San Francisco pollen forecast — Painted Ladies neighborhood

On 9 August 2026, overall pollen levels in San Francisco are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

On 10 August 2026, pollen conditions in San Francisco will be different from today, with ambrosia at medium levels and artemisia continuing to decline

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

On 9 August 2026, Ambrosia is the dominant pollen source in San Francisco. artemisia and grass are also present but at lower levels. cypress are not currently active.

As a landmark within San Francisco, Painted Ladies follows the same seasonal pollen curve, opening with acacia and oak from January then olive follows, running through February and March. Grass pollen then peaks through March and April, and light weed pollen continues into early autumn. The region's Mediterranean pattern keeps winters mild and wet, springs pollen-heavy, and summers largely pollen-free, a defining feature of the local season.

The San Francisco 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 Francisco, 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.