Redondo Beach pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Redondo Beach is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains moderate, ragweed remains high, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| 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) | Moderate | 36/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 8/100 |
| Ragweed (Ambrosia) | High | 70/100 |
Tomorrow - 21 September
| 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) | Moderate | 27/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | High | 63/100 |
Local Environmental Conditions
Redondo Beach's South Bay Los Angeles coastal setting features Torrey pine, eucalyptus, and Monterey cypress as the main tree pollen sources, with exposure varying between the coastal bluff parks and the more built-up commercial corridors inland. The strong and consistent Pacific marine layer creates one of the most distinctly stratified pollen environments in Southern California, with significantly lower exposure in the immediate beachfront areas compared to inland neighborhoods.
Redondo Beach's South Bay Los Angeles coastal setting produces one of California's most moderated pollen seasons. Oak and olive open in January before grass peaks through March and April. Mugwort extends exposure into September, while the strong marine influence from the Pacific moderates temperatures year-round and onshore ocean breezes frequently disperse pollen across this oceanfront city throughout the season.
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Frequently Asked Questions About Pollen in California
Is pollen high in Redondo Beach right now?
On 20 September 2026, overall pollen levels in Redondo Beach are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Redondo Beach tomorrow?
On 21 September 2026, pollen conditions in Redondo Beach will be different from today, with grass at moderate levels, ambrosia at high levels
Is pollen expected to decrease in Redondo Beach this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Redondo Beach?
On 20 September 2026, Ambrosia is the dominant pollen source in Redondo Beach. grass and artemisia are also present but at lower levels.
When is pollen season in Redondo Beach?
How often is the Redondo Beach pollen forecast updated?
The Redondo Beach pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Redondo Beach 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 Redondo Beach 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 Redondo Beach, 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 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
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).
