Was the forecast right for Atlanta on Sun Aug 9?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against ERA5
13 days out, 4 models put Atlanta's Sun Aug 9 high anywhere from 87° to 97°; by the final call the field had settled to a median of 89°. ERA5 says the day verified at 91° with 0.05 in of precipitation — drizzle.
UKMO landed closest, off by 0.1°. GEM ran 3° cold.
What every model said, at every lead
Daily-high calls for Sun Aug 9 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 |
|---|---|---|---|---|---|---|---|---|
| 13d · 2026-07-27 | 89° | 87° | 89° | — | 97° | — | — | 87–97° |
| 12d · 2026-07-28 | 85° | 86° | 88° | — | 92° | — | — | 85–92° |
| 11d · 2026-07-29 | 86° | 91° | 90° | — | 100° | — | — | 86–100° |
| 10d · 2026-07-30 | 86° | 87° | 93° | — | 93° | — | — | 86–93° |
| 9d · 2026-07-31 | 86° | 81° | 95° | — | 94° | — | — | 81–95° |
| 8d · 2026-08-01 | 86° | 83° | 92° | 84° | 84° | — | — | 83–92° |
| 7d · 2026-08-02 | 84° | 84° | 82° | 83° | 95° | — | — | 82–95° |
| 6d · 2026-08-03 | 86° | 85° | 88° | 81° | 96° | 91° | — | 81–96° |
| 5d · 2026-08-04 | 86° | 86° | 89° | 85° | 94° | 88° | 96° | 85–96° |
| 4d · 2026-08-05 | 88° | 88° | 89° | 87° | 90° | 91° | 94° | 87–94° |
| 3d · 2026-08-06 | 88° | 89° | 90° | 88° | 96° | 92° | 93° | 88–96° |
| 2d · 2026-08-07 | 88° | 88° | 88° | 90° | 93° | 92° | 94° | 88–94° |
| 1d · 2026-08-08 | 89° | 90° | 90° | 89° | 94° | 91° | 92° | 89–94° |
| 0d · 2026-08-09 | 89° | 91° | 91° | 87° | 89° | 89° | 91° | 87–91° |
| actual | 91° |
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 ERA5 reanalysis (temperature_2m_max). Archive depth varies by city; receipts exist only for dates the archive watched arrive.