August Monsoon Swells in San Diego: Tropical Storm Remnant Waves Explained
August is the most unpredictable month for San Diego surfers—and that’s exactly why it matters. While summer typically brings small, mushy waves, late July and August can deliver something entirely different: monsoon-driven swells that travel thousands of miles from tropical storm systems spinning off Baja California and Mexico. Understanding how these swells form and where to find them will transform your August lineup.
How Monsoon Swells Reach San Diego
Tropical storms and hurricanes that develop in the eastern Pacific (roughly between June and October) spin counterclockwise. As they weaken moving northwestward toward or past Baja, they send organized swell lines racing across open ocean toward Southern California. These aren’t the result of the storm hitting San Diego directly—that’s rare. Instead, the storm’s energy propagates outward as long-period swells that can travel 1,000+ miles in 48–72 hours.
The key difference from typical Pacific swell: monsoon swells carry warm water and often arrive with south-southwest to south wind directions. They also tend to have longer periods (12–16+ seconds) compared to standard West Coast groundswell, which means they hold shape better and create more defined wave faces.
August is prime season because the Eastern Pacific is most active then. Tropical systems form regularly enough that San Diego typically sees at least one solid monsoon swell window during the month, sometimes two.
Where to Surf August Monsoon Swells
Not all San Diego breaks work equally well during monsoon season. South-facing and southwest-facing reefs and beaches are your priority.
Swami’s (Encinitas) is a reliable option during monsoon swells. The south-facing aspect means it picks up swell that would be blocked at north-facing breaks. It handles a wider range of swell directions and can produce quality waves when other spots are flat or blown out.
Blacks Beach (La Jolla) faces southwest and performs exceptionally well during monsoon season. The beach break can handle head-high to overhead sets when the swell is organized, and the sandy bottom is forgiving for less experienced surfers. Parking and access are limited, but the waves justify the effort during active monsoon windows.
Torrey Pines (the beach break north of the cliffs) faces southwest and often goes unnoticed by local crowds. During monsoon swells, it can fire when more famous breaks are either too crowded or inconsistent.
Sunset Cliffs (Ocean Beach area) faces southwest and works well for experienced surfers during organized monsoon swells. The break is better for summer conditions than winter, and August monsoons can produce clean, shapeable waves.
Windansea (La Jolla) has some southwest exposure and works during monsoon season, though it’s more crowded and the shallow reef demands respect.
Avoid north-facing breaks like Sunset Cliffs’ north side, Oceanside Pier, and Carlsbad during monsoon swells—the swell angle will either not reach them or hit them weakly.
Timing and Forecasting
Monsoon swells don’t arrive on a predictable schedule like winter groundswell. You need to monitor the Eastern Pacific actively from mid-July through September.
Watch for tropical depression or storm formations off the coast of Mexico or Central America. Once a system is named and tracked, estimate how long it will take the swell to reach San Diego—typically 48–96 hours depending on the storm’s location and intensity. The National Hurricane Center and swell forecasting models (Magic Seaweed, Surfline, NOAA) are essential tools.
The best monsoon swells arrive when the system is strong enough to generate significant energy but far enough away that San Diego isn’t in the direct path. A tropical storm south of Baja that’s moving northwest is ideal. A hurricane directly threatening San Diego usually means dangerous conditions onshore and offshore—not a fun session.
August typically sees the most consistent monsoon activity because tropical systems are most frequent then. By September, the pattern often breaks down, and October is too late for reliable monsoon energy before the Pacific winter swell season takes over.
What to Expect
August monsoon swells usually run 4–8 feet (Hawaiian scale) at their peak, sometimes larger. They arrive with south or southwest wind, which is offshore at many San Diego breaks. This offshore wind creates clean, defined wave faces—a huge advantage over the onshore winds that plague summer months.
The swell window is typically 24–72 hours of rideable waves, depending on how close the system tracked to San Diego and how quickly it moves away. Multiple swell pulses from the same system are common; you might see a solid day, a small lull, then another peak 12–24 hours later.
Water temperature in August is 65–68°F, so a boardshort is comfortable for most surfers.
Bottom Line
August monsoon swells are the secret to avoiding the summer slump. They’re not guaranteed, but they’re predictable enough to plan around if you’re watching forecasts actively. South-facing breaks like Swami’s, Blacks Beach, and Torrey Pines are your go-to spots, and long-period swell with offshore wind often means better shape than you’d expect in August.
Use the Element app to track swell forecasts, wind direction, and water temperature throughout August. You’ll be ready the moment a monsoon system starts spinning up in the Eastern Pacific.