Was the forecast right for Seattle on Fri Aug 28?
Seattle, Washington · daily high temperature in °F · forecasts from each model's archived runs, verified against the SEA observations
5 days out, 7 models put Seattle's Fri Aug 28 high anywhere from 69° to 77°; by the final call the field had settled to a median of 72°. The day verified at 73° against the SEA observations — drizzle.
GEM landed closest, off by 0.1°. AIGFS ran 4° cold.
What every model said, at every lead
Daily-high calls for Fri Aug 28 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 |
|---|---|---|---|---|---|---|---|---|
| 5d · 2026-08-23 | 69° | 72° | 72° | 70° | 77° | 70° | 73° | 69–77° |
| 4d · 2026-08-24 | 68° | 70° | 70° | 69° | 75° | 72° | 72° | 68–75° |
| 3d · 2026-08-25 | 68° | 69° | 72° | 69° | 73° | 71° | 73° | 68–73° |
| 2d · 2026-08-26 | 68° | 70° | 72° | 69° | 69° | 72° | 72° | 68–72° |
| 1d · 2026-08-27 | 68° | 72° | 73° | 74° | 74° | 72° | 72° | 68–74° |
| 0d · 2026-08-28 | 69° | 69° | 72° | 73° | 75° | 72° | 73° | 69–75° |
| actual | 73° |
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.