Weather in Boulder in August
Boulder, United States averages a high of 28.1°C (82.6°F) and low of 14°C (57.2°F) in August, with 11 rain days and 12.5 hours of daily sunshine. Travel score: 85.8/100 (Excellent). The best time to visit Boulder is August.
High
28°C83°F
Low
14°C57°F
🌧️
11
rain days
☀️
12.5
hrs/day sunshine
💧
54%
humidity
86— Excellent
August in Boulder is hot and occasionally wet — ideal for sightseeing and outdoor activities.
What are the average temperatures in Boulder?
How much does it rain in Boulder in August?
Boulder receives an average of 56.5mm of rainfall across 11 rainy days in August. The annual total is 586.4mm.
What should I pack for Boulder in August?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 28°C
🧴
Sunscreen SPF 30+
13 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in August?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31