Weather in Boulder Today
Current temperature in Boulder: 19°C (66°F). Overcast. Today's high 31°C (88°F), low 16°C (61°F).
Today's Daylight Forecast
Moon & Islamic Calendar
High UV apply sunscreen before heading out. A hat or sun umbrella is recommended during peak hours.
5-Day Weather Forecast
Full 15-Day ForecastAtmospheric Details
Today vs Normal
The long-term average high for today is 27°C.
24 of the last 28 days with published data ran above normal.
It continues that pattern - today's forecast is also running above normal.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.
Health & Activity Advice
UV index is 7 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).
Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.
Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.
Nearby Regional Outlook
Boulder Weather Radar
Live precipitation · Cloud cover · Wind
Frequently Asked Questions
What is the hottest month in Boulder?
The hottest month in Boulder is typically July, with daytime highs averaging around 29.9°C (86°F), based on 10 years of historical weather data. Overnight lows during this period average near 15.1°C (59°F).
What is the coldest month in Boulder?
The coldest month in Boulder is typically February, with overnight lows averaging around -9.2°C (15°F) and daytime highs near 3.9°C (39°F), based on 10 years of historical weather data. Freezing overnight temperatures are common during this month, so plan for icy conditions in the early morning.
Does Boulder have a rainy season?
Boulder doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. May is the wettest month on average (about 102 mm), while December is the driest (about 22 mm).
What's the best time of year to visit Boulder?
The best time to visit Boulder is typically September, when daytime highs average a comfortable 25.5°C (78°F). Rainfall during this window averages around 28 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.
Is Boulder's air quality safe right now?
As of the latest reading, Boulder's air quality index (AQI) is 12, rated "Good", based on the nearest monitoring station. Air quality is considered satisfactory, with little to no health risk.