Greenhorn, California Weather
Summer solstice light stretched thin. Day 88 of spring. Read this microseason across nine climate regions →
Greenhorn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Clear——90°63°—
- TuesdayJun 16Overcast——91°67°+1°
- WednesdayJun 17Overcast——93°61°+2°
- ThursdayJun 18Overcast——97°60°+4°
- FridayJun 19Drizzle12%—84°54°-13°
- SaturdayJun 20Partly Cloudy——81°49°-3°
- SundayJun 21Overcast——88°51°+7°
AQI 32 (Good), driven by PM2.5. AQI down 12 over the last 6 hours (gradual decline). PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.76 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 during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 32 now. With UV 1.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 32
- UV peak
- 1.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.76 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.76
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:42 AM
- Moonset
- 8:55 PM
- In sign
- ♋︎ Cancer
Summer solstice light stretched thin
Greenhorn at a glance
- Today vs. normal: 5°F below the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Greenhorn
- Mon90°63°0%
- Tue91°67°0%
- Wed93°61°1%
- Thu97°60°4%
- Fri84°54°12%
- Sat81°49°3%
- Sun88°51°1%
- Mon91°55°1%
- Tue89°56°0%
- Wed88°54°0%
- Thu82°53°0%
- Fri86°52°0%
- Sat92°53°0%
- Sun98°58°0%
- Mon101°61°3%
- Tue97°61°6%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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.
ZIP codes in Greenhorn
- 95971