Was the forecast right for Los Angeles on Mon Sep 28?
Los Angeles, California · daily high temperature in °C · forecasts from each model's archived runs, verified against the FHMC1 observations
13 days out, 4 models put Los Angeles's Mon Sep 28 high anywhere from 28° to 34°;by the final call, the day before, the field had settled to a median of 27°. The day verified at 28° against the FHMC1 observations — partly cloudy.
GEM landed closest, off by 0.1°. AIFS ran 3° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 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 Los Angeles scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-13 | — | 26° | — | — | 24° | — | — | 24–26° |
| 14d · 2026-09-14 | 24° | 25° | — | — | 26° | — | — | 24–26° |
| 13d · 2026-09-15 | 28° | 28° | 28° | — | 34° | — | — | 28–34° |
| 12d · 2026-09-16 | 24° | 25° | 28° | — | 28° | — | — | 24–28° |
| 11d · 2026-09-17 | 26° | 27° | 26° | — | 33° | — | — | 26–33° |
| 10d · 2026-09-18 | 26° | 30° | 34° | — | 36° | — | — | 26–36° |
| 9d · 2026-09-19 | 29° | 25° | 33° | 27° | 29° | — | — | 25–33° |
| 8d · 2026-09-20 | 26° | 29° | 29° | 30° | 31° | — | — | 26–31° |
| 7d · 2026-09-21 | 22° | 25° | 27° | 31° | 30° | — | — | 22–31° |
| 6d · 2026-09-22 | 28° | 26° | 26° | 27° | 25° | 31° | — | 25–31° |
| 5d · 2026-09-23 | 23° | 27° | 29° | 28° | 30° | 28° | 27° | 23–30° |
| 4d · 2026-09-24 | 25° | 26° | 28° | 27° | 29° | 31° | 27° | 25–31° |
| 3d · 2026-09-25 | 26° | 25° | 28° | 29° | 27° | 28° | 28° | 25–29° |
| 2d · 2026-09-26 | 26° | 26° | 28° | 29° | 28° | 28° | 28° | 26–29° |
| 1d · 2026-09-27 | 26° | 26° | 28° | 28° | 27° | 27° | 28° | 26–28° |
| actual | 28° |
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.