Was the forecast right for Atlanta on Sun Sep 27?
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 Sun Sep 27 high anywhere from 76° to 90°;by the final call, the day before, the field had settled to a median of 80°. The day verified at 81° against the ATL observations — cloudy.
ICON landed closest, off by 0.1°. GEM ran 4° cool.
What every model said, at every lead
Daily-high calls for Sun Sep 27 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 · 2026-09-12 | — | 76° | — | — | 67° | — | — | 67–76° |
| 14d · 2026-09-13 | 90° | 83° | 77° | — | 76° | — | — | 76–90° |
| 13d · 2026-09-14 | 88° | 82° | 78° | — | 83° | — | — | 78–88° |
| 12d · 2026-09-15 | 82° | 90° | 76° | — | 94° | — | — | 76–94° |
| 11d · 2026-09-16 | 74° | 80° | 77° | — | 74° | — | — | 74–80° |
| 10d · 2026-09-17 | 80° | 76° | 81° | — | 81° | — | — | 76–81° |
| 9d · 2026-09-18 | 78° | 80° | 75° | 77° | 77° | — | — | 75–80° |
| 8d · 2026-09-19 | 80° | 76° | 79° | 83° | 81° | — | — | 76–83° |
| 7d · 2026-09-20 | 77° | 79° | 79° | 79° | 80° | — | — | 77–80° |
| 6d · 2026-09-21 | 79° | 80° | 76° | 80° | 84° | 83° | 78° | 76–84° |
| 5d · 2026-09-22 | 80° | 79° | 81° | 77° | 79° | 82° | 77° | 77–82° |
| 4d · 2026-09-23 | 81° | 79° | 81° | 80° | 76° | 82° | 79° | 76–82° |
| 3d · 2026-09-24 | 80° | 79° | 79° | 76° | 82° | 76° | 78° | 76–82° |
| 2d · 2026-09-25 | 80° | 79° | 78° | 76° | 82° | 78° | 79° | 76–82° |
| 1d · 2026-09-26 | 80° | 80° | 79° | 77° | 83° | 81° | 80° | 77–83° |
| actual | 81° |
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.