Redwoods peek above a blanket of gray as fog rolls into Bay Area valleys, dripping down to nourish ferns and mosses below. In San Francisco, tourists shiver in the billowing gloom, fooled by the promise of California sunshine as foghorns bellow from the Golden Gate Bridge. Coastal fog is most abundant in the summer, seeding nicknames such as Karl, May Gray, June Gloom, No-Sky July, and Fogust as it envelops coastal forests and cities alike in its damp, chilly embrace.

“August is about the peak of the fog season,” says Daniel Fernandez, fog researcher and environmental science professor at California State University, Monterey Bay.

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Guananí Gómez–Van Cortright is a writer and science educator and was Bay Nature’s first editorial fellow from 2022 to 2023. She graduated from the UC Santa Cruz science communication master’s program and currently performs puppet shows about singing arthropods, among other things, at the California Academy of Sciences. She enjoys foggy walks, sculpting ceramic skulls, and romping around at the tidepools.