San Geronimo, California Weather
Summer solstice light stretched thin. Day 88 of spring. Read this microseason across nine climate regions →
San Geronimo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Foggy——71°53°—
- TuesdayJun 16Foggy——64°54°-7°
- WednesdayJun 17Foggy——71°52°+7°
- ThursdayJun 18Overcast——67°52°-4°
- FridayJun 19Overcast——64°54°-3°
- SaturdayJun 20Overcast——65°51°+1°
- SundayJun 21Overcast——70°50°+5°
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.9 µg/m³ (AQI 52), ratio 0.66 with 8 mph wind — characteristic of long-range haze transport rather than a local source.
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 36 now. With UV 6.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 32 around 1 PM.
- Present
- AQI 36
- UV peak
- 6.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 32
PM × Wind × Precip
PM2.5 at 9.9 µg/m³ (AQI 52), ratio 0.66 with 8 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.66
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 5:57 AM
- Moonset
- 8:55 PM
- In sign
- ♋︎ Cancer
Summer solstice light stretched thin
San Geronimo at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: April 4 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — San Geronimo
- Mon71°53°1%
- Tue64°54°0%
- Wed71°52°1%
- Thu67°52°3%
- Fri64°54°3%
- Sat65°51°6%
- Sun70°50°1%
- Mon71°48°1%
- Tue73°48°1%
- Wed79°47°0%
- Thu75°49°0%
- Fri80°46°1%
- Sat95°56°0%
- Sun86°57°0%
- Mon78°55°0%
- Tue77°53°0%
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 San Geronimo
- 94963