Was the forecast right for San Francisco on Tue Aug 25?
San Francisco, California · daily high temperature in °F · forecasts from each model's archived runs, verified against the SFOC1 observations
3 days out, 7 models put San Francisco's Tue Aug 25 high anywhere from 64° to 74°;by the final call, the day before, the field had settled to a median of 69°. The day verified at 70° against the SFOC1 observations — cloudy.
GFS landed closest, off by 1.0°. ICON ran 6° cool.
What every model said, at every lead
Daily-high calls for Tue Aug 25 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 |
|---|---|---|---|---|---|---|---|---|
| 3d · 2026-08-22 | 73° | 73° | 67° | 64° | 70° | 66° | 74° | 64–74° |
| 2d · 2026-08-23 | 73° | 74° | 67° | 65° | 70° | 65° | 72° | 65–74° |
| 1d · 2026-08-24 | 73° | 74° | 66° | 65° | 69° | 64° | 72° | 64–74° |
| actual | 70° |
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. The actual values are the ones in hand when this receipt was settled, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.