July weather forecast
Boulder, CO

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The old building of the University of Colorado in Boulder, Colorado
The old building of the University of Colorado in Boulder, Colorado

Weather in July

July is the peak of summer in Boulder, offering the highest temperatures of the year. The city's atmosphere becomes infused with summer vibes due to high temperatures, hitting highs around 80.4°F (26.9°C) and lows around 55.2°F (12.9°C). Despite the temperature surge, a noteworthy amount of rain (averaging about 1.89" (48mm)) provides a refreshing break. Though August will carry on the summer warmth, it also introduces slight cooling as the season begins to wind down. Therefore, July, with its high temperatures and frequent rainfall, provides a unique blend of weather conditions.

Temperature

The temperatures in Boulder, Colorado, reach their highest averages in July, with highs of 80.4°F (26.9°C) and lows of 55.2°F (12.9°C).

Humidity

In July, the average relative humidity in Boulder is 48%.

Rainfall

In Boulder, during July, the rain falls for 17.8 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Boulder, during the entire year, the rain falls for 117.3 days and collects up to 14.17" (360mm) of precipitation.

Snowfall

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

Daylight

In July, the average length of the day in Boulder is 14h and 41min.
On the first day of July in Boulder, sunrise is at 5:36 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:15 pm MDT.

Sunshine

June and July, with an average of 11.7h of sunshine, are months with the most sunshine.

UV index

June through August, with an average maximum UV index of 5, are months with the highest UV index in Boulder, Colorado. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 5 in July translates into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
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Frequently asked questions

What part of the year is the hottest in Boulder?

Boulder's warmest month, July, generally records average temperatures ranging from a high of 80.4°F (26.9°C) to a low of 55.2°F (12.9°C).

What is the usual temperature for Boulder in July?

The high-temperature in Boulder, Colorado, during July is 80.4°F (26.9°C) and the low-temperature is 55.2°F (12.9°C).

What is the average humidity in July in Boulder?

In July, the average relative humidity in Boulder is 48%.

How many days does it rain in July in Boulder?

In Boulder, Colorado, in July, during 17.8 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

When it does not snow in Boulder?

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

What is the average length of the day in July in Boulder?

In July, the average day length in Boulder is 14h and 41min.

What time are sunrise and sunset in July in Boulder?

On the first day of July in Boulder, sunrise is at 5:36 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:15 pm MDT.

What are the months with the most sunshine in Boulder?

June and July, with an average of 11.7h of sunshine, are months with the most sunshine.

How many hours of sunshine does Boulder have in July?

In Boulder, Colorado, the average sunshine duration in July is 11.7h.

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

The months with the highest UV index in Boulder are June through August, with an average maximum UV index of 5.

What is the UV index reading in July in Boulder?

The average daily maximum UV index in July in Boulder is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from 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 July
Boulder, CO

Average temperature in July - Boulder, CO
  • Average high temperature in July: 80.4°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is December (35.2°F).

  • Average low temperature in July: 55.2°F

The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is February (18°F).

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Average pressure in July
Boulder, CO

Average pressure in July - Boulder, CO
  • Average pressure in July: 30.01"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.92"Hg).

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Average wind speed in July
Boulder, CO

Average wind speed in July - Boulder, CO
  • Average wind speed in July: 5.7mph

The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest months (with the lowest average wind speed) are May, July, August and September (5.7mph).

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Average humidity in July
Boulder, CO

Average humidity in July - Boulder, CO
  • Average humidity in July: 48%

The month with the highest relative humidity is February (70%).
The months with the lowest relative humidity are June, August and September (45%).

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Average rainfall in July
Boulder, CO

Average rainfall in July - Boulder, CO
  • Average rainfall in July: 1.89"

The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in July
Boulder, CO

Average rainfall days in July - Boulder, CO
  • Average rainfall days in July: 17.8 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (3.3 days).

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Average snowfall in July
Boulder, CO

Average snowfall in July - Boulder, CO
  • Average snowfall in July: 0"

The month with the highest snowfall is April (7.76").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in July
Boulder, CO

Average snowfall days in July - Boulder, CO
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in July /
Average sunshine in July
Boulder, CO

Average daylight in July / Average sunshine in July - Boulder, CO
  • Average daylight in July: 14h 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 July: 11h and 4min

The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

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Average sunshine days in July
Boulder, CO

Average sunshine days in July - Boulder, CO
  • Average sunshine days in July: 9.9 days

The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (9.9 days).

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Average UV index in July
Boulder, CO

Average UV index in July - Boulder, CO
  • Average UV index in July: 5

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in July
Boulder, CO

Average cloud cover in July - Boulder, CO
  • Average cloud cover in July: 20

The months with the most cloud cover are April and May (Cloud cover 28).
The month with the least cloud cover is September (Cloud cover 16).

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Average visibility in July
Boulder, CO

Average visibility in July - Boulder, CO
  • Average visibility in July: 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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Boulder, Colorado, USA

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