Petaluma, California Weather
Coastal fog thickens at dawn. Day 78 of spring. Read this microseason across nine climate regions →
Petaluma weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——79°48°—
- FridayJun 5Clear——85°53°+6°
- SaturdayJun 6Overcast——77°49°-8°
- SundayJun 7Overcast——76°45°-1°
- MondayJun 8Heavy Drizzle19%0.27″58°48°-18°
- TuesdayJun 9Light Drizzle24%—77°54°+19°
- WednesdayJun 10Clear——86°52°+9°
Ozone at AQI 38 — 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 38 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 38
- UV peak
- 2.5 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 38
PM × Wind × Precip
PM2.5/PM10 ratio 0.68 with 8 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.68
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 7:09 AM
- Moonset
- 5:27 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Petaluma at a glance
- Today vs. normal: 76°F — typical for the season
- 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 5, 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.