (29°C).

Temperature

In Grand Junction, the average high-temperature is essentially the same as in July - a moderately hot 84.2°F (29°C). The average low-temperature, in Grand Junction, Colorado, is 58.8°F (14.9°C).

Humidity

In Grand Junction, the average relative humidity is 38%.

Rainfall

In Grand Junction, it is raining for 8.7 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 93.6 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Snowfall

In Grand Junction snow does not fall in May through September.

Daylight

In August, the average length of the day is 13.6h.

Sunshine

The average sunshine in Grand Junction is 11.9h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 average humidity in August in Grand Junction?

In August, the average relative humidity in Grand Junction, Colorado, is 38%.

How much does it rain in Grand Junction in August?

In Grand Junction, Colorado, in August, it is raining for 8.7 days, with typically 0.75" (19mm) of accumulated precipitation.

When it does not snow in Grand Junction?

In Grand Junction, Colorado, snow does not fall in May through September.

How many hours of daylight does Grand Junction have in August?

In Grand Junction, the average length of the day in August is 13.6h.

How long on average sun shines in August in Grand Junction?

The average sunshine in August is 11.9h.

What is the month with the highest UV index in Grand Junction?

Months with the highest UV index in Grand Junction, Colorado, are June through August, with an average maximum UV index of 6.

What is the UV index intensity in August in Grand Junction?

In Grand Junction, Colorado, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays.

Average temperature in August
Grand Junction, CO

Average temperature in August - Grand Junction, CO
  • Average high temperature in August: 84.2°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (34.9°F).

  • Average low temperature in August: 58.8°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

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Average pressure in August
Grand Junction, CO

Average pressure in August - Grand Junction, CO
  • Average pressure in August: 30"

The month with the highest atmospheric pressure is January (30.27").
Months with the lowest atmospheric pressure are May and June (29.9").

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Average wind speed in August
Grand Junction, CO

Average wind speed in August - Grand Junction, CO
  • Average wind speed in August: 5.9mph

The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).

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Average humidity in August
Grand Junction, CO

Average humidity in August - Grand Junction, CO
  • Average humidity in August: 38%

The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is June (29%).

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Average rainfall in August
Grand Junction, CO

Average rainfall in August - Grand Junction, CO
  • Average rainfall in August: 0.75"

The wettest month (with the highest rainfall) is March (1.06").
The driest month (with the least rainfall) is June (0.51").

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Average rainfall days in August
Grand Junction, CO

Average rainfall days in August - Grand Junction, CO
  • Average rainfall days in August: 8.7 days

The month with the highest number of rainy days is March (10.4 days).
The month with the least rainy days is November (5.5 days).

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Average snowfall in August
Grand Junction, CO

Average snowfall in August - Grand Junction, CO
  • Average snowfall in August: 0"

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

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Average snowfall days in August
Grand Junction, CO

Average snowfall days in August - Grand Junction, CO
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (7.9 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Grand Junction, CO

Average daylight in August / Average sunshine in August - Grand Junction, CO
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 11.9h

The month with the most sunshine is June (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 6.3h).

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Average sunshine days in August
Grand Junction, CO

Average sunshine days in August - Grand Junction, CO
  • Average sunshine days in August: 16.6 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is February (15.8 days).

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Average UV index in August
Grand Junction, CO

Average UV index in August - Grand Junction, CO
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
Grand Junction, CO

Average cloud cover in August - Grand Junction, CO
  • Average cloud cover in August: 12

The month with the most cloud cover is January (Cloud cover 31).
Months with the least cloud cover are June and September (Cloud cover 11).

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Average visibility in August
Grand Junction, CO

Average visibility in August - Grand Junction, CO
  • Average visibility in August: 6mi

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

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