Was the forecast right for San Diego on Fri Sep 18?
San Diego, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the SAN observations
13 days out, 4 models put San Diego's Fri Sep 18 high anywhere from 77° to 95°; by the final call the field had settled to a median of 77°. The day verified at 78° against the SAN observations — partly cloudy.
ICON landed closest, off by 0.5°. ECMWF ran 4° hot.
What every model said, at every lead
Daily-high calls for Fri Sep 18 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 |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-03 | — | 74° | — | — | 81° | — | — | 74–81° |
| 14d · 2026-09-04 | — | 85° | — | — | 79° | — | — | 79–85° |
| 13d · 2026-09-05 | 77° | 88° | 95° | — | 80° | — | — | 77–95° |
| 12d · 2026-09-06 | 86° | 74° | 83° | — | 79° | — | — | 74–86° |
| 11d · 2026-09-07 | 83° | 89° | 87° | — | 82° | — | — | 82–89° |
| 10d · 2026-09-08 | 80° | 78° | 91° | — | 81° | — | — | 78–91° |
| 9d · 2026-09-09 | 80° | 73° | 84° | — | 79° | — | — | 73–84° |
| 8d · 2026-09-10 | 80° | 81° | 87° | 82° | 81° | — | — | 80–87° |
| 7d · 2026-09-11 | 81° | 81° | 88° | 81° | 82° | — | — | 81–88° |
| 6d · 2026-09-12 | 80° | 80° | 84° | 80° | 81° | 83° | — | 80–84° |
| 5d · 2026-09-13 | 79° | 77° | 84° | 79° | 77° | 79° | 80° | 77–84° |
| 4d · 2026-09-14 | 78° | 76° | 83° | 78° | 76° | 79° | 80° | 76–83° |
| 3d · 2026-09-15 | 78° | 75° | 82° | 78° | 76° | 79° | 80° | 75–82° |
| 2d · 2026-09-16 | 77° | 75° | 81° | 77° | 75° | 78° | 79° | 75–81° |
| 1d · 2026-09-17 | 77° | 75° | 81° | 77° | 75° | 78° | 79° | 75–81° |
| 0d · 2026-09-18 | 77° | 76° | 82° | 77° | 76° | 78° | 79° | 76–82° |
| actual | 78° |
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.