Greeley, Colorado Weather
Summer heat breaks with monsoon. Day 43 of summer. Read this microseason across nine climate regions →
Greeley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Overcast——103°63°—
- MondayAug 3Overcast12%—102°67°-1°
- TuesdayAug 4Drizzle12%—83°59°-19°
- WednesdayAug 5Drizzle——94°56°+11°
- ThursdayAug 6Heavy Drizzle——96°58°+2°
- FridayAug 7Clear——104°63°+8°
- SaturdayAug 8Overcast——107°64°+3°
AQI 46 (Good), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 8.8 µg/m³ (AQI 49) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
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 31 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 25.
- Present
- AQI 31
- UV peak
- 6.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 8.8 µg/m³ (AQI 49) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.95
- 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
- 9:44 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Summer heat breaks with monsoon
Greeley at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP codes: 80631, 80634
16-Day Forecast — Greeley
- Sun103°63°1%
- Mon102°67°12%
- Tue83°59°12%
- Wed94°56°8%
- Thu96°58°7%
- Fri104°63°2%
- Sat107°64°3%
- Sun103°67°10%
- Mon105°66°19%
- Tue103°65°27%
- Wed96°62°43%
- Thu96°60°43%
- Fri100°62°46%
- Sat94°58°50%
- Sun100°62°52%
- Mon102°60°43%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Greeley
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.
SPC Convective Outlook
Storm Prediction Center — Greeley
SPC includes Greeley in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Sun & seasons in Greeley
Greeley sits in Weld County, where the year’s longest day runs 15h 4m of daylight and its shortest just 9h 17m — a swing of +5h 47m 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 45 miles to the S. The nearest town Greeley tracks is Timnath, roughly 13 miles to the NW.
Air quality in Greeley’s county has held roughly steady since 2020; its cleanest year on record was 2022 (median AQI 51). See the full air-quality history for Greeley.
ZIP codes in Greeley
- 80631
- 80634
- 80632
- 80633
- 80638
- 80639