Was the forecast right for Atlanta on Tue Sep 8?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against the ATL observations
14 days out, 4 models put Atlanta's Tue Sep 8 high anywhere from 79° to 98°;by the final call, the day before, the field had settled to a median of 87°. The day verified at 88° against the ATL observations — drizzle.
ECMWF landed closest, off by 0.1°. GEM ran 4° cool.
What every model said, at every lead
Daily-high calls for Tue Sep 8 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 Atlanta scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-24 | — | 83° | — | — | 87° | — | — | 83–87° |
| 14d · 2026-08-25 | 86° | 89° | 79° | — | 98° | — | — | 79–98° |
| 13d · 2026-08-26 | 84° | 86° | 89° | — | 93° | — | — | 84–93° |
| 12d · 2026-08-27 | 84° | 92° | 98° | — | 102° | — | — | 84–102° |
| 11d · 2026-08-28 | 83° | 83° | 91° | — | 95° | — | — | 83–95° |
| 10d · 2026-08-29 | 90° | 82° | 89° | — | 79° | — | — | 79–90° |
| 9d · 2026-08-30 | 82° | 87° | 88° | 85° | 98° | — | — | 82–98° |
| 8d · 2026-08-31 | 82° | 82° | 96° | 81° | 88° | — | — | 81–96° |
| 7d · 2026-09-01 | 85° | 87° | 86° | 85° | 91° | — | — | 85–91° |
| 6d · 2026-09-02 | 86° | 86° | 87° | 84° | 90° | 86° | 86° | 84–90° |
| 5d · 2026-09-03 | 85° | 86° | 88° | 84° | 89° | 88° | 88° | 84–89° |
| 4d · 2026-09-04 | 84° | 86° | 82° | 81° | 89° | 87° | 88° | 81–89° |
| 3d · 2026-09-05 | 83° | 85° | 87° | 82° | 90° | 87° | 86° | 82–90° |
| 2d · 2026-09-06 | 84° | 85° | 83° | 83° | 90° | 86° | 84° | 83–90° |
| 1d · 2026-09-07 | 86° | 87° | 88° | 84° | 90° | 89° | 87° | 84–90° |
| 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 Atlanta — 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 ATL observations. The actual values are the ones in hand when this receipt was settled, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.