Was the forecast right for Los Angeles on Tue Sep 1?
Los Angeles, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the FHMC1 observations
9 days out, 4 models put Los Angeles's Tue Sep 1 high anywhere from 82° to 92°; by the final call the field had settled to a median of 80°. The day verified at 84° against the FHMC1 observations — clear.
GFS landed closest, off by 0.0°. AIGFS ran 7° cold.
What every model said, at every lead
Daily-high calls for Tue Sep 1 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 Los Angeles scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 9d · 2026-08-23 | 83° | 82° | 92° | — | 87° | — | — | 82–92° |
| 8d · 2026-08-24 | 83° | 81° | 84° | 80° | 85° | — | — | 80–85° |
| 7d · 2026-08-25 | 72° | 81° | 83° | 83° | 88° | — | — | 72–88° |
| 6d · 2026-08-26 | 76° | 81° | 81° | 82° | 87° | 87° | — | 76–87° |
| 5d · 2026-08-27 | 84° | 82° | 82° | 88° | 88° | 86° | 82° | 82–88° |
| 4d · 2026-08-28 | 83° | 84° | 86° | 78° | 88° | 88° | 80° | 78–88° |
| 3d · 2026-08-29 | 83° | 82° | 85° | 87° | 87° | 88° | 79° | 79–88° |
| 2d · 2026-08-30 | 81° | 82° | 85° | 85° | 87° | 90° | 83° | 81–90° |
| 1d · 2026-08-31 | 80° | 79° | 82° | 85° | 85° | 88° | 78° | 78–88° |
| 0d · 2026-09-01 | 80° | 77° | 80° | 85° | 84° | 88° | 77° | 77–88° |
| actual | 84° |
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 Los Angeles — 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 FHMC1 observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.