Boulder Weather in August

August is one of the perfect months to visit Boulder, with daytime temperatures of 30°C (86°F) and lows of 14°C (57°F) at night. Some rainfall is typical for this time of year.

Rainfall in Boulder in August

Typically, you can expect about 10 days of rain this month, with 29 mm (1.1 in) on average. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Boulder in August

Boulder in August has perfect weather. Days reach 30°C (86°F) and nights cool to 14°C (57°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights cool down to 14°C (57°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Boulder in August

Expect a lot of sunshine this month, with about 306 hours of sun. These sunny conditions add to the overall experience.

For Boulder itself, May, June and September generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Boulder's climate page.

Boulder Temperature in August

Min Temperature 14°C (57°F)  

Max Temperature 30°C (86°F)  

Chance of Rain 34%  

Precipitation 29 mm (1.1 in)  

Rainy days 10 days  

Humidity 48% *  

Sunshine 306 hours *  

Percentage Sunshine 72% *  

* Data from: Denver, the United States of America (45 KM, 28 Miles).

What to Wear in Boulder in August

Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Pack a light rain jacket or compact umbrella for occasional showers. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Boulder in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Boulder's climate page.

More climate data for Boulder

Temperature Rainfall Sunshine Humidity

See the full Boulder climate overview or explore weather in the United States of America.