Was the forecast right for London on Fri Aug 28?
London, England · daily high temperature in °F · forecasts from each model's archived runs, verified against the EGLL observations
6 days out, 7 models put London's Fri Aug 28 high anywhere from 63° to 73°;by the final call, the day before, the field had settled to a median of 74°. The day verified at 77° against the EGLL observations, with 0.02 in of precipitation — drizzle.
GFS landed closest, off by 1.2°. AIGFS ran 6° cool.
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 London scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 6d · 2026-08-22 | 71° | 70° | 70° | 63° | 73° | 73° | 66° | 63–73° |
| 5d · 2026-08-23 | 72° | 70° | 73° | 66° | 75° | 68° | 66° | 66–75° |
| 4d · 2026-08-24 | 71° | 73° | 73° | 70° | 66° | 77° | 75° | 66–77° |
| 3d · 2026-08-25 | 73° | 72° | 70° | 72° | 77° | 71° | 70° | 70–77° |
| 2d · 2026-08-26 | 73° | 71° | 71° | 69° | 76° | 73° | 72° | 69–76° |
| 1d · 2026-08-27 | 72° | 70° | 72° | 74° | 76° | 74° | 75° | 70–76° |
| 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 London — 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 EGLL 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.