Today | Weather | Monday, July 20, 2026
Active Weather Warnings

Weather in Grand Junction, Colorado

03:21 PM
Now
Cloudy Weather
102° F
Feels Like 106°
Precipitation 19 %
Wind 7 mph
UV Index (0 - 11+) 8
Humidity 18 %
Today
Sunny with a Chance of Thunderstorms
Day 106°
Night 72°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Grand Junction Weather Forecast Updated

21 minutes ago
Last updated on

Air Quality in Grand Junction

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.26 µg/m³
PM10 3.5 µg/m³
O3 0.043 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.07 ppm
NH3 2.04 µg/m³
NO 0.06 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.52.26 µg/m³
PM103.5 µg/m³
O384.75 µg/m³
NO20.39 µg/m³
SO20.2 µg/m³
CO78.84 µg/m³
NH32.04 µg/m³
NO0.06 µg/m³

Weather Alerts and Warnings for Grand Junction

Unknown Future Possible

Hydrologic Outlook

Hydrologic Outlook issued July 20 at 10:32AM MDT by NWS Grand Junction CO
Jul 20, 10:32 AM Jul 21, 12:00 AM
ESFGJT

Anomalous moisture has become established across portions of
eastern Utah and western Colorado. Scattered thunderstorms capable
of producing heavy rain are expected this afternoon and early
evening. Rainfall rates of 1-2 inches per hour will be possible with
the stronger storms. These rates could lead to flash flooding and
debris flows especially over steep terrain and recent burn scars.
Also, rain over the past several days has lead to saturated soils,
which increase the chances for excessive runoff.

As a reminder: Keep an eye on our forecasts through the end of
the week and stay tuned for updated hydrology alerts if
visiting or if you reside below vulnerable terrain to flash
flooding and/or debris flows. Storms across the west develop
quickly, leaving little room for lead time in flashy terrain.
Updated: Jul 20, 3:00 PM Source: NWS Alert