El Niño Reaches Super Category, Raising Southern California Flood Risks

What changed

The 2026 El Niño has reached the “very strong” or “super” category and may intensify through the fall. On September 21, central Pacific sea-surface temperatures were 3.11°C above average, exceeding the previous reported record of 3.08°C; one NOAA model projects a peak near 4°C above average in November.

That raises the odds of heavy surf, higher tides and flooding in Southern California. It does not guarantee the region an exceptionally wet winter.

Why it matters

The useful takeaway is preparation without prediction theater. A powerful El Niño can create atmospheric conditions that favor heavy winter rain in Southern California, but the last super El Niño, in 2015–16, was widely expected to deliver a very wet season there and did not.

That makes the current forecast a risk signal, not a promise. Coastal communities may face rougher surf and higher tides, while flood-prone inland areas could be exposed if substantial rain arrives. Families should treat the possibility of extreme weather seriously even while scientists remain cautious about the final rainfall outcome.

Climate change has also made the old El Niño shortcut less dependable. Researchers say additional warm-water patterns in the Pacific now complicate the link between ocean temperatures and California’s winter rain. The event could become one of the strongest in the modern observational record, but whether it rivals the estimated 1877–78 El Niño remains uncertain.