August weather forecast
Longmont, CO

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Weather in August

August presents another month of the summer season in Longmont with the temperature slightly decreasing compared to July, yet still maintaining a strong hold on the warmth. Rainfall slightly decreases to 0.98" (25mm) over 13.3 days, indicating a transition towards the impending autumn season. Resident swimmers relish the sun-drenched weather for pool dips and jaunts to nearby waters. With events held under sunny skies, August serves as a reminder of the dwindling summer months whilst preparing for the forthcoming autumn.

Temperature

Longmont marks the start of August with an average high-temperature of a still warm 84.7°F (29.3°C), hinting at a slight fluctuation from July's 85.6°F (29.8°C). A marked drop from daytime peak temperatures to an average low-temperature of 57.4°F (14.1°C) is observed during the nights in August.

Heat index

The heat index in August is evaluated at 84.2°F (29°C). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.

Humidity

The least humid month in Longmont is August, with an average relative humidity of 42%.

Rainfall

In Longmont, during August, the rain falls for 13.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, in Longmont, Colorado, there are 105.4 rainfall days, and 10.43" (265mm) of precipitation is accumulated.

Snowfall

In Longmont, snow does not fall in June through September.

Daylight

The average length of the day in August in Longmont is 13h and 43min.
On the first day of August in Longmont, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 7:33 pm MDT.

Sunshine

The average sunshine in August is 11.7h.

UV index

The months with the highest UV index are July and August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 6 during August morphs into the following directions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
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Frequently asked questions

How hot is August in Longmont?

An average high-temperature, in August, in Longmont, is 84.7°F (29.3°C) and the average low-temperature is 57.4°F (14.1°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 84.2°F (29°C).

What is the least humid month in Longmont?

August is the least humid month in Longmont, with an average relative humidity of 42%.

What is the average humidity in August in Longmont?

In Longmont, the average relative humidity in August is 42%.

How many days does it rain in August in Longmont?

In Longmont, Colorado, during August, the rain falls for 13.3 days and regularly aggregates up to 0.98" (25mm) of precipitation.

When it does not snow in Longmont?

June through September are months without snowfall in Longmont.

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

In August, the average day length in Longmont, Colorado, is 13h and 43min.

When is the sunrise / sunset in August in Longmont?

On the first day of August in Longmont, Colorado, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 7:33 pm MDT.

How long on average sun shines in August in Longmont?

The average sunshine duration in August is 11.7h.

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

July and August, with an average maximum UV index of 6, are months with the highest UV index in Longmont.

How high is the UV index in August in Longmont?

The average daily maximum UV index in August in Longmont, Colorado, is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Longmont, CO

Average temperature in August - Longmont, CO
  • Average high temperature in August: 84.7°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (39°F).

  • Average low temperature in August: 57.4°F

The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is December (19.9°F).

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Average pressure in August
Longmont, CO

Average pressure in August - Longmont, CO
  • Average pressure in August: 30"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).

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Average wind speed in August
Longmont, CO

Average wind speed in August - Longmont, CO
  • Average wind speed in August: 5.6mph

The windiest months (with the highest average wind speed) are March and April (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.6mph).

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Average humidity in August
Longmont, CO

Average humidity in August - Longmont, CO
  • Average humidity in August: 42%

The month with the highest relative humidity is February (66%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in August
Longmont, CO

Average rainfall in August - Longmont, CO
  • Average rainfall in August: 0.98"

The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is January (0.35").

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Average rainfall days in August
Longmont, CO

Average rainfall days in August - Longmont, CO
  • Average rainfall days in August: 13.3 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (3.5 days).

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Average snowfall in August
Longmont, CO

Average snowfall in August - Longmont, CO
  • Average snowfall in August: 0"

The month with the highest snowfall is November (4.41").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Longmont, CO

Average snowfall days in August - Longmont, CO
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (7.7 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
Longmont, CO

Average daylight in August / Average sunshine in August - Longmont, 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 4min

The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).

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Average sunshine days in August
Longmont, CO

Average sunshine days in August - Longmont, CO
  • Average sunshine days in August: 11.6 days

The month with the most sunshine days is January (23.4 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in August
Longmont, CO

Average UV index in August - Longmont, CO
  • Average UV index in August: 6

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

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Average cloud cover in August
Longmont, CO

Average cloud cover in August - Longmont, CO
  • Average cloud cover in August: 17

The months with the most cloud cover are April and May (Cloud cover 26).
The months with the least cloud cover are June and September (Cloud cover 16).

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Average visibility in August
Longmont, CO

Average visibility in August - Longmont, CO
  • 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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Longmont, Colorado, USA

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