Very Low Pollen in San Mateo, CA
Very low today, mostly weed pollen.
Last updated August 14, 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 low today, with weeds the only category showing any activity, and even that is minimal. Most people, including those with sensitivities, should notice little to no irritation from pollen today. Looking ahead, this calm pattern is expected to hold steady over the next several days, with weed pollen staying low throughout. This lines up with the typical late-summer lull in the Bay Area, as spring tree pollen from oaks and birches has long since faded and the grass season has wound down, while weed pollen such as ragweed usually doesn't pick up in earnest until later in the fall. For now, conditions remain favorable for spending time outdoors with minimal pollen concerns.
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 weed pollen. The five-day outlook holds steady around 1 of 5.
- Is weed pollen high in San Mateo, CA right now?
- Weed pollen is very low today at 1 of 5, and it's past its peak season. Most people won't notice it.