Boulder (CO)
August
Weather in Boulder, Colorado for August 2026
Your guide to Boulder weather in August - trends and predictions
In general, the average temperature in Boulder at the beginning of August is 32.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °F by the end of August.
Boulder experiences moderate rainfall in August, with an average of 9 rainy days and a total precipitation of 32.4 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
28°/16°
Temperatures
17 km/h
Avg max wind
41 %
Avg humidity
Boulder Weather August
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Temperatures trend during August in Boulder
See the weather trend as well as the moving average line
August weather in Boulder day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Sunny | 32° /15° | 0 mm | 8 | |
| Aug. 2 |  Moderate rain at times | 31° /15° | 0.3 mm | 7 | |
| Aug. 3 | Sunny | 31° /15° | 0 mm | 8 | |
| Aug. 4 |  Cloudy | 34° /18° | 0 mm | 8 | |
| Aug. 5 |  Patchy rain possible | 32° /19° | 0.3 mm | 7 | |
| Aug. 6 | Moderate rain at times | 32° /18° | 0.3 mm | 7 | |
| Aug. 7 | Moderate rain at times | 34° /21° | 1.6 mm | 8 | |
| Aug. 8 | Patchy rain possible | 25° /18° | 0.6 mm | 6 | |
| Aug. 9 | Moderate or heavy rain shower | 23° /15° | 3.2 mm | 5 | |
| Aug. 10 |  Partly cloudy | 24° /14° | 0.2 mm | 6 | |
| Aug. 11 |  Overcast | 26° /15° | 0 mm | 6 | |
| Aug. 12 | Patchy rain possible | 27° /16° | 0.1 mm | 7 | |
| Aug. 13 | Moderate or heavy rain shower | 30° /15° | 1.1 mm | 7 | |
| Aug. 14 | Patchy rain possible | 30° /18° | 0.8 mm | 7 | |
| Aug. 15 | Partly cloudy | 29° /15° | 0.2 mm | 7 | |
| Aug. 16 | Sunny | 30° /17° | 0.1 mm | 7 | |
| Aug. 17 | Overcast | 32° /17° | 0 mm | 8 | |
| Aug. 18 | Overcast | 32° /17° | 0.1 mm | 8 | |
| Aug. 19 |  Heavy rain at times | 30° /17° | 0.6 mm | 7 | |
| Aug. 20 | Partly cloudy | 31° /16° | 0 mm | 8 | |
| Aug. 21 | Moderate or heavy rain shower | 31° /19° | 2.7 mm | 7 | |
| Aug. 22 | Patchy rain possible | 28° /17° | 6.2 mm | 7 | |
| Aug. 23 | Moderate rain at times | 24° /14° | 3.8 mm | 6 | |
| Aug. 24 | Overcast | 24° /15° | 4.8 mm | 6 | |
| Aug. 25 | Moderate or heavy rain shower | 24° /15° | 9.4 mm | 5 | |
| 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 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 forecast closer to your planned date for the most up-to-date weather information.
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Boulder in August - FAQ
What are the expected maximum and minimum temperatures in Boulder 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 during August?
In August, Boulder can expect light to moderate rainfall, totaling 32.4 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Boulder during August?
The average wind speed in Boulder during August is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Boulder
Explore the daily rainfall trends and prepare for Boulders August weather 💧
UV exposure in Boulder during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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