Was the forecast right for San Diego on Thu Sep 10?
San Diego, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the SAN observations
14 days out, 4 models put San Diego's Thu Sep 10 high anywhere from 75° to 90°;by the final call, the day before, the field had settled to a median of 91°. The day verified at 86° against the SAN observations — cloudy.
ICON landed closest, off by 0.8°. ECMWF ran 10° warm.
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 San Diego scoreboard shows them, labeled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-26 | — | 76° | — | — | 75° | — | — | 75–76° |
| 14d · 2026-08-27 | 87° | 75° | 90° | — | 76° | — | — | 75–90° |
| 13d · 2026-08-28 | 88° | 86° | 79° | — | 76° | — | — | 76–88° |
| 12d · 2026-08-29 | 80° | 84° | 84° | — | 78° | — | — | 78–84° |
| 11d · 2026-08-30 | 81° | 79° | 90° | — | 83° | — | — | 79–90° |
| 10d · 2026-08-31 | 76° | 77° | 77° | — | 79° | — | — | 76–79° |
| 9d · 2026-09-01 | 83° | 76° | 87° | 75° | 79° | — | — | 75–87° |
| 8d · 2026-09-02 | 83° | 78° | 94° | 78° | 72° | — | — | 72–94° |
| 7d · 2026-09-03 | 89° | 89° | 95° | 80° | 80° | — | — | 80–95° |
| 6d · 2026-09-04 | 92° | 89° | 94° | 90° | 80° | 88° | 80° | 80–94° |
| 5d · 2026-09-05 | 90° | 90° | 95° | 90° | 82° | 86° | 87° | 82–95° |
| 4d · 2026-09-06 | 89° | 89° | 96° | 90° | 81° | 86° | 96° | 81–96° |
| 3d · 2026-09-07 | 91° | 89° | 98° | 88° | 78° | 88° | 91° | 78–98° |
| 2d · 2026-09-08 | 91° | 88° | 96° | 87° | 78° | 88° | 91° | 78–96° |
| 1d · 2026-09-09 | 93° | 91° | 96° | 88° | 80° | 87° | 92° | 80–96° |
| actual | 86° |
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 San Diego — 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 SAN 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.