Was the forecast right for Los Angeles on Mon Sep 7?
Los Angeles, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the FHMC1 observations
14 days out, 4 models put Los Angeles's Mon Sep 7 high anywhere from 75° to 89°;by the final call, the day before, the field had settled to a median of 90°. The day verified at 93° against the FHMC1 observations — thunderstorms.
ICON landed closest, off by 0.2°. AIFS ran 8° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 7 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 |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-23 | — | 80° | — | — | 90° | — | — | 80–90° |
| 14d · 2026-08-24 | 78° | 75° | 79° | — | 89° | — | — | 75–89° |
| 13d · 2026-08-25 | 84° | 80° | 90° | — | 78° | — | — | 78–90° |
| 12d · 2026-08-26 | 83° | 77° | 85° | — | 92° | — | — | 77–92° |
| 11d · 2026-08-27 | 84° | 78° | 92° | — | 86° | — | — | 78–92° |
| 10d · 2026-08-28 | 84° | 87° | 92° | — | 90° | — | — | 84–92° |
| 9d · 2026-08-29 | 87° | 87° | 90° | 88° | 94° | — | — | 87–94° |
| 8d · 2026-08-30 | 86° | 89° | 82° | 86° | 86° | — | — | 82–89° |
| 7d · 2026-08-31 | 85° | 85° | 93° | 89° | 85° | — | — | 85–93° |
| 6d · 2026-09-01 | 86° | 86° | 86° | 83° | 87° | 93° | 95° | 83–95° |
| 5d · 2026-09-02 | 86° | 82° | 86° | 93° | 86° | 86° | 93° | 82–93° |
| 4d · 2026-09-03 | 89° | 87° | 88° | 93° | 89° | 90° | 88° | 87–93° |
| 3d · 2026-09-04 | 88° | 88° | 86° | 92° | 88° | 92° | 89° | 86–92° |
| 2d · 2026-09-05 | 89° | 91° | 89° | 93° | 90° | 95° | 91° | 89–95° |
| 1d · 2026-09-06 | 85° | 90° | 86° | 95° | 89° | 93° | 92° | 85–95° |
| actual | 93° |
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. The actual values are the ones in hand when this receipt was settled, usually 4 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.