August weather forecast
Granby, CO

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Weather in August

August welcomes a slight downtrend from the heat in Granby, but continues to keep the summer spirit thriving. The month bears the second-highest maximum average temperature, standing ar 71.2°F (21.8°C). The cloud cover reduces concurrently with the descending temperatures while the pleasant breeze continues to persist. Consequently, the city experiences its least rainfall during this month, capping the summer with a dry and warm climate. Thus, August harmonizes the vanishing heat with limited rainfall, encouraging a seamless transition towards the coming cooler months.

Temperature

August commences with an average high-temperature of a still pleasant 71.2°F (21.8°C), showing little deviation from July's 72.3°F (22.4°C). Granby registers a prominent dip from daytime highs, with an average of 42.1°F (5.6°C) during the nights of August.

Humidity

The average relative humidity in August in Granby is 52%.

Rainfall

The month with the least rainfall in Granby is August, when the rain falls for 8.8 days and typically collects 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. Throughout the year, there are 110.7 snowfall days, and 59.88" (1521mm) of snow is accumulated.

Daylight

In August, the average length of the day in Granby, Colorado, is 13h and 42min.
On the first day of August in Granby, sunrise is at 6:02 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:36 pm MDT.

Sunshine

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

UV index

The months with the highest UV index in Granby are June through August, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In August, the maximum UV index of 4 transforms into these recommendations:
Guard yourself - Avoiding sunburn is suggested. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What is the usual temperature for Granby in August?

Granby in August has an average high-temperature of 71.2°F (21.8°C) and an average low-temperature of 42.1°F (5.6°C).

What is the average humidity in August in Granby?

The average relative humidity in August is 52%.

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.

How many days does it rain in August in Granby?

In Granby, in August, during 8.8 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

When does it start to snow 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.

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

In Granby, Colorado, the average day length in August is 13h and 42min.

What time are sunrise and sunset in August in Granby?

On the first day of August in Granby, Colorado, sunrise is at 6:02 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:36 pm MDT.

What is the month with the most sunshine in Granby?

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

How long on average sun shines in August in Granby?

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

What are the months with the highest UV index in Granby?

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

How high is the UV index 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 moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 13h and 4min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in August: 11h and 5min

The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).

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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

The 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

The months with the highest UV index are June, July and August (UV index 4).
The 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

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

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Granby, Colorado, USA

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