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…
01
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 91 °F on Tue, 5 PM, against a low of 76 °F — a swing of 16 °F across the window. SOUTHERN is the heaviest area at 94 °F.
Plotted window Oct 12, 7:00 PM CDT → Oct 13, 7:00 PM CDT. Reissued with each load-forecast vintage; the latest is shown. Source snapshot Oct 12, 7:05 PM CDT.
Every line above, and who produced it.
A published forecast for the plotted target intervals. 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 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mon, 10/12 |
| Zone | Peak (°F) | Peak hour | Low (°F) | Average (°F) |
|---|---|---|---|---|
| SOUTHERN | 94 | Tue, 4 PM | 80 | 86 |
| NORTH | 92 | Tue, 4 PM | 74 | 82 |
| NORTH_CENTRAL | 92 | Tue, 5 PM | 76 | 83 |
| WEST | 92 | Tue, 5 PM | 73 | 82 |
| SOUTH_CENTRAL | 91 | Tue, 4 PM | 76 | 83 |
| EAST | 90 | Tue, 3 PM | 75 | 82 |
| FAR_WEST | 90 | Mon, 7 PM | 72 | 81 |
| COAST | 89 | Tue, 2 PM | 78 | 83 |
| Series | Produced by | Method | Horizon | Issued |
|---|---|---|---|---|
| Average across zones | ERCOT | ERCOT temperature forecast by weather zone | As far as the operator publishes, hourly | Issue time not exposed by this feed |
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 one important input to ERCOT's load forecast and is published alongside it. A temperature miss can contribute to a demand miss, but calendar effects, humidity, economic activity, distributed generation, and other model inputs can also matter.
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.
| Tue, 10/13 |
|---|
Darkest cells are the tightest hours. The window peaks at 91 °F on Tue, 5 PM, local to the market.