Was the forecast right for San Diego on Mon Sep 21?
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 Mon Sep 21 high anywhere from 78° to 87°;by the final call, the day before, the field had settled to a median of 75°. The day verified at 77° against the SAN observations — drizzle.
ICON landed closest, off by 0.3°. GFS ran 3° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 21 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 · 2026-09-06 | — | 82° | — | — | 75° | — | — | 75–82° |
| 14d · 2026-09-07 | 81° | 87° | 78° | — | 78° | — | — | 78–87° |
| 13d · 2026-09-08 | 81° | 80° | 88° | — | 75° | — | — | 75–88° |
| 12d · 2026-09-09 | 82° | 87° | 82° | — | 77° | — | — | 77–87° |
| 11d · 2026-09-10 | 77° | 79° | 82° | — | 74° | — | — | 74–82° |
| 10d · 2026-09-11 | 78° | 76° | 81° | — | 79° | — | — | 76–81° |
| 9d · 2026-09-12 | 76° | 77° | 85° | 80° | 76° | — | — | 76–85° |
| 8d · 2026-09-13 | 76° | 77° | 79° | 75° | 74° | — | — | 74–79° |
| 7d · 2026-09-14 | 76° | 76° | 77° | 75° | 73° | — | — | 73–77° |
| 6d · 2026-09-15 | 76° | 75° | 77° | 77° | 73° | 78° | 78° | 73–78° |
| 5d · 2026-09-16 | 76° | 74° | 79° | 77° | 73° | 77° | 76° | 73–79° |
| 4d · 2026-09-17 | 74° | 74° | 80° | 76° | 73° | 77° | 75° | 73–80° |
| 3d · 2026-09-18 | 75° | 74° | 80° | 75° | 73° | 77° | 76° | 73–80° |
| 2d · 2026-09-19 | 75° | 74° | 80° | 76° | 72° | 77° | 77° | 72–80° |
| 1d · 2026-09-20 | 75° | 74° | 80° | 75° | 74° | 77° | 76° | 74–80° |
| actual | 77° |
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.