August weather forecast and climate
Granby, CO

Weather in August

The last month of the summer, August, is also an agreeable month in Granby, Colorado, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 71.2°F (21.8°C).

Temperature

In Granby, Colorado, the average high-temperature is relatively the same as in July - a still agreeable 71.2°F (21.8°C). In Granby, in August, the average low-temperature is 42.1°F (5.6°C).

Humidity

In August, the average relative humidity is 52%.

Rainfall

August is the month with the least rainfall. Rain falls for 8.8 days and accumulates 0.55" (14mm) of precipitation.

Snowfall

January through June, August through December are months with snowfall in Granby. August is the first month it typically snows in Granby. Throughout August, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. In Granby, during the entire year, snow falls for 110.7 days, and aggregates up to 59.88" (1521mm) of snow.

Daylight

In Granby, the average length of the day is 13.7h.

Sunshine

Months with the most sunshine are July and August, with an average of 11.8h of sunshine.

UV index

Months with the highest UV index in Granby are June through August, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In August, the average maximum UV index of 4 translate into the following recommendations:
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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in August in Granby?

The average high-temperature, in August, in Granby, is 71.2°F (21.8°C), while the average low-temperature is 42.1°F (5.6°C).

What is the average humidity in August in Granby?

In August, the average relative humidity in Granby, Colorado, is 52%.

How many days does it rain in August in Granby?

In August, in Granby, the rain falls for 8.8 days. Throughout August, 0.55" (14mm) of precipitation is accumulated.

What is the driest month in Granby?

August is the month with the least rainfall in Granby. Rain falls for 8.8 days and accumulates 0.55" (14mm) of precipitation.

When does it start snowing in Granby?

August is the first month it typically snows in Granby, Colorado. Throughout August, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Granby have in August?

In Granby, the average length of the day in August is 13.7h.

What is the month with the most sunshine in Granby?

July and August, with an average of 11.8h of sunshine, are months with the most sunshine.

How many hours of sunshine does Granby have in August?

In Granby, the average sunshine in August is 11.8h.

When is the highest UV index in Granby?

June through August, with an average maximum UV index of 4, are months with the highest UV index.

What is the UV index reading in August in Granby?

In Granby, Colorado, the average daily maximum UV index in August is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in August
Granby, CO

Average temperature in August - Granby, CO
  • Average high temperature in August: 71.2°F

The warmest month (with the highest average high temperature) is July (72.3°F).
The month with the lowest average high temperature is December (24.6°F).

  • Average low temperature in August: 42.1°F

The month with the highest average low temperature is July (43.7°F).
The coldest month (with the lowest average low temperature) is January (4.3°F).

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Average pressure in August
Granby, CO

Average pressure in August - Granby, CO
  • Average pressure in August: 30.03"

The month with the highest atmospheric pressure is January (30.19").
Months with the lowest atmospheric pressure are April, May and June (29.93").

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Average wind speed in August
Granby, CO

Average wind speed in August - Granby, CO
  • Average wind speed in August: 5mph

The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in August
Granby, CO

Average humidity in August - Granby, CO
  • Average humidity in August: 52%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is June (49%).

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Average rainfall in August
Granby, CO

Average rainfall in August - Granby, CO
  • Average rainfall in August: 0.55"

The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.55").

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Average rainfall days in August
Granby, CO

Average rainfall days in August - Granby, CO
  • Average rainfall days in August: 8.8 days

The month with the highest number of rainy days is May (12.8 days).
The month with the least rainy days is October (4.9 days).

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Average snowfall in August
Granby, CO

Average snowfall in August - Granby, CO
  • Average snowfall in August: 0.04"

The month with the highest snowfall is April (10.94").
The month with the least snowfall is July (0").

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Average snowfall days in August
Granby, CO

Average snowfall days in August - Granby, CO
  • Average snowfall days in August: 0.2 days

The month with the highest number of snowfall days is February (16.1 days).
The month with the least snowfall days is July (0 days).

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Average daylight in August /
Average sunshine in August
Granby, CO

Average daylight in August / Average sunshine in August - Granby, CO
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in August: 11.8h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 6.2h).

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Average sunshine days in August
Granby, CO

Average sunshine days in August - Granby, CO
  • Average sunshine days in August: 16.9 days

Months with the most sunshine days are September and November (19.5 days).
The month with the least sunshine days is May (9.5 days).

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Average UV index in August
Granby, CO

Average UV index in August - Granby, CO
  • Average UV index in August: 4

Months with the highest UV index are June, July and August (UV index 4).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in August
Granby, CO

Average cloud cover in August - Granby, CO
  • Average cloud cover in August: 16

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is September (Cloud cover 15).

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Average visibility in August
Granby, CO

Average visibility in August - Granby, CO
  • Average visibility in August: 6mi

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

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