Was the forecast right for Seattle on Mon Jul 27?
Seattle, Washington · daily high temperature in °C · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
10 days out, 4 models put Seattle's Mon Jul 27 high anywhere from 19° to 27°; by the final call the field had settled to a median of 26°. The day verified at 26° against the ECMWF IFS analysis — cloudy.
GEM landed closest, off by 0.0°. AIFS ran 2° cold.
What every model said, at every lead
Daily-high calls for Mon Jul 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 |
|---|---|---|---|---|---|---|---|---|
| 10d · 2026-07-17 | 22° | 23° | 19° | — | 27° | — | — | 19–27° |
| 9d · 2026-07-18 | 24° | 22° | 25° | 25° | 27° | — | — | 22–27° |
| 8d · 2026-07-19 | 18° | 22° | 26° | 22° | 26° | — | — | 18–26° |
| 7d · 2026-07-20 | 22° | 25° | 24° | 21° | 29° | — | — | 21–29° |
| 6d · 2026-07-21 | 22° | 25° | 20° | 19° | 29° | 20° | 25° | 19–29° |
| 5d · 2026-07-22 | 23° | 24° | 24° | 22° | 28° | 18° | 23° | 18–28° |
| 4d · 2026-07-23 | 23° | 25° | 25° | 24° | 29° | 25° | 24° | 23–29° |
| 3d · 2026-07-24 | 24° | 25° | 24° | 24° | 28° | 24° | 25° | 24–28° |
| 2d · 2026-07-25 | 23° | 26° | 24° | 23° | 28° | 22° | 25° | 22–28° |
| 1d · 2026-07-26 | 24° | 25° | 24° | 26° | 25° | 25° | 25° | 24–26° |
| 0d · 2026-07-27 | 24° | 27° | 26° | 26° | 25° | 25° | 26° | 24–27° |
| actual | 26° |
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 ECMWF IFS analysis (temperature_2m_max). Archive depth varies by city; receipts exist only for dates the archive watched arrive.