Was the forecast right for Seattle on Wed Sep 2?
Seattle, Washington · daily high temperature in °F · forecasts from each model's archived runs, verified against the SEA observations
10 days out, 4 models put Seattle's Wed Sep 2 high anywhere from 66° to 78°; by the final call the field had settled to a median of 66°. The day verified at 70° against the SEA observations, with 0.23 in of precipitation — rain.
GEM landed closest, off by 1.4°. AIGFS ran 6° cold.
What every model said, at every lead
Daily-high calls for Wed Sep 2 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 |
|---|---|---|---|---|---|---|---|---|
| 10d · 2026-08-23 | 66° | 68° | 66° | — | 78° | — | — | 66–78° |
| 9d · 2026-08-24 | 62° | 56° | 67° | 61° | 68° | — | — | 56–68° |
| 8d · 2026-08-25 | 65° | 56° | 66° | 65° | 60° | — | — | 56–66° |
| 7d · 2026-08-26 | 64° | 58° | 62° | 61° | 58° | — | — | 58–64° |
| 6d · 2026-08-27 | 61° | 61° | 64° | 60° | 58° | 60° | 63° | 58–64° |
| 5d · 2026-08-28 | 64° | 59° | 66° | 64° | 62° | 64° | 63° | 59–66° |
| 4d · 2026-08-29 | 62° | 66° | 70° | 61° | 65° | 62° | 63° | 61–70° |
| 3d · 2026-08-30 | 62° | 66° | 65° | 64° | 72° | 63° | 62° | 62–72° |
| 2d · 2026-08-31 | 63° | 64° | 65° | 66° | 65° | 63° | 68° | 63–68° |
| 1d · 2026-09-01 | 63° | 64° | 66° | 67° | 68° | 66° | 68° | 63–68° |
| 0d · 2026-09-02 | 65° | 64° | 67° | 71° | 67° | 65° | 66° | 64–71° |
| actual | 70° |
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. Archive depth varies by city; receipts exist only for dates the archive watched arrive.