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Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
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Air Quality
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Weather
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San Mateo's allergy season varies with proximity to the coast. Coastal breezes help, but residents of San Mateo, CA can still experience significant pollen from February through October, especially during dry, warm spells.
Right now: May transitions to grass pollen in San Mateo. Inland areas see higher counts than coastal neighborhoods.
Spring
Feb – May
Tree pollen starts early — alder, birch, and oak are primary triggers.
Summer
May – Jul
Grass pollen peaks. Inland valleys see significantly higher counts than the coast.
Fall
Aug – Oct
Ragweed and sagebrush in drier areas. Coastal cities see lower counts.
Ocean breezes near San Mateo can help clear pollen, but inland valleys trap allergens. Wildfire season also degrades air quality significantly. PollenTracker monitors both pollen and AQI to give you the full picture.
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YES
Tree pollen is moderate with calm conditions. Most people can head out comfortably.
Air quality: AQI is 26 (good).
Best hours: 11:00-13:00
Weather
54°F
Sunny · 94% humidity · 4 mph wind
~5 grains/m³