Napa, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Napa weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——82°53°—
- FridayJun 5Overcast——88°54°+6°
- SaturdayJun 6Overcast——79°51°-9°
- SundayJun 7Overcast——76°46°-3°
- MondayJun 8Drizzle17%0.23″58°50°-18°
- TuesdayJun 9Light Drizzle19%0.01″71°52°+13°
- WednesdayJun 10Clear——80°50°+9°
Ozone at AQI 48 — peak already passed at 1 PM under clear skies. AQI up 13 over the last 6 hours (gradual rise). Levels should ease through evening.
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 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 48
- UV peak
- 7.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 48
PM × Wind × Precip
PM2.5 at 5.9 µg/m³, PM10 at 8.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.74
- Wind
- breezy
- 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
- 6:36 AM
- Moonset
- 4:21 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Napa at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 6 (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.