NOAA's New El Niño Update: 'Historic' Is Now on the Table for San Diego

When NOAA issued its El Niño Advisory back in July, we told you the picture would keep sharpening with each monthly update. The August update is out, and it didn't just sharpen — it escalated. NOAA's Climate Prediction Center now puts the odds of a very strong El Niño this fall and winter at greater than 90 percent, and for the first time it's putting a number on something bigger: a 69 percent chance of a historic event that would exceed the strength of previous El Niño events dating back to 1950.

Read that again. Not "one of the strongest." Stronger than anything in the modern record.

What Changed Since July

The August 13 update moved every number in the same direction:

• The "very strong" odds jumped. In July, NOAA gave an 81 percent chance of a very strong El Niño during October through December. That's now above 90 percent.
• "Historic" entered the conversation. NOAA now sees a 69 percent chance that ocean temperatures in the key monitoring region exceed +2.5°C above normal — territory no El Niño has reached since reliable records began in 1950.
• The ocean keeps warming. That monitoring region was running about 1.2°C above average in July. It's now at 1.4°C and climbing, with NOAA expecting strengthening through the end of the year and a peak during October through December.

Forecasters rarely talk this way. When the agency whose job is measured caution starts using the word "historic," it's worth paying attention.

What "Historic" Could Mean for San Diego Rain

Nobody can tell you how many inches will fall this winter — we've been consistent about that all season. But history gives us the range worth planning around. The strong El Niño of 1997-98 dropped 20.89 inches of rain on San Diego, roughly double our normal ten. The winter of 1982-83 brought 18.49 inches. Those remain the benchmark wet winters that longtime San Diego roofers still talk about — and NOAA is now saying this event has better-than-two-in-three odds of being stronger than either of them.

More rain isn't just a bigger total on the seasonal chart. It arrives as storm after storm, with saturated roofs that never fully dry out between systems. That's exactly the pattern that tests San Diego rooftops hardest, because small flaws that shrug off one quick shower fail under the fourth soaking in two weeks. Our deeper dive into how much rain El Niño winters really bring has the full history.

The Same Honest Caveat

Even at these odds, a forecast is still a forecast. NOAA's own update is careful to note that while impacts are more likely with an event this strong, they are not guaranteed. A 69 percent chance of historic means a 31 percent chance of merely very strong, and even a record-strength El Niño doesn't promise any particular storm on any particular weekend. We laid out why El Niño is about odds, not guarantees earlier this summer, and every word of it still applies.

But here's the thing about odds: you don't need certainty to act on them. You'd fix your brakes on a 69 percent chance of failure.

The Window to Prepare Is Narrowing

In July, we said homeowners had a comfortable head start. That's still true in mid-August — but the calendar only moves one direction, and so does demand. Every one of these NOAA updates makes the evening news, and every newscast sends another wave of homeowners to the phone. Inspection calendars across the county are filling in a way we usually don't see until October.

If your roof hasn't been looked at this year, the move is simple: get it inspected while the weather is still dry and repairs are easy to schedule. Cracked flashing, worn sealant, brittle underlayment, and clogged gutters are cheap fixes in August and emergencies in December. Our week-by-week prep timeline shows how to pace it, and if the inspection turns something up, our roof repair team can take care of it long before the first storm.

NOAA will issue its next monthly update on September 10, 2026. We'll keep tracking the numbers — but whichever way they move, the roofs that come through a historic winter fine are the ones that were ready before it started.

Want yours checked while the sun is still out? Request a free inspection or give us a call. We're a family-owned San Diego roofer, licensed and insured (CSLB #247618), serving San Diego since 1967 — and we'd rather see you this month than during the storm.