August 2026 CPI: the moderation is real, but the ground is still moving under it

Ellie hit fifth grade this month, which meant her school supply list ran about a page and a half of very specific requests — a certain brand of pencil, a specific style of folder, a graphing calculator that felt aggressive for a ten-year-old. Jenna and I did the shopping in one Saturday afternoon and I watched the total climb past $180 for one kid.

Last year I remember it being around $150 for the same kid at the same grade level. So I did what I do now: I went to the actual CPI report instead of just complaining.

The August release came out on the 11th. The headline number — the year-over-year CPI everyone quotes — is live on the macro page, so I won't pin a number down here. What I want to write about instead is the shape of it. Because the headline can moderate while the ground underneath is still moving, and that's exactly what I think is happening right now.

The headline moderated. The momentum did something else.

Here's the thing to notice when you read any CPI release: there are actually three different questions the number is answering.

Question one — the annual rate. CPI YoY. Prices this August vs prices last August. This is the headline. It's a full-year lookback so it smooths a lot of noise. It's also stale by design — a spike from October last year is still baked into it until this October rolls off.

Question two — the recent momentum. What have prices done in the last three months, annualized? This is the number the Fed actually watches, because it tells you what the trend line is right now, not what it was averaged across a full year that included last winter's food shock.

Question three — the composition. Which parts of the basket are running hot and which are running cold. Because the average is doing a lot of hiding.

The macro page breaks these apart. When I looked at August, the story I saw was: the YoY line is coming down slowly and steadily. But the 3-month annualized number is running hotter than the YoY. That combination has a specific meaning — the recent trend is stronger than the annual average, which usually means the YoY will stop falling soon, or start climbing again.

That's the "moderation is real, but the ground is moving under it" part. The headline is well-behaved. The undercurrent is not.

Where PPI is pointing

The producer side of the story is worth watching more carefully than usual right now.

PPI leads CPI by two to six months on average. Tariff costs, freight, wholesale food — when those move at the factory gate, they show up on the shelf a quarter or two later. And PPI's momentum has been climbing since the winter tariff round took effect.

I'm not going to lock in a projection number here because a linear extrapolation of momentum is not a real forecast — the macro page shows what the simple math says the next three months look like if recent momentum keeps up, but real projections would need to model wages, energy, base effects, and expectations. What the linear number is useful for is a directional check: it tells you whether the honest read of the last six months of data is pointing up, down, or sideways.

Right now — pointing modestly up on both CPI and PPI. Not a spike. Not a crisis. A drift.

What's actually hot in the basket

The single biggest weight in CPI is shelter — roughly a third of the whole index — and shelter has been the stubborn part of the story for two years now. It's cooling, but it's still the reason CPI hasn't returned to 2%. If you own a home at a fixed rate from 2019-2021, this line is invisible to you. If you rent, it's basically your entire inflation experience.

Food at home came off the boil earlier in the year but the late-summer produce runs — Ellie's school lunch stuff, Sam's endless yogurt intake — put us back in the neighborhood of last year. Eggs finally settled after the 2024-2025 bird-flu chaos; the current print is much closer to normal than it was six months ago. Coffee is still elevated but the second-year drought pass-through is finally in the rearview.

Energy has been the friendly line lately. Gas prices are lower than they were this time last year in most of the country. That's saving Jenna and me real money on the CR-V's monthly fuel bill, and it's the reason the headline CPI is looking as moderate as it does. Take gas out of the basket and the picture is a shade less comfortable.

Tariff-adjacent goods — appliances, some electronics, imported apparel — are the line that's been quietly reaccelerating. It's a small share of the basket by weight, but it's the one you notice at the register when you're actually shopping for a specific thing. That $180 school supply bill wasn't a shelter story. It was a "the calculator got seventeen dollars more expensive since last year" story, and a "the specific paper Ellie needed came from a factory that's paying more for pulp" story.

What it means at the kitchen table

I keep coming back to the same three questions Jenna and I run through when a new CPI print comes out.

Are our raises keeping up? For the moment, roughly yes — nominal wage growth is running above CPI. Real income is slightly positive. That's the difference between "we feel squeezed" and "we're actually falling behind." At the moment, we're not falling behind. It's close, though.

Are our savings keeping up? This one I'm still occasionally embarrassed about. We moved the emergency fund into a high-yield savings account earlier this year, which is now paying roughly in line with CPI. Before that move, we were losing meaningful buying power to inflation every year we let it sit in the regular checking account.

Where is our basket different from the average basket? Grocery inflation and school-supply inflation hit us harder than the average family because of the kids. Gas is running favorable because I'm not commuting far. Shelter is invisible because our mortgage is fixed. The state pages break the same commodities out with Ohio-specific numbers — my basket doesn't look like the national basket, and it probably doesn't look like yours either.

What to watch next month

Three things on my personal radar between now and the September release in mid-October.

PPI's finished goods line. If it moderates, the tariff pass-through story starts to look like it's mostly baked in. If it climbs another leg, we're going to see more of it at retail through Q4.

The Fed meeting. A CPI that stops falling makes the case for further rate cuts weaker. Anyone with a variable-rate loan should be watching this closely.

Shelter. Still the stickiest single number in the whole report. The day shelter breaks below 3% YoY is the day the headline can plausibly return to the Fed's 2% target. Not before.

The macro page has the live version of all of this — the current CPI and PPI YoY, the momentum reading, the CPI-PPI spread, and the simple projection I mentioned. I check it now when a release drops the way I used to check the weather.

A $180 school supply bill isn't a catastrophe. But it's the kind of number that stops being noise once you know what's driving it. And the point of doing any of this — running a website, writing these posts, sitting down with Jenna on a Sunday to actually look at the numbers — is to stop letting normal-looking receipts pass unexamined. That's the whole game.