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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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Napa's allergy season varies with proximity to the coast. Coastal breezes help, but residents of Napa, CA can still experience significant pollen from February through October, especially during dry, warm spells.
Right now: October ends pollen season in Napa. Fall rains help clear remaining allergens from the air.
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 Napa 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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Google UPI 0/5
Weather
66°F
Sunny · 51% humidity · 2 mph wind
YES
Grass pollen is moderate with calm conditions. Most people can head out comfortably.
Air quality: AQI is 49 (good).
Best hours: 19:00-21:00
Hourly pollen risk is estimated from weather trends when no live hourly pollen feed is available.
Informational only. Not medical advice. For health concerns, please consult a qualified healthcare provider. Editorial standards.