Was the forecast right for San Francisco on Fri Aug 28?
San Francisco, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the SFOC1 observations
6 days out, 6 models put San Francisco's Fri Aug 28 high anywhere from 64° to 74°; by the final call the field had settled to a median of 66°. The day verified at 68° against the SFOC1 observations — drizzle.
AIFS landed closest, off by 0.4°. GFS ran 6° hot.
What every model said, at every lead
Daily-high calls for Fri Aug 28 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 Francisco scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 6d · 2026-08-22 | 72° | 74° | 66° | 64° | 70° | 64° | — | 64–74° |
| 5d · 2026-08-23 | 69° | 77° | 63° | 64° | 68° | 64° | 63° | 63–77° |
| 4d · 2026-08-24 | 69° | 71° | 63° | 64° | 68° | 61° | 72° | 61–72° |
| 3d · 2026-08-25 | 69° | 73° | 66° | 66° | 71° | 64° | 66° | 64–73° |
| 2d · 2026-08-26 | 69° | 72° | 67° | 64° | 68° | 64° | 64° | 64–72° |
| 1d · 2026-08-27 | 67° | 72° | 64° | 64° | 66° | 63° | 64° | 63–72° |
| 0d · 2026-08-28 | 68° | 73° | 64° | 64° | 74° | 66° | 66° | 64–74° |
| actual | 68° |
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 Francisco — 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 SFOC1 observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.