Was the forecast right for Washington on Thu Sep 10?
Washington, District of Columbia · daily high temperature in °F · forecasts from each model's archived runs, verified against the DCA observations
14 days out, 4 models put Washington's Thu Sep 10 high anywhere from 70° to 94°;by the final call, the day before, the field had settled to a median of 89°. The day verified at 91° against the DCA observations — drizzle.
UKMO landed closest, off by 1.6°. ICON ran 8° cool.
What every model said, at every lead
Daily-high calls for Thu Sep 10 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 Washington scoreboard shows them, labeled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-26 | — | 90° | — | — | 90° | — | — | 90–90° |
| 14d · 2026-08-27 | 94° | 76° | 93° | — | 70° | — | — | 70–94° |
| 13d · 2026-08-28 | 86° | 86° | 100° | — | 93° | — | — | 86–100° |
| 12d · 2026-08-29 | 83° | 84° | 98° | — | 77° | — | — | 77–98° |
| 11d · 2026-08-30 | 88° | 79° | 85° | — | 81° | — | — | 79–88° |
| 10d · 2026-08-31 | 92° | 89° | 83° | — | 96° | — | — | 83–96° |
| 9d · 2026-09-01 | 92° | 94° | 97° | 92° | 89° | — | — | 89–97° |
| 8d · 2026-09-02 | 95° | 94° | 89° | 95° | 98° | — | — | 89–98° |
| 7d · 2026-09-03 | 87° | 92° | 88° | 94° | 89° | — | — | 87–94° |
| 6d · 2026-09-04 | 92° | 90° | 96° | 90° | 91° | 93° | 91° | 90–96° |
| 5d · 2026-09-05 | 88° | 89° | 91° | 88° | 95° | 93° | 88° | 88–95° |
| 4d · 2026-09-06 | 90° | 89° | 96° | 88° | 90° | 91° | 91° | 88–96° |
| 3d · 2026-09-07 | 89° | 87° | 95° | 90° | 91° | 85° | 89° | 85–95° |
| 2d · 2026-09-08 | 90° | 90° | 92° | 89° | 92° | 90° | 87° | 87–92° |
| 1d · 2026-09-09 | 88° | 89° | 89° | 89° | 88° | 83° | 89° | 83–89° |
| actual | 91° |
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 Washington — 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 DCA observations. The actual values are the ones in hand when this day was verified, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; verified days exist only for dates the archive watched arrive.