San Luis Obispo, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
San Luis Obispo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Foggy——71°53°—
- FridayJun 5Foggy——73°51°+2°
- SaturdayJun 6Foggy——73°51°0°
- SundayJun 7Overcast——74°50°+1°
- MondayJun 8Overcast——76°51°+2°
- TuesdayJun 9Light Drizzle—0.02″65°52°-11°
- WednesdayJun 10Clear——73°49°+8°
PM2.5/PM10 ratio 0.62 with 14 mph wind — characteristic of long-range haze transport rather than a local source. AQI down 6 over the last 6 hours (steady decline since this morning).
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 35 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 35
- UV peak
- 4.7 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 35
PM × Wind × Precip
PM2.5/PM10 ratio 0.62 with 14 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.62
- 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
- 6:20 AM
- Moonset
- 4:23 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
San Luis Obispo at a glance
- Today vs. normal: 14°F below the seasonal normal for this latitude
- Last frost: March 19 (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.