San Diego pollen forecast — Mira Mesa HS's Baseball Diamond neighborhood

On 30 August 2026, overall pollen levels in San Diego are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels

On 31 August 2026, pollen conditions in San Diego will be different from today, with ambrosia at moderate levels, artemisia at low levels, grass at low levels

According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.

On 30 August 2026, Ambrosia is the dominant pollen source in San Diego. grass are also present but at lower levels. artemisia and cypress are not currently active.

Mira Mesa HS's Baseball Diamond tracks San Diego's broader pollen pattern, with olive and acacia appearing from January before eucalyptus peaks during February. Grass follows, peaking through March and April, while mugwort extends exposure into September. Onshore Pacific breezes periodically clear the air, though inland valleys can still see elevated counts, a defining feature of the local season.

The San Diego pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.

Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.

Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in San Diego, modern forecasts combine recent measurements, weather data, and information about local vegetation.

This allows us to estimate pollen levels for today and the coming days, not just report the past.

Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.