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Santa Monica's coastal Mediterranean climate produces a long, overlapping allergy season rather than sharply defined peaks, with ocean breezes sometimes masking pollen loads that remain moderately elevated nearly year-round.
Tree pollen typically dominates from February through May, driven by non-native ornamentals and regional natives including coast live oak, olive, sycamore, ash, mulberry, pine, and juniper, with oak and olive often producing the most intense springtime spikes.
As trees taper, grass pollen takes over from late April into July, fueled by Bermuda, ryegrass, fescue, and Kentucky bluegrass common in lawns, parks, and nearby open spaces; warm, dry afternoons paired with onshore winds can extend grass symptoms well into summer.
Weed pollen becomes the main driver in late summer and fall, with ragweed, sagebrush, pigweed, Russian thistle, and plantain active from August through October.
The late-spring overlap of lingering tree pollen with emerging grasses is a particularly symptomatic window for many residents.
Non-pollen triggers also play a significant role: coastal humidity supports outdoor mold (especially Alternaria and Cladosporium), indoor dust mites thrive near the shore, and vehicle-related air pollution from the 10 and PCH can worsen reactions.
Overall, Santa Monica's profile is defined by mild intensity but unusually long duration across nearly all allergen categories.