Was the forecast right for Los Angeles on Tue Sep 8?
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 Tue Sep 8 high anywhere from 22° to 33°; by the final call the field had settled to a median of 35°. The day verified at 33° against the FHMC1 observations, with 0.5 mm of precipitation — rain.
AIFS landed closest, off by 0.9°. GEM ran 3° hot.
What every model said, at every lead
Daily-high calls for Tue Sep 8 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 · 2026-08-24 | — | 23° | — | — | 31° | — | — | 23–31° |
| 14d · 2026-08-25 | 29° | 24° | — | — | 26° | — | — | 24–29° |
| 13d · 2026-08-26 | 25° | 22° | 33° | — | 29° | — | — | 22–33° |
| 12d · 2026-08-27 | 32° | 31° | 31° | — | 23° | — | — | 23–32° |
| 11d · 2026-08-28 | 35° | 33° | 30° | — | 34° | — | — | 30–35° |
| 10d · 2026-08-29 | 32° | 26° | 33° | — | 33° | — | — | 26–33° |
| 9d · 2026-08-30 | 29° | 30° | 30° | — | 28° | — | — | 28–30° |
| 8d · 2026-08-31 | 32° | 32° | 33° | 31° | 29° | — | — | 29–33° |
| 7d · 2026-09-01 | 27° | 28° | 28° | 28° | 31° | — | — | 27–31° |
| 6d · 2026-09-02 | 29° | 26° | 29° | 31° | 29° | 32° | — | 26–32° |
| 5d · 2026-09-03 | 33° | 30° | 34° | 33° | 30° | 35° | 35° | 30–35° |
| 4d · 2026-09-04 | 34° | 34° | 31° | 35° | 32° | 33° | 32° | 31–35° |
| 3d · 2026-09-05 | 35° | 34° | 35° | 36° | 34° | 33° | 29° | 29–36° |
| 2d · 2026-09-06 | 35° | 35° | 30° | 37° | 35° | 37° | 33° | 30–37° |
| 1d · 2026-09-07 | 33° | 34° | 30° | 38° | 34° | 35° | 35° | 30–38° |
| 0d · 2026-09-08 | 34° | 34° | 31° | 36° | 35° | 35° | 35° | 31–36° |
| actual | 33° |
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.