Very Low Pollen in San Mateo, CA
Very low today, mostly grass pollen.
Last updated July 1, 2026
Today's indexVery Low
GrassVery Lowoff-season
What to do today
- Pollen levels are very low right now. It's a great day to enjoy the outdoors!
Forecast
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About pollen in San Mateo
Pollen activity around San Mateo is light today, with the overall index sitting at Very Low. Grass is the only category with available data, also registering Very Low, while tree and weed pollen are unreported. The five-day outlook holds steady, keeping grass at Very Low through the period with no expected jump. This tracks with late June, when grass pollen typically lingers as the dominant source after the spring tree season has wound down. Regional trees such as oak, cypress, and juniper are generally past their springtime peak by now, and ragweed activity usually does not arrive until later in the summer.
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.