Grand Junction, Colorado Weather
Summer heat breaks with monsoon. Day 43 of summer. Read this microseason across nine climate regions →
Grand Junction weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Partly Cloudy——105°71°—
- MondayAug 3Clear——105°73°0°
- TuesdayAug 4Overcast——103°74°-2°
- WednesdayAug 5Partly Cloudy——101°71°-2°
- ThursdayAug 6Mostly Clear——101°71°0°
- FridayAug 7Clear——105°74°+4°
- SaturdayAug 8Mostly Clear——106°74°+1°
AQI 36 (Good), driven by Ozone. AQI down 7 over the last 6 hours (gradual decline). Ozone at AQI 48 now. With UV 5.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 36.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 48 now. With UV 5.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 36.
- Present
- AQI 48
- UV peak
- 5.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 36
PM × Wind × Precip
PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.68 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.68
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
Red sky at night, sailor's delight.
- Moonrise
- 9:58 PM
- Moonset
- 10:22 AM
- In sign
- ♓︎ Pisces
Summer heat breaks with monsoon
Grand Junction at a glance
- Today vs. normal: 24°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP codes: 81501, 81503, 81504, 81505, 81506, 81507
16-Day Forecast — Grand Junction
- Sun105°71°1%
- Mon105°73°2%
- Tue103°74°0%
- Wed101°71°0%
- Thu101°71°0%
- Fri105°74°0%
- Sat106°74°3%
- Sun106°77°7%
- Mon104°76°19%
- Tue100°75°27%
- Wed98°70°27%
- Thu98°71°43%
- Fri99°73°45%
- Sat99°74°39%
- Sun101°77°32%
- Mon101°73°29%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Grand Junction
Right now in the garden
Peak growing season
As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Sun & seasons in Grand Junction
Grand Junction sits in Mesa County, where the year’s longest day runs 14h 55m of daylight and its shortest just 9h 25m — a swing of +5h 30m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Denver, the state’s largest city, lies about 202 miles to the ENE. The nearest town Grand Junction tracks is Pagosa Springs, roughly 151 miles to the SE.
Air quality in Grand Junction’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 44). See the full air-quality history for Grand Junction.
ZIP codes in Grand Junction
- 81503
- 81506
- 81507
- 81505
- 81504
- 81501
- 81502