Was the forecast right for St. Louis on Thu Sep 17?
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 Thu Sep 17 high anywhere from 71° to 109°; by the final call the field had settled to a median of 96°. The day verified at 99° against the STL observations — drizzle.
GEM landed closest, off by 0.4°. ICON ran 5° cold.
What every model said, at every lead
Daily-high calls for Thu Sep 17 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 · 2026-09-02 | — | 74° | — | — | 78° | — | — | 74–78° |
| 14d · 2026-09-03 | 74° | 84° | — | — | 79° | — | — | 74–84° |
| 13d · 2026-09-04 | 77° | 71° | 84° | — | 109° | — | — | 71–109° |
| 12d · 2026-09-05 | 82° | 71° | 93° | — | 74° | — | — | 71–93° |
| 11d · 2026-09-06 | 90° | 80° | 78° | — | 74° | — | — | 74–90° |
| 10d · 2026-09-07 | 73° | 70° | 74° | — | 76° | — | — | 70–76° |
| 9d · 2026-09-08 | 93° | 92° | 80° | — | 98° | — | — | 80–98° |
| 8d · 2026-09-09 | 92° | 97° | 90° | 97° | 78° | — | — | 78–97° |
| 7d · 2026-09-10 | 91° | 77° | 77° | 93° | 74° | — | — | 74–93° |
| 6d · 2026-09-11 | 89° | 80° | 87° | 83° | 100° | 78° | — | 78–100° |
| 5d · 2026-09-12 | 85° | 89° | 98° | 94° | 94° | 96° | 95° | 85–98° |
| 4d · 2026-09-13 | 92° | 90° | 96° | 93° | 85° | 96° | 93° | 85–96° |
| 3d · 2026-09-14 | 94° | 93° | 98° | 94° | 99° | 96° | 94° | 93–99° |
| 2d · 2026-09-15 | 94° | 92° | 98° | 91° | 101° | 97° | 94° | 91–101° |
| 1d · 2026-09-16 | 93° | 92° | 98° | 96° | 98° | 96° | 95° | 92–98° |
| 0d · 2026-09-17 | 95° | 94° | 96° | 99° | 98° | 94° | 97° | 94–99° |
| actual | 99° |
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.