Mill Valley, California Weather
Summer solstice light stretched thin. Day 88 of spring. Read this microseason across nine climate regions →
Mill Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Foggy——74°53°—
- TuesdayJun 16Foggy——70°53°-4°
- WednesdayJun 17Foggy——66°54°-4°
- ThursdayJun 18Overcast——63°55°-3°
- FridayJun 19Overcast——63°56°0°
- SaturdayJun 20Overcast——64°51°+1°
- SundayJun 21Mostly Clear——65°51°+1°
AQI 48 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.2 µg/m³ (AQI 55), ratio 0.67 with 11 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 37 now. With UV 8.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 39 around 1 PM.
- Present
- AQI 37
- UV peak
- 8.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 39
PM × Wind × Precip
PM2.5 at 11.2 µg/m³ (AQI 55), ratio 0.67 with 11 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.67
- Wind
- breezy
- 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
- 8:54 PM
- In sign
- ♋︎ Cancer
Summer solstice light stretched thin
Mill Valley at a glance
- Today vs. normal: 5°F below the seasonal normal for this latitude
- Last frost: April 3 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Mill Valley
- Mon75°53°1%
- Tue70°53°1%
- Wed66°54°6%
- Thu63°55°3%
- Fri63°56°5%
- Sat64°51°5%
- Sun65°51°1%
- Mon64°51°2%
- Tue67°51°1%
- Wed71°51°0%
- Thu77°52°0%
- Fri77°50°1%
- Sat90°56°0%
- Sun74°60°0%
- Mon72°58°0%
- Tue71°56°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 Mill Valley
- 94941
- 94942