Weather Forecast for Boulder

Colorado, United States of America

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Clear

Current Weather - Boulder: 20°C

Colorado, United States of America

Clear

Feels like 20°C

Wind

13 km/h W

Humidity

83%

Pressure

1021 mb

UV Index

0

Visibility

16 km

Sunny

Sunny

Friday, July 24, 2026

High

34°C

Low

16°C

Rain Chance

17%

Hourly Forecast

Sunny 30°C
11:00
Sunny 32°C
12:00
Sunny 32°C
13:00
Sunny 33°C
14:00
Sunny 34°C
15:00
Partly Cloudy 34°C
16:00
Sunny 33°C
17:00
Sunny 33°C
18:00
Partly Cloudy 32°C
19:00
Patchy rain nearby 24°C
20:00
Clear 23°C
21:00
Patchy rain nearby 22°C
22:00
Partly Cloudy 22°C
23:00
Jul 25

Day Statistics

Maximum Wind

15 km/h

Humidity

42%

Precipitation

0 mm

UV Index

11

Visibility

10 km

Rain Chance

17%

Snow Chance

0%

Sun & Moon

Sunrise

05:52 AM

Sunset

08:22 PM

Moonrise

05:24 PM

Moonset

01:26 AM

Moon Phase

Waxing Gibbous

Moon Illumination

82%

Air Quality

PM2.5

6.1

μg/m³

PM10

6.6

μg/m³

NO₂

7.8

μg/m³

O₃

81.8

μg/m³

SO₂

0.4

μg/m³

CO

128.5

μg/m³

US EPA Index: 1 GB DEFRA Index: 1

Weather Alerts

Air Quality Alert issued July 23 at 4:10PM MDT by NWS Denver CO

Arapahoe, CO; Jefferson, CO; Denver, CO; Broomfield, CO; Adams, CO; Weld, CO; Boulder, CO; Larimer, CO; Douglas, CO Jul 23, 04:10 PM - Jul 24, 04:00 PM
Severity: Unknown Urgency: Unknown

The Colorado Department of Public Health and Environment has issued the following... WHAT...Ozone Action Day Alert. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Thursday July 23 to 400 PM Friday July 24 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Ozone will remain in the Good to Moderate range on Thursday. On Friday, hot and sunny weather will allow Ozone to reach the Unhealthy for Sensitive Groups category. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce ozone pollution by limiting driving gas and diesel-powered vehicles until at least 4 p.m. Friday, July 24, 2026. Colorado is also addressing ozone pollution through state policies. For more information about health impacts and how ozone pollution forms in Colorado, visit: https://cdphe.colorado.gov/ozone- pollution-and-your-health HEALTH INFORMATION...Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.

Event: Air Quality Alert Certainty: Unknown Category: Met