Was the forecast right for St. Louis on Sat Sep 12?
St. Louis, Missouri · daily high temperature in °F · forecasts from each model's archived runs, verified against the STL observations
13 days out, 4 models put St. Louis's Sat Sep 12 high anywhere from 75° to 83°; by the final call the field had settled to a median of 90°. The day verified at 92° against the STL observations — partly cloudy.
ICON landed closest, off by 1.3°. AIFS ran 5° cold.
What every model said, at every lead
Daily-high calls for Sat Sep 12 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 St. Louis scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-28 | — | 89° | — | — | 92° | — | — | 89–92° |
| 14d · 2026-08-29 | 77° | 100° | — | — | 98° | — | — | 77–100° |
| 13d · 2026-08-30 | 83° | 76° | 75° | — | 78° | — | — | 75–83° |
| 12d · 2026-08-31 | 77° | 78° | 75° | — | 98° | — | — | 75–98° |
| 11d · 2026-09-01 | 82° | 82° | 98° | — | 100° | — | — | 82–100° |
| 10d · 2026-09-02 | 97° | 93° | 86° | — | 100° | — | — | 86–100° |
| 9d · 2026-09-03 | 81° | 100° | 69° | — | 103° | — | — | 69–103° |
| 8d · 2026-09-04 | 78° | 96° | 91° | 95° | 106° | — | — | 78–106° |
| 7d · 2026-09-05 | 87° | 84° | 96° | 87° | 97° | — | — | 84–97° |
| 6d · 2026-09-06 | 87° | 86° | 88° | 85° | 94° | 86° | — | 85–94° |
| 5d · 2026-09-07 | 86° | 88° | 85° | 87° | 97° | 87° | 86° | 85–97° |
| 4d · 2026-09-08 | 84° | 86° | 87° | 81° | 94° | 85° | 91° | 81–94° |
| 3d · 2026-09-09 | 87° | 88° | 91° | 84° | 92° | 88° | 88° | 84–92° |
| 2d · 2026-09-10 | 88° | 87° | 86° | 86° | 94° | 88° | 90° | 86–94° |
| 1d · 2026-09-11 | 88° | 88° | 86° | 94° | 95° | 89° | 89° | 86–95° |
| 0d · 2026-09-12 | 87° | 90° | 88° | 94° | 94° | 91° | 89° | 87–94° |
| actual | 92° |
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 St. Louis — 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 STL observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.