Calexico Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Calexico is moderate; ragweed, mold (alternaria), and mold (cladosporium) are moderate; grass is low.
Pollen Tomorrow
Tomorrow (12 October 2026) ragweed remains moderate, mold (alternaria) remains moderate, mold (cladosporium) remains moderate, grass no longer expected.
7-Day Trend
Over the next week grass, mugwort, ragweed, mold (alternaria), and mold (cladosporium) will increase.
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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) | Low | 8/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 50/100 |
| Mold (Alternaria) | Moderate | 43/100 |
| Mold (Cladosporium) | Moderate | 29/100 |
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) | Moderate | 42/100 | |
| Mold (Alternaria) | Moderate | 49/100 | |
| Mold (Cladosporium) | Moderate | 42/100 |
Local Environmental Conditions
The area around the center of Calexico is mostly built-up land, with some bare ground. Lawns and planted trees in a nearby park add to local grass and tree pollen. Around here, street trees, gardens and lawns supply most pollen in the built-up parts. Grasses along roadsides, verges and open ground also add to the overall pollen load.
Grasses take over in mid-spring, with temperatures around 20°C, and their pollen lingers into mid-fall. Weeds on open ground add a smaller late peak from early summer into early fall. In this dry climate, pollen can linger in the air for long spells without rain. Actual levels on any given day depend on the weather, with dry, breezy days the worst and wet days the mildest.
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Frequently Asked Questions About Pollen in California
Is pollen high in Calexico right now?
On 11 October 2026, overall pollen levels in Calexico are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Calexico tomorrow?
On 12 October 2026, pollen conditions in Calexico will be different from today, with ambrosia at moderate levels
Is pollen expected to decrease in Calexico 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 Calexico?
On 11 October 2026, Ambrosia is the dominant pollen source in Calexico. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Calexico?
How often is the Calexico pollen forecast updated?
The Calexico pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Calexico 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 Calexico 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 Calexico, 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. |
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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).
