Was the forecast right for San Antonio on Sun Sep 20?
San Antonio, Texas · daily high temperature in °F · forecasts from each model's archived runs, verified against the SAT observations
13 days out, 4 models put San Antonio's Sun Sep 20 high anywhere from 91° to 98°; by the final call the field had settled to a median of 94°. The day verified at 94° against the SAT observations — drizzle.
UKMO landed closest, off by 0.4°. GFS ran 3° warm.
What every model said, at every lead
Daily-high calls for Sun Sep 20 as each model's runs approached it — the last archived run per day. NBM and The Spread's own blend are consensus products and stay out of these ranges and rankings; the San Antonio scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-05 | — | 92° | — | — | 98° | — | — | 92–98° |
| 14d · 2026-09-06 | 90° | 79° | — | — | 92° | — | — | 79–92° |
| 13d · 2026-09-07 | 98° | 91° | 92° | — | 96° | — | — | 91–98° |
| 12d · 2026-09-08 | 93° | 87° | 89° | — | 98° | — | — | 87–98° |
| 11d · 2026-09-09 | 92° | 93° | 96° | — | 100° | — | — | 92–100° |
| 10d · 2026-09-10 | 92° | 86° | 89° | — | 94° | — | — | 86–94° |
| 9d · 2026-09-11 | 96° | 94° | 97° | — | 82° | — | — | 82–97° |
| 8d · 2026-09-12 | 95° | 87° | 81° | 97° | 99° | — | — | 81–99° |
| 7d · 2026-09-13 | 95° | 93° | 94° | 94° | 98° | — | — | 93–98° |
| 6d · 2026-09-14 | 95° | 93° | 95° | 95° | 96° | 98° | — | 93–98° |
| 5d · 2026-09-15 | 95° | 93° | 94° | 94° | 98° | 98° | 95° | 93–98° |
| 4d · 2026-09-16 | 94° | 93° | 96° | 93° | 98° | 96° | 94° | 93–98° |
| 3d · 2026-09-17 | 94° | 94° | 97° | 94° | 96° | 97° | 93° | 93–97° |
| 2d · 2026-09-18 | 94° | 94° | 97° | 93° | 99° | 98° | 93° | 93–99° |
| 1d · 2026-09-19 | 94° | 94° | 96° | 92° | 98° | 96° | 93° | 92–98° |
| 0d · 2026-09-20 | 93° | 94° | 93° | 94° | 97° | 93° | 94° | 93–97° |
| actual | 94° |
Read it honestly
This is one date, not a league table. A model can win a day it deserved to lose; rankings only mean something over a window. For that, see which model has been most accurate in San Antonio — or every city The Spread scores.
Forecasts are what each model's archived runs said at the time, captured at The Spread's sweep times — never reconstructed after the fact. Truth is the SAT observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.