Was the forecast right for Seattle on Sun Sep 27?
Seattle, Washington · daily high temperature in °F · forecasts from each model's archived runs, verified against the SEA observations
14 days out, 4 models put Seattle's Sun Sep 27 high anywhere from 62° to 75°;by the final call, the day before, the field had settled to a median of 63°. The day verified at 65° against the SEA observations — cloudy.
UKMO landed closest, off by 0.1°. ECMWF ran 3° 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 Seattle scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-12 | — | 70° | — | — | 64° | — | — | 64–70° |
| 14d · 2026-09-13 | 62° | 72° | 75° | — | 75° | — | — | 62–75° |
| 13d · 2026-09-14 | 60° | 69° | 62° | — | 65° | — | — | 60–69° |
| 12d · 2026-09-15 | 61° | 62° | 56° | — | 62° | — | — | 56–62° |
| 11d · 2026-09-16 | 65° | 63° | 63° | — | 66° | — | — | 63–66° |
| 10d · 2026-09-17 | 65° | 66° | 64° | — | 72° | — | — | 64–72° |
| 9d · 2026-09-18 | 64° | 72° | 64° | 65° | 73° | — | — | 64–73° |
| 8d · 2026-09-19 | 64° | 68° | 58° | 66° | 67° | — | — | 58–68° |
| 7d · 2026-09-20 | 62° | 66° | 58° | 64° | 69° | 65° | — | 58–69° |
| 6d · 2026-09-21 | 64° | 62° | 61° | 62° | 54° | 62° | 65° | 54–65° |
| 5d · 2026-09-22 | 60° | 64° | 62° | 65° | 63° | 63° | 67° | 60–67° |
| 4d · 2026-09-23 | 63° | 65° | 61° | 65° | 66° | 62° | 65° | 61–66° |
| 3d · 2026-09-24 | 63° | 64° | 61° | 62° | 65° | 62° | 66° | 61–66° |
| 2d · 2026-09-25 | 63° | 63° | 61° | 66° | 66° | 61° | 66° | 61–66° |
| 1d · 2026-09-26 | 62° | 63° | 62° | 67° | 66° | 62° | 65° | 62–67° |
| actual | 65° |
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 Seattle — 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 SEA 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.