Phoenix pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Phoenix is high; ragweed is high; grass and mugwort are moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort remains moderate, ragweed remains high, grass increasing.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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Features and forecast availability vary by region.
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 | 47/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 35/100 |
| Ragweed (Ambrosia) | High | 65/100 |
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) | High | 53/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 40/100 | |
| Ragweed (Ambrosia) | High | 70/100 |
Local Environmental Conditions
Phoenix's irrigated desert landscape differs markedly from most US cities, with introduced olive, mulberry, and cypress as the dominant allergenic tree pollen sources across residential streets and parks. Native desert vegetation including palo verde and mesquite contribute additional pollen seasonally. Exposure varies between greener irrigated residential areas and the more arid urban core, with the flat, open desert basin allowing pollen to disperse widely under prevailing winds.
Phoenix's pollen season differs markedly from most US cities, with introduced olive, mulberry, and cypress producing intense spring pollen from February through April. Native desert species including palo verde and mesquite contribute seasonally. The long, hot, dry summer suppresses mid-season pollen, with a secondary grass peak possible after summer monsoon rains. The flat desert basin concentrates pollen under calm conditions during spring.
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Resource Hub
Pollen forecast neighborhoods 11 neighborhoods
Sports venues in Phoenix 1 sports venue
Popular Local Routes 12 routes
Frequently Asked Questions About Pollen in Arizona
Is pollen high in Phoenix right now?
On 20 September 2026, overall pollen levels in Phoenix are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Phoenix tomorrow?
On 21 September 2026, pollen conditions in Phoenix will be different from today, with ambrosia at high levels, artemisia at moderate levels and grass increasing
Is pollen expected to decrease in Phoenix this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Phoenix?
On 20 September 2026, Ambrosia is the dominant pollen source in Phoenix. artemisia and grass are also present but at lower levels.
When is pollen season in Phoenix?
How often is the Phoenix pollen forecast updated?
The Phoenix pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Phoenix 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 Phoenix 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 Phoenix, 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).
