Boulder Weather in August

August is one of the excellent 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 excellent 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.