Outside Lands Music Festival takes place in Golden Gate Park in early August, and the weather at the event is one of the most consistently discussed topics among attendees. San Francisco in August is not warm; it is the heart of summer fog season, and Golden Gate Park, on the western edge of the city near the ocean, sits in one of the foggiest and windiest corridors in San Francisco. Temperatures during the festival typically range from 55 to 65 degrees Fahrenheit, often under overcast skies with a persistent westerly wind. There will be people in shorts and summer festival clothes, and there will be people in parkas, and neither group will be entirely wrong about what they packed. Understanding what weather to expect at Outside Lands, and why it is this way, helps you arrive prepared and actually enjoy the music rather than spend the weekend cold and surprised.
Golden Gate Park in August
Golden Gate Park runs east-west through the middle of San Francisco, from the Panhandle neighborhood near Haight-Ashbury all the way to Ocean Beach. The festival stages are primarily in the western half of the park, closest to the Pacific. This location is directly in the path of the afternoon sea breeze, the westerly onshore flow that accelerates through the park and across the open meadows where the stages are set. On a typical August afternoon, the wind at the Polo Fields and Hellman Hollow areas is 15 to 20 miles per hour, gusting to 25 during the strongest part of the sea breeze cycle. Combined with temperatures in the low 60s and occasional low cloud cover, this creates conditions that feel considerably colder than the raw temperature suggests.
The fog at Golden Gate Park in August follows the typical San Francisco summer fog pattern: present in the morning, sometimes burning off by midday, sometimes persisting through the afternoon, and returning in the evening as the marine air flows inland. Days when the fog burns off and stays off are genuinely pleasant: temperatures can climb to 68 or 70 degrees in direct sunlight with lighter wind. These days do happen during Outside Lands, and they produce the most enjoyable festival experience. But they are not the majority, and planning for a 62-degree overcast afternoon is more reliable than hoping for a 70-degree sunny one.
What to Wear and Pack
The standard festival advice applies here with extra emphasis: layers, layers, layers. A base layer for warmth, a mid-layer fleece or hoodie, and a wind-resistant outer layer covers most Outside Lands conditions. The evenings at the festival, from around 7 p.m. through the end of the night, are consistently cold. Temperatures drop to 55 degrees or below as the marine air flows in and the sun (if it ever appeared) sets. Experienced attendees know to bring a packable down jacket or a heavier fleece for the headliner sets, regardless of how the daytime weather felt.
A light rain jacket or wind shell is useful even when rain is not forecast, because the fog at Golden Gate Park can produce a light mist that is not quite rain but is enough to dampen clothing and make the cold feel worse. Footwear that can handle potentially damp grass is also worth considering: the meadow areas where festivalgoers congregate can be muddy if there has been any recent fog or unusual early-season rain, though August is typically dry.
Year-to-Year Variability
While the typical Outside Lands weekend is foggy and cool, there is meaningful year-to-year variation. In years with a weaker marine layer, the festival can see genuinely warm weather: 70 degrees or above, with sunshine and lighter wind. These years produce a dramatically different crowd experience, with sunscreen lines at the first aid tents replacing the usual jacket-wrestling in the crowd. In years with a particularly strong marine push, the festival can see persistent fog, cold wind, and temperatures in the upper 50s all day.
The festival falls during the peak of San Francisco's fog season, so the probability of a warm, sunny weekend is lower than the probability of a cool, foggy one. But "possible warm Outside Lands" is a real scenario, not a fantasy. Checking the forecast the week before the festival gives a reasonable indication of which type of weekend is coming; the marine layer's strength or weakness for a given year tends to persist for multiple days, making the week-ahead forecast more reliable for August in San Francisco than in more weather-variable climates.
Compared to Other Summer Festivals
Outside Lands stands out among major American music festivals for its cold August weather. Coachella in April is hot. Lollapalooza in Chicago in August is warm and humid. Bonnaroo in Tennessee in June is famously brutal heat. Outside Lands in San Francisco offers a very different challenge: the cold is the variable to plan for, not the heat. For attendees who have only experienced summer festivals in warmer climates, the advice is clear: do not pack for a normal summer festival. Pack for a cool fall outdoor event, because that is what Outside Lands actually is, regardless of the calendar date.