Californian, San Diego Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Californian, San Diego is low; mold (cladosporium) is low.
Pollen Tomorrow
Tomorrow (12 October 2026) levels are similar to today.
7-Day Trend
Over the next week grass, mugwort, ragweed, and mold (alternaria) will increase; mold (cladosporium) will remain stable.
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Pollen Risk
Today - 11 October
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | None | 0/100 |
| Mold (Alternaria) | None | 0/100 |
| Mold (Cladosporium) | Low | 1/100 |
Tomorrow - 12 October
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | None | 0/100 | |
| Mold (Alternaria) | None | 0/100 | |
| Mold (Cladosporium) | Low | 1/100 |
Local Environmental Conditions
This part of San Diego sits among a blend of open water and built-up land. Oak heads the list of allergenic trees in the wider area, ahead of plane tree. Grasses, mugwort and pigweed growing in the surroundings are the main non-tree sources of pollen. Mugwort is unusually common here compared with most other locations, making it a particularly important local pollen source.
Tree pollen peaks in mid-spring, when the weather warms to around 15°C and oak and plane tree are in full flower. Grasses take over in early summer and keep pollen in the air into early fall. The most intense period comes through summer, when mugwort and pigweed are in flower. Rain is heaviest in spring, often giving short breaks from high pollen levels.
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Frequently Asked Questions About Pollen in California
Is pollen high in San Diego right now?
Currently, there is no significant pollen in San Diego.
Will pollen levels change in San Diego tomorrow?
On 12 October 2026, pollen conditions in San Diego will be similar to today with no significant pollen expected.
Is pollen expected to decrease in San Diego this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in San Diego?
On 11 October 2026, there are no significant pollen types in San Diego.
When is pollen season in San Diego?
How often is the San Diego pollen forecast updated?
The San Diego pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Diego come from nearby or far away?
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.
Are pollen levels in San Diego based on measurements or forecasts?
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.
Understanding the Scale
The 0–100 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
