This Marin County blog post breaks down the latest AQI⁺ forecast and current PM2.5 measurements. It details what residents from San Rafael to Sausalito, Mill Valley to Fairfax can expect over the next three days.
With moderate winds and a cool marine-influenced pattern, air quality stays stable and within WHO guidelines today.
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Three-day air quality and weather outlook for Marin County
Across Marin, the forecast points to two things: comfortable daytime temperatures and winds that disperse any local pollutants. Current PM2.5 readings fall within the World Health Organization’s annual guideline, which is good news for outdoor plans in towns from Novato to Tiburon.
Expect that classic North Bay pattern—a touch of humidity at first, then drier air as the week goes on. For folks in San Rafael, Larkspur, and Corte Madera, this means reachable days for biking along the Richardson Bay shoreline or strolling the sidewalks of San Anselmo, Fairfax, and Ross.
Moderate winds will keep moving through the Marin hills, helping to dilute any smoke or dust before it drifts into neighborhoods near Mill Valley and Sausalito.
Today in Marin County: cool, breezy, and crisp
Today’s forecast calls for a high of 14°C, a low of 9°C, winds around 19 km/h, and humidity near 89%. You’ll probably notice a cool morning, especially along the waterfront in Sausalito and Tiburon.
By late afternoon, the sun should break through, making it a good window for outdoor jogs in San Rafael and San Anselmo. The air quality stays acceptable, which is a relief for outdoor photographers and hikers heading toward Point Reyes Station or the Marin Headlands.
Tuesday: similar pattern with a touch lighter wind
On Tuesday, temperatures look about the same, with a high near 14°C and a low near 9°C. Winds drop a bit to around 15 km/h, and humidity hovers at about 85%.
If you’re in San Rafael, Santa Venetia, or San Geronimo, expect another day of comfortable walking weather. Air quality should stay in the safe range for outdoor activities at parks from Olompali to China Camp.
Tuesday’s lighter wind could make a morning bike ride along Mill Valley’s ouvrages a bit more relaxed. Sausalito’s waterfront paths will likely stay pleasant in the later hours.
Skies should stay mostly clear. PM2.5 readings continue to reassure residents from Corte Madera to Fairfax that the air stays healthy for kids’ activities and weekend farmers markets in Larkspur and Ross.
Wednesday: a slight warm-up as humidity drops
Wednesday’s looking a bit warmer, with highs close to 17°C and lows down near 6°C. Winds keep easing back, now around 14 km/h, and humidity drops to about 70%.
This drier air changes how particles behave, but current numbers still match WHO’s safe outdoor guidelines. Folks in San Anselmo, Fairfax, and San Rafael will probably notice crisper mornings and sunnier afternoons.
Honestly, it’s a great setup for midweek plans—maybe a hike in Marin County Open Space or a walk along the Tioga Beach corridor by Point Reyes. Out near Marin City and the hills around Ross and Tiburon, the warmer air should feel nice for waterfront jogs or family bike rides along the Pacific.
PM2.5 levels are still healthy, so if you’re thinking about a trip to Golden Gate National Seashore, you can head out without much worry this week.
- Key takeaway: PM2.5 concentrations stick to the WHO annual guideline, so there’s little short-term health risk for most people.
- Air movement matters: Those steady winds keep moving pollutants along, which helps keep Marin’s air generally healthy.
- Humidity matters: As humidity drops and temps climb on Wednesday, particulates might shift a bit, especially near the coast and in the valleys.
- Outdoor planning: With this mild, changeable weather, outdoor activities—anything from a Mount Tamalpais hike to wandering the Sausalito houseboats—are usually safe during the day.
For anyone in Marin County, the pattern’s pretty simple: air quality looks good, and the days start cool but warm up by afternoon in places like San Rafael, Mill Valley, and Novato. It’s smart to check your local AQI⁺ forecast before spending hours outside, but most days you can enjoy that classic North Bay mix of fresh coastal air and hillside views.
Tip for outdoor enthusiasts in Marin: Bring a light jacket if you’re out in Larkspur or Corte Madera in the morning. Longer walks around sunset feel good too, since temps drop and the air stays comfy. For the latest, check AQI⁺ updates and local park advisories as you wander Fairfax or the nearby trails.
Here is the source article for this story: Marin County Air Quality Index (AQI) and USA Air Pollution
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