Tree Pollen Count in San Marcos, CA

Pollen by type in San Marcos

• San Marcos grass pollen count
• San Marcos ragweed pollen count
• San Marcos pollen count

What is the tree pollen count in San Marcos today?

The San Marcos tree pollen index today is 20 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

San Marcos’s overall pollen count today is 24 (Low) across all types. See the full San Marcos pollen count for the overall index and every type together.

San Marcos is a city in San Diego County, California. Its population is 94,078 (ACS 2023).

San Marcos Tree Pollen Count: 5-Day Forecast

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows San Marcos’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving San Marcos’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 20 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting San Marcos now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for San Marcos. The type summary stands: tree pollen reads 20 (Low) today.

In the California pattern, the plants that typically shape this city’s year are winter and spring trees, late-spring grasses and late-summer weeds — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this tree pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Trees build through spring, with planted olive peaking from March into May. This month sits outside the usual tree pollen window for the California pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The California allergy season guide singles out planted olive and the Central Valley’s concentrated spring pollen.

San Marcos allergies today

San Marcos allergies today are set by the same reading as the San Marcos pollen count today: the Total Pollen Index is 24 (Low), and the tree pollen index on this page is 20 (Low) of it. When people ask about San Marcos allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for San Marcos.

Allergies in San Marcos follow the California calendar set out on the full San Marcos page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in San Marcos before heading outdoors, the tree pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the San Marcos allergy forecast for the tree pollen season: it shows whether San Marcos allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.