Thornton, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Thornton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——94°56°—
- FridayJun 5Clear——97°59°+3°
- SaturdayJun 6Overcast——86°51°-11°
- SundayJun 7Overcast——89°48°+3°
- MondayJun 8Light Drizzle15%0.05″76°52°-13°
- TuesdayJun 9Light Drizzle—0.01″77°55°+1°
- WednesdayJun 10Clear——82°47°+5°
AQI 18 (Good), driven by PM2.5. AQI down 12 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 12 PM.
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
- 6:32 AM
- Moonset
- 4:18 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Thornton at a glance
- Today vs. normal: 18°F below the seasonal normal for this latitude
- Last frost: April 5 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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.