Thornton, Colorado Weather
Paintbrush crowns the ridges. Day 88 of spring. Read this microseason across nine climate regions →
Thornton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——82°51°—
- TuesdayJun 16Overcast——91°52°+9°
- WednesdayJun 17Overcast——98°69°+7°
- ThursdayJun 18Clear——87°60°-11°
- FridayJun 19Overcast——96°61°+9°
- SaturdayJun 20Overcast32%—97°71°+1°
- SundayJun 21Overcast44%—87°67°-10°
AQI 55 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.3 µg/m³, PM10 at 21.2 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 48 now. With UV 8.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 56 around 1 PM.
- Present
- AQI 48
- UV peak
- 8.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 56
PM × Wind × Precip
PM2.5 at 17.3 µg/m³, PM10 at 21.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.82
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:36 AM
- Moonset
- 8:49 PM
- In sign
- ♋︎ Cancer
Paintbrush crowns the ridges
Thornton at a glance
- Today vs. normal: 75°F — typical for the season
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Thornton
- Mon82°51°3%
- Tue91°52°1%
- Wed98°69°0%
- Thu87°60°0%
- Fri96°61°6%
- Sat97°71°32%
- Sun87°67°44%
- Mon83°66°45%
- Tue94°64°30%
- Wed90°62°19%
- Thu96°65°14%
- Fri101°70°38%
- Sat94°62°39%
- Sun79°58°49%
- Mon89°60°48%
- Tue102°66°29%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Thornton
Right now in the garden
Warm-season window is open
As of June 15, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
ZIP codes in Thornton
- 80260
- 80233
- 80241
- 80640
- 80023
- 80229
- 80602
- 80614