Was the forecast right for St. Louis on Sat Aug 29?
St. Louis, Missouri · daily high temperature in °F · forecasts from each model's archived runs, verified against the STL observations
4 days out, 7 models put St. Louis's Sat Aug 29 high anywhere from 83° to 94°; by the final call the field had settled to a median of 88°. The day verified at 88° against the STL observations — cloudy.
AIGFS landed closest, off by 0.2°. GFS ran 5° hot.
What every model said, at every lead
Daily-high calls for Sat Aug 29 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 |
|---|---|---|---|---|---|---|---|---|
| 4d · 2026-08-25 | 83° | 85° | 88° | 84° | 94° | 86° | 86° | 83–94° |
| 3d · 2026-08-26 | 84° | 86° | 88° | 88° | 93° | 88° | 86° | 84–93° |
| 2d · 2026-08-27 | 84° | 84° | 90° | 86° | 92° | 87° | 84° | 84–92° |
| 1d · 2026-08-28 | 86° | 85° | 88° | 89° | 92° | 88° | 89° | 85–92° |
| 0d · 2026-08-29 | 86° | 88° | 87° | 91° | 93° | 88° | 89° | 86–93° |
| actual | 88° |
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.