Live market data
ERCOT temperature forecast
ERCOT's own weather forecast, zone by zone — the input behind every demand number on this site.
Fetching the latest published forecast…
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ERCOT's own weather forecast, zone by zone — the input behind every demand number on this site.
How hot will each Texas weather zone get?
ERCOT forecast temperature peaks at 98 °F on Fri, 5 PM, against a low of 76 °F — a swing of 22 °F across the window. NORTH_CENTRAL is the heaviest area at 100 °F.
Plotted window Aug 28, 2:00 AM CDT → Aug 29, 2:00 AM CDT. Reissued with each load-forecast vintage; the latest is shown.
Every line above, and who produced it.
The grid operator's own published forecast for these hours. Source: ERCOT.
The same window, split by zone — each area’s own curve.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fri, 8/28 |
| Zone | Peak (°F) | Peak hour | Low (°F) | Average (°F) |
|---|---|---|---|---|
| NORTH_CENTRAL | 100 | Fri, 4 PM | 78 | 89 |
| SOUTH_CENTRAL | 100 | Fri, 5 PM | 78 | 88 |
| SOUTHERN | 99 | Fri, 3 PM | 79 | 88 |
| WEST | 99 | Fri, 5 PM | 74 | 86 |
| EAST | 98 | Fri, 4 PM | 74 | 86 |
| Forecast | Produced by | Method | Horizon |
|---|---|---|---|
| Average across zones | ERCOT | ERCOT temperature forecast by weather zone | As far as the operator publishes, hourly |
A point forecast with no confidence interval, and the error compounds downstream: a two-degree miss across a whole footprint moves the demand forecast by more than most people expect, which is why the load forecast is read alongside this rather than on its own.
The temperature ERCOT is forecasting for each of the eight ERCOT weather zones, plus the average across them. This is the operator's own weather call, published with its load forecast rather than taken from a separate weather service — so it is the same input the demand forecast was built from.
Temperature is the input ERCOT's load forecast is built on, and it is published alongside it. When the demand forecast misses badly, this is almost always what missed first — which is why it is worth reading before the load forecast rather than after it.
Watch the spread between zones. A heat wave that covers every zone at once is a very different demand event from one sitting over Houston alone, and the eight-zone breakdown is where that shows.
curl "https://askthegrid.com/api/v1/grid/radar/curves?iso=ERCOT&horizon=extended"
Connect your agent to mcp.askthegrid.com and this forecast is a tool call away — the same host Claude and ChatGPT connectors already use.
It is the weather forecast the grid operator itself publishes and builds its demand forecast on. That makes it more useful than a general forecast for this purpose: it is the exact input behind the load numbers, at the zone boundaries the market actually uses.
Because its load forecast depends on it. Publishing the weather input alongside the demand output lets anyone check whether a demand forecast moved because the grid changed or because the weather call did.
A great deal, and non-linearly. Past a comfort band, each additional degree adds more demand than the last, because more air conditioning or heating switches on and runs for longer — which is why forecast error matters most on the days that are already extreme.
| Sat, 8/29 |
|---|
Darkest cells are the tightest hours. The window peaks at 98 °F on Fri, 5 PM, local to the market.
| FAR_WEST |
|---|
| 98 |
| Fri, 5 PM |
| 74 |
| 86 |
| NORTH | 98 | Fri, 4 PM | 72 | 85 |
|---|
| COAST | 94 | Fri, 3 PM | 79 | 86 |
|---|