Thornton, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Thornton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——96°62°—
- MondayJul 6Overcast——99°66°+3°
- TuesdayJul 7Overcast36%—98°76°-1°
- WednesdayJul 8Light Rain61%0.07″96°69°-2°
- ThursdayJul 9Light Rain48%0.05″95°70°-1°
- FridayJul 10Mostly Clear20%—98°72°+3°
- SaturdayJul 11Clear——97°73°-1°
AQI 52 (Moderate), driven by PM2.5. AQI down 39 over the last 6 hours — air quality is improving sharply. PM2.5 at 13.8 µg/m³ (AQI 60) with a 0.94 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 13.8 µg/m³ (AQI 60) with a 0.94 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- Wind
- light
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:18 PM
- Moonset
- 11:14 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Thornton at a glance
- Today vs. normal: 8°F below the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 80241
15-Day Forecast — Thornton
- Sun96°62°2%
- Mon99°66°6%
- Tue98°76°36%
- Wed96°69°61%
- Thu95°70°48%
- Fri98°72°20%
- Sat97°73°4%
- Sun101°76°2%
- Mon108°78°5%
- Tue103°81°13%
- Wed101°79°24%
- Thu103°74°44%
- Fri101°75°45%
- Sat104°75°44%
- Sun96°80°55%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Thornton
Right now in the garden
Peak growing season
As of July 5, 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 — Thornton
SPC includes Thornton in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- 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.
ZIP codes in Thornton
- 80260
- 80233
- 80241
- 80640
- 80023
- 80229
- 80602
- 80614