June 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 June

Boulder warmly welcomes summer with the arrival of June, presenting an overall break from the dampness of May. The city indulges in warm temperatures, longer sunshine hours and lower chances of rain, making the city's outdoor lifestyle much more enticing. The UV index for this month typically reaches up to 5, advising the use of proper sun protection while carrying out daylight activities. July will bring the year's highest temperatures, maintaining the summer spirit. Thus, June is renowned for its kickstart of the interesting and dynamic summer period.

Temperature

The average high-temperature exhibits a considerable increase in June, surging from an enjoyable 61°F (16.1°C) in May to a warm 76.6°F (24.8°C). Despite the hot June days, Boulder's nights see an average temperature plunge to a cool 50°F (10°C).

Humidity

June, August and September, with an average relative humidity of 45%, are the least humid months.

Rainfall

In Boulder, in June, during 13.4 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, in Boulder, there are 117.3 rainfall days, and 14.17" (360mm) of precipitation is accumulated.

Snowfall

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

Daylight

June has the longest days of the year, with an average of 15h and 0min of daylight.
On the first day of the month, sunrise is at 5:33 am and sunset at 8:24 pm. On the last day of June, sunrise is at 5:35 am and sunset at 8:34 pm MDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 5 in June converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.

Frequently asked questions

What is the usual temperature for Boulder in June?

In June, in Boulder, the average high-temperature is 76.6°F (24.8°C), and the average low-temperature is 50°F (10°C).

What are the least humid months?

The months with the lowest humidity are June, August and September, with an average relative humidity of 45%.

What is the average humidity in June?

In Boulder, the average relative humidity in June is 45%.

How much does it rain in June?

In June, the rain falls for 13.4 days. Throughout June, 1.5" (38mm) of precipitation is accumulated.

When it does not snow?

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

Does it snow in June?

In June, it doesn't snow. May is the latest month when it typically snows.

When are the longest days?

June has the longest days of the year, with an average of 15h and 0min of daylight.

How many hours of daylight does Boulder have in June?

In June, the average day length is 14h and 58min.

When is the sunrise / sunset in June?

In June, on the first day of the month, sunrise is at 5:33 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 8:34 pm MDT.

What is the month with the most sunshine in Boulder?

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

How long on average sun shines in June?

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

When is the highest UV index?

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

What is the UV index intensity in June?

In Boulder, the average daily maximum UV index in June is 5. A UV Index of 3 to 5 symbolizes a moderate 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 June
Boulder, CO

Average temperature in June - Boulder, CO
  • Average high temperature in June: 76.6°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 June: 50°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).

Average pressure in June
Boulder, CO

Average pressure in June - Boulder, CO
  • Average pressure in June: 29.92"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).

Average wind speed in June
Boulder, CO

Average wind speed in June - Boulder, CO
  • Average wind speed in June: 6mph

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).

Average humidity in June
Boulder, CO

Average humidity in June - Boulder, CO
  • Average humidity in June: 45%

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

Average rainfall in June
Boulder, CO

Average rainfall in June - Boulder, CO
  • Average rainfall in June: 1.5"

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

Average rainfall days in June
Boulder, CO

Average rainfall days in June - Boulder, CO
  • Average rainfall days in June: 13.4 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).

Average snowfall in June
Boulder, CO

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

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

Average snowfall days in June
Boulder, CO

Average snowfall days in June - Boulder, CO
  • Average snowfall days in June: 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).

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

Average daylight in June / Average sunshine in June - Boulder, CO
  • Average daylight in June: 15h and 0min

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 June: 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).

Average sunshine days in June
Boulder, CO

Average sunshine days in June - Boulder, CO
  • Average sunshine days in June: 14.3 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).

Average UV index in June
Boulder, CO

Average UV index in June - Boulder, CO
  • Average UV index in June: 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).

Average cloud cover in June
Boulder, CO

Average cloud cover in June - Boulder, CO
  • Average cloud cover in June: 17

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).

Average visibility in June
Boulder, CO

Average visibility in June - Boulder, CO
  • Average visibility in June: 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).

Boulder, Colorado, USA

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