Weather Forecast for Boulder

Colorado, United States of America

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Partly cloudy

Current Weather - Boulder: 32°C

Colorado, United States of America

Partly cloudy

Feels like 31°C

Wind

13 km/h E

Humidity

32%

Pressure

1023 mb

UV Index

11

Visibility

16 km

Sunny

Sunny

Friday, July 24, 2026

High

34°C

Low

16°C

Rain Chance

3%

Hourly Forecast

Patchy rain nearby 26°C
20:00
Partly Cloudy 23°C
21:00
Partly Cloudy 23°C
22:00
Partly Cloudy 21°C
23:00
Jul 25

Day Statistics

Maximum Wind

18 km/h

Humidity

41%

Precipitation

0 mm

UV Index

11

Visibility

10 km

Rain Chance

3%

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

Solar Radiation Data

Shortwave Radiation

508.96

Diffuse Radiation

58.66

DNI

0

GTI

0

Weather Alerts

Heat Advisory issued July 24 at 2:51AM MDT until July 26 at 9:00PM MDT by NWS Denver CO

Larimer County Below 6000 Feet/Northwest Weld County; Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County; North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County; Central and South Weld County Jul 24, 02:51 AM - Jul 24, 09:00 PM
Severity: Moderate Urgency: Expected

* WHAT...Temperatures from 99 to 103. * WHERE...Fort Collins, Boulder and the western suburbs of Denver, Denver, and Greeley. * WHEN...From 11 AM to 9 PM MDT both Saturday and Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

Event: Heat Advisory Certainty: Likely Category: Met

Heat Advisory issued July 24 at 2:51AM MDT until July 25 at 9:00PM MDT by NWS Denver CO

Larimer County Below 6000 Feet/Northwest Weld County; Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County; North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County; Central and South Weld County Jul 24, 02:51 AM - Jul 24, 09:00 PM
Severity: Moderate Urgency: Expected

* WHAT...Temperatures from 99 to 103. * WHERE...Fort Collins, Boulder and the western suburbs of Denver, Denver, and Greeley. * WHEN...From 11 AM to 9 PM MDT both Saturday and Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

Event: Heat Advisory Certainty: Likely Category: Met