United StatesAverage weather for Boulder in August
It's hot in August in Boulder with an average temperature of 30°C. Temperatures this month range from a low of 28°C to a high of 32°C. At night, you can expect temperatures between 14°C and 17°C.
Start of August
The month of August starts in Boulder with hot temps, averaging around 31°C during the day and nights around 17°C. There’s little chance of precipitation. The weather’s mostly sunny and dry.
With the temperature difference between day and night, it’s smart to wear layers.
Mid August
By mid-August, daytime temps stay steady at around 31°C, with nights around 16°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
Since it cools down at night, it’s a good idea to wear layers.
End of August
By the end of August, the average daytime temperature in Boulder is around 31°C, while nighttime temps are about 16°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
Because temperatures drop in the evening, wearing layers is recommended.
In August, there is an average of 19 mm of precipitation, spread over 4 days. The wind speed is around 3 Bft, mostly coming from the South.
Boulder in August |
New York | ||
|---|---|---|---|
 Average temperature |
30°C | 30°C | |
 Max. temperature |
32°C | 31°C | |
| Min. temperature |
28°C | -5°C | |
 Total precipitation |
19 mm | 79 mm | |
| Rainy days |
4 days | 13 days | |
July
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is August a good time to visit Boulder?
August is an awesome month to be in Boulder for sunny weather. You’ll have high temperatures and not much chance of rain this month.
Temperature records
With 37°C in 2015, Boulder reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 17°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 7°C to a highest value of 23°C.
Check out the climate of Boulder for all months and discover the best travel time
Daily Temperature in August in Boulder
This chart shows the average daily high and low temperatures in August for Boulder, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in August in Boulder
The chart below shows the average daily precipitation in August for Boulder, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for August, you can expect about 4 days of precipitation in Boulder.
Daily UV index in August in Boulder
This chart shows the average daily UV index in August in Boulder, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in August in Boulder over the years
This chart shows the average temperature in August in Boulder, measured in degrees Celsius, over the past few years.
Total precipitation in August in Boulder over the years
This chart shows the average precipitation in August in Boulder, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in August for Boulder
Click on any day in August to get detailed info about the usual weather on that day in Boulder. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in Boulder
Have you been to Boulder in August?
Share your weather experience in August in Boulder.
Average weather in Boulder by month
Click on a month below to see detailed weather info for Boulder. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
