Boulder County (Boulder)
August
Weather in Boulder County, Colorado for August 2026
Your guide to Boulder County weather in August - trends and predictions
So far, August 2026 in Boulder County shows a warmer trend than usual by 2.3 °F.
The forecast for the next days in Boulder County predicts temperatures to be around 31 °F, close to the historical average.
In general, the average temperature in Boulder County at the beginning of August is 32.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.6 °F by the end of August.
The climate of Boulder County in August is notably wet, with an average of 11 rainy days, and a total of 43.1 mm of precipitation.
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Temperatures
Rain 🌧️
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20
Dry days
11
Rainy days
0
Snow days
28°/16°
Temperatures
20 km/h
Avg max wind
43 %
Avg humidity
Boulder County Weather August
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Temperatures trend during August in Boulder County
See the weather trend as well as the moving average line
August weather in Boulder County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Sunny | 32° /14° | 0 mm | 10 | |
| Aug. 2 |  Moderate rain at times | 33° /15° | 0.2 mm | 9 | |
| Aug. 3 | Sunny | 33° /16° | 0 mm | 9 | |
| Aug. 4 |  Cloudy | 30° /16° | 0 mm | 9 | |
| Aug. 5 | Cloudy | 31° /15° | 0.2 mm | 9 | |
| Aug. 6 | Moderate rain at times | 33° /16° | 0.2 mm | 9 | |
| Aug. 7 | Moderate rain at times | 34° /18° | 1.1 mm | 10 | |
| Aug. 8 |  Patchy rain possible | 29° /17° | 0.4 mm | 8 | |
| Aug. 9 | Moderate or heavy rain shower | 27° /16° | 2.5 mm | 8 | |
| Aug. 10 |  Partly cloudy | 27° /14° | 0.8 mm | 7 | |
| Aug. 11 |  Overcast | 28° /15° | 0.2 mm | 8 | |
| Aug. 12 | Sunny | 32° /16° | 14 mm | 7.4 | |
| Aug. 13 | Patchy rain possible | 25° /13° | 5.6 mm | 8.4 | |
| Aug. 14 | Sunny | 29° /13° | 4.8 mm | 8.9 | |
| Aug. 15 | Patchy rain possible | 30° /12° | 1.5 mm | 7.8 | |
| Aug. 16 | Sunny | 30° /13° | 0.4 mm | 9.3 | |
| Aug. 17 | Sunny | 30° /14° | 0.6 mm | 7 | |
| Aug. 18 | Sunny | 32° /15° | 0 mm | 8 | |
| Aug. 19 | Sunny | 32° /16° | 0 mm | 8 | |
| Aug. 20 | Sunny | 28° /10° | 0 mm | 7 | |
| Aug. 21 | Sunny | 32° /12° | 0 mm | 8 | |
| Aug. 22 | Sunny | 35° /15° | 0 mm | 8 | |
| Aug. 23 | Sunny | 34° /17° | 0 mm | 8 | |
| Aug. 24 | Sunny | 33° /17° | 0 mm | 8 | |
| Aug. 25 | Sunny | 33° /16° | 2.2 mm | 8 | |
| Aug. 26 | Partly cloudy | 25° /14° | 1.4 mm | 6 | |
| Aug. 27 | Cloudy | 27° /13° | 0 mm | 6 | |
| Aug. 28 | Partly cloudy | 25° /13° | 1.8 mm | 6 | |
| Aug. 29 | Partly cloudy | 25° /14° | 0 mm | 6 | |
| Aug. 30 | Sunny | 25° /12° | 3.7 mm | 6 | |
| Aug. 31 | Sunny | 26° /13° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Boulder County in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Boulder County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Boulder County in August - FAQ
What are the expected maximum and minimum temperatures in Boulder County during August?
During August, expect a variety of temperatures with highs around 28° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Boulder County during August?
In August, Boulder County can expect light to moderate rainfall, totaling 43.1 mm across approximately 11 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Boulder County during August?
The average wind speed in Boulder County during August is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Boulder County
Explore the daily rainfall trends and prepare for Boulder Countys August weather 💧
Typically, Boulder County has 11 rainy days in August with a total of 43.1 mm of rainfall.
UV exposure in Boulder County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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