San Diego, CA Pollen Levels Today

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.