Very Low Pollen in San Mateo, CA
Very low today, mostly grass pollen.
Last updated July 20, 2026
What to do today
- Pollen levels are very low right now. It's a great day to enjoy the outdoors!
Forecast
About pollen in San Mateo
Pollen levels in San Mateo are quite mild today, with grass the only type registering any measurable activity, and even that is at a very low level. Most people, including those with sensitivities, should have little trouble being outdoors right now, as conditions are about as calm as pollen readings get. Looking ahead, grass pollen is expected to hold steady at this low level over the next couple of days, suggesting no significant change in comfort for allergy sufferers in the near term. This tracks with the seasonal pattern for the area — the region's typical spring bloomers, such as oak, birch, and pine, have largely finished their pollen release, while grasses, which usually peak in late spring and early summer, appear to be tapering off as well. With ragweed season still a ways off, this stretch of summer is shaping up to be a relatively easy one for pollen-sensitive residents.
Common questions
- What is the pollen count in San Mateo, CA today?
- San Mateo, CA is at a very low 1 out of 5 on the Universal Pollen Index today, driven mainly by grass pollen. The five-day outlook holds steady around 1 of 5.
- Is grass pollen high in San Mateo, CA right now?
- Grass pollen is very low today at 1 of 5, and it's past its peak season. Most people won't notice it.