Low
Pollen is low — most people won't notice
Grass pollen is the main trigger · Tomorrow → · Updated 13 hours ago
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Pollen levels in Tempe are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: None. Grass pollen: Moderate. Weed pollen: None.
Pollen conditions in Tempe are expected to remain similar tomorrow.
Tempe, Arizona, situated in the arid Sonoran Desert within the Phoenix metro area, has one of the most challenging allergy profiles in the United States, with near year-round pollen activity driven by mild winters, hot summers, and low humidity.
Tree pollen kicks off the heaviest season from February through April, dominated by non-native ornamentals such as mulberry, olive, ash, cottonwood, and sycamore, alongside native mesquite and palo verde, which peak later into May. Grass pollen overlaps with late tree season and intensifies from April through September, with Bermuda grass as the primary offender, supplemented by Johnson grass and rye. Weed pollen takes over in late summer and fall, running August through November, with ragweed, Russian thistle (tumbleweed), careless weed (pigweed), and sagebrush as major triggers.
The tree-to-grass and grass-to-weed transitions often compound symptoms for sensitized individuals.
Beyond pollen, Tempe's dry, dusty environment contributes significant non-pollen allergens, including wind-blown dust from haboobs, outdoor molds like Alternaria, and elevated ozone and particulate pollution trapped by the valley's geography. Cockroach and dust mite exposure indoors also remains relevant.
Overall, Tempe's allergy profile is defined by extended pollen seasons, dust-heavy air, and overlapping allergen windows that leave few true "off" months.