How San Diego Upwelling Affects Water Temperature and Paddling Season

San Diego’s paddling season doesn’t end when summer does—it transforms. The reason lies in a oceanographic phenomenon called upwelling, a seasonal pattern that pulls cold, nutrient-rich water from the Pacific depths to the surface. Understanding how upwelling works will help you plan your paddling calendar, choose the right gear, and know exactly when conditions shift.

What Is Upwelling and Why It Happens Here

Upwelling occurs when strong winds blow parallel to the coast, pushing surface water away from shore. This creates a vacuum that pulls deeper, colder water up to replace it. In San Diego, upwelling is most intense from April through September, driven by consistent northwesterly winds that dominate our spring and summer months.

The California Current, which flows south along our coast, reinforces this process. Cold water from the north meets warmer subtropical water, and the mechanical push of wind-driven currents creates the perfect conditions for upwelling along our beaches and reefs.

Water Temperature by Season

Winter (November–March): Water temperatures hover between 55–60°F. This is when San Diego’s Pacific is at its warmest relative to summer, thanks to minimal upwelling. Paradoxically, winter brings the most comfortable paddling temperatures for most athletes, though air temperature and swell energy make other conditions more challenging.

Spring (April–June): As upwelling begins, temperatures drop rapidly from 60°F to 52–55°F. By June, expect 50–54°F water at popular breaks like Sunset Cliffs, Pacific Beach, and Mission Beach. This is when many paddlers switch from minimal wetsuits to 3/2mm suits.

Summer (July–September): Peak upwelling months. Water temperatures plummet to 48–52°F, with the coldest readings typically in August and early September. La Jolla Shores and Torrey Pines often show the most dramatic cooling due to their exposure to offshore wind corridors. This is also when the most nutrient-rich water arrives—great for marine life, challenging for comfort.

Fall (October): Upwelling begins to weaken as winds ease and water starts to rebound. Temperatures climb from 52°F back toward 58–60°F by November, making October a unique sweet spot for some paddlers seeking warmer water without losing swell energy.

How Upwelling Extends Your Paddling Season

The key insight: upwelling creates distinct conditions that favor different paddling goals.

Summer paddlers benefit from consistent swells and reliable wind patterns that upwelling brings. Smaller, more manageable waves often develop on upwelling days, making spots like Crystal Pier and Tourmaline Surf Park accessible for intermediate paddlers. The cold water keeps you alert and pushes fitness—there’s no coasting through a summer paddle session.

Fall and winter athletes experience warmer water and larger, more powerful swells. Upwelling’s absence means fewer nitpicky wind-driven texture changes and more predictable forecasting. However, you’re trading comfort for intensity.

The real win: upwelling makes San Diego a year-round paddling destination. You don’t need to migrate south or take a break. You simply adjust your wetsuit, adapt your expectations, and keep paddling.

Practical Implications for Your Gear and Planning

If you paddle year-round in San Diego:

• April–September: Invest in a quality 3/2mm or 4/3mm wetsuit. Booties become essential by July. Gloves are optional but help many paddlers in August.
• October–March: A 2/2mm shorty or spring suit usually suffices, though some prefer no suit in November–December.
• Thermal rash guards: Wear one under your wetsuit April–September to reduce flushing and add an extra insulation layer without bulk.

Upwelling also affects which breaks suit your skill level and goals. Summer’s colder water and consistent conditions make protected bays like Mission Bay ideal for beginners, while fall and winter’s larger swells and warmer water draw advanced paddlers to more exposed reefs and points.

Monitoring Upwelling for Your Sessions

Upwelling intensity correlates with wind speed and direction. Strong northwesterly winds (15+ knots) signal strong upwelling. You’ll notice water clarity improving, marine life activity increasing (dolphins, seals, kelp), and temperatures dropping noticeably within 24–48 hours of sustained wind.

Watch for “upwelling shadows”—areas where headlands block the wind and create pockets of warmer water. San Diego Point and Mission Point often stay 2–3°F warmer than exposed beaches during peak upwelling.

The Bottom Line

San Diego’s upwelling season isn’t something to endure—it’s an opportunity. The cold water, consistent conditions, and extended paddling window from April through September create some of the most reliable paddling in Southern California. Respect the cold, choose appropriate gear, and you’ll unlock four months of exceptional conditions.

Use the Element app to track real-time water temperature, wind patterns, and swell forecasts so you can anticipate upwelling shifts and dial in your paddling schedule throughout the year.