Low
Pollen is low — most people won't notice
Grass pollen is the main trigger · Tomorrow → · Updated 13 hours ago
Today in San Diego: grass pollen is very low, tree pollen is none, weed pollen is none. Overall score: 6/100. Allergies are unlikely for most people right now. Tomorrow is expected to be about the same. Updated at 11:01 PM.
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Pollen levels in San Diego are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: None. Grass pollen: Very Low. Weed pollen: None.
Tomorrow's pollen forecast for San Diego is expected to be about the same, with low pollen conditions.
Grass pollen is the highest supported pollen type in San Diego today. Grass pollen is very low.
Tree pollen in San Diego is none today.
Grass pollen in San Diego is very low today.
Weed pollen in San Diego is none today.
Tomorrow's pollen forecast for San Diego is expected to be about the same, with low pollen conditions.
San Diego's mild Mediterranean climate, coastal influence, and extended growing season create a nearly year-round allergy profile, with few hard freezes to provide relief between pollen seasons.
Tree pollen typically kicks off the cycle in late winter and peaks through spring, with oak, olive, mulberry, ash, sycamore, and juniper among the dominant offenders; non-native eucalyptus and pepper trees also contribute heavily across the county.
As trees wind down, grass pollen takes over from late spring into summer, driven primarily by Bermuda grass, ryegrass, and Kentucky bluegrass—Bermuda in particular can linger well into fall thanks to the region's warmth.
Weed season follows in late summer and autumn, led by ragweed, sagebrush, pigweed, Russian thistle (tumbleweed), and English plantain, with chaparral-native species releasing pollen from inland canyons and hillsides.
Overlap between lingering grasses and early weeds in late summer often intensifies symptoms for multi-sensitive sufferers.
Non-pollen triggers are equally important: dust mites thrive in coastal humidity, outdoor molds spike after winter rains, and Santa Ana winds can carry dust, particulates, and wildfire smoke across the region.
Overall, San Diego's allergy profile is defined by a long, layered season with significant tree and grass exposure and persistent environmental irritants.