Was the forecast right for London on Thu Sep 24?
London, England · daily high temperature in °F · forecasts from each model's archived runs, verified against the EGLL observations
14 days out, 4 models put London's Thu Sep 24 high anywhere from 66° to 77°;by the final call, the day before, the field had settled to a median of 71°. The day verified at 72° against the EGLL observations — cloudy.
ECMWF landed closest, off by 0.8°. AIGFS ran 4° cool.
What every model said, at every lead
Daily-high calls for Thu Sep 24 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 |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-09 | — | 77° | — | — | 75° | — | — | 75–77° |
| 14d · 2026-09-10 | 71° | 66° | 77° | — | 68° | — | — | 66–77° |
| 13d · 2026-09-11 | 72° | 68° | 57° | — | 72° | — | — | 57–72° |
| 12d · 2026-09-12 | 68° | 63° | 66° | — | 75° | — | — | 63–75° |
| 11d · 2026-09-13 | 71° | 58° | 69° | — | 65° | — | — | 58–71° |
| 10d · 2026-09-14 | 65° | 63° | 81° | — | 80° | — | — | 63–81° |
| 9d · 2026-09-15 | 71° | 67° | 79° | 74° | 68° | — | — | 67–79° |
| 8d · 2026-09-16 | 68° | 64° | 71° | 69° | 70° | — | — | 64–71° |
| 7d · 2026-09-17 | 65° | 68° | 70° | 74° | 70° | — | — | 65–74° |
| 6d · 2026-09-18 | 68° | 69° | 67° | 70° | 78° | 66° | 66° | 66–78° |
| 5d · 2026-09-19 | 66° | 67° | 67° | 69° | 70° | 67° | 61° | 61–70° |
| 4d · 2026-09-20 | 70° | 66° | 66° | 73° | 67° | 75° | 67° | 66–75° |
| 3d · 2026-09-21 | 71° | 63° | 69° | 67° | 68° | 67° | 65° | 63–71° |
| 2d · 2026-09-22 | 69° | 67° | 71° | 71° | 73° | 68° | 67° | 67–73° |
| 1d · 2026-09-23 | 69° | 68° | 72° | 71° | 71° | 70° | 71° | 68–72° |
| actual | 72° |
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.