Was the forecast right for San Diego on Fri Sep 4?
San Diego, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the SAN observations
10 days out, 4 models put San Diego's Fri Sep 4 high anywhere from 78° to 87°; by the final call the field had settled to a median of 79°. The day verified at 76° against the SAN observations — partly cloudy.
GFS landed closest, off by 0.0°. ECMWF ran 7° hot.
What every model said, at every lead
Daily-high calls for Fri Sep 4 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, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 10d · 2026-08-25 | 84° | 78° | 87° | — | 80° | — | — | 78–87° |
| 9d · 2026-08-26 | 81° | 78° | 79° | — | 82° | — | — | 78–82° |
| 8d · 2026-08-27 | 78° | 88° | 103° | 84° | 83° | — | — | 78–103° |
| 7d · 2026-08-28 | 92° | 79° | 96° | 83° | 79° | — | — | 79–96° |
| 6d · 2026-08-29 | 84° | 86° | 89° | 81° | 75° | 86° | — | 75–89° |
| 5d · 2026-08-30 | 83° | 85° | 88° | 78° | 79° | 78° | 76° | 76–88° |
| 4d · 2026-08-31 | 81° | 82° | 86° | 80° | 75° | 77° | 77° | 75–86° |
| 3d · 2026-09-01 | 80° | 80° | 85° | 78° | 76° | 79° | 80° | 76–85° |
| 2d · 2026-09-02 | 81° | 80° | 82° | 78° | 77° | 78° | 82° | 77–82° |
| 1d · 2026-09-03 | 80° | 79° | 84° | 79° | 76° | 78° | 83° | 76–84° |
| 0d · 2026-09-04 | 80° | 79° | 83° | 79° | 76° | 77° | 83° | 76–83° |
| actual | 76° |
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. Archive depth varies by city; receipts exist only for dates the archive watched arrive.