Was the forecast right for Philadelphia on Sat Sep 26?
Philadelphia, Pennsylvania · daily high temperature in °F · forecasts from each model's archived runs, verified against the PHL observations
14 days out, 4 models put Philadelphia's Sat Sep 26 high anywhere from 70° to 78°;by the final call, the day before, the field had settled to a median of 66°. The day verified at 68° against the PHL observations, with 0.42 in of precipitation — showers.
GEM landed closest, off by 0.4°. AIGFS ran 5° cool.
What every model said, at every lead
Daily-high calls for Sat Sep 26 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 Philadelphia scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-11 | — | 70° | — | — | 77° | — | — | 70–77° |
| 14d · 2026-09-12 | 78° | 70° | 74° | — | 70° | — | — | 70–78° |
| 13d · 2026-09-13 | 79° | 76° | 71° | — | 76° | — | — | 71–79° |
| 12d · 2026-09-14 | 74° | 79° | 76° | — | 67° | — | — | 67–79° |
| 11d · 2026-09-15 | 76° | 78° | 72° | — | 82° | — | — | 72–82° |
| 10d · 2026-09-16 | 73° | 76° | 71° | — | 68° | — | — | 68–76° |
| 9d · 2026-09-17 | 61° | 72° | 63° | 69° | 58° | — | — | 58–72° |
| 8d · 2026-09-18 | 64° | 68° | 71° | 60° | 73° | — | — | 60–73° |
| 7d · 2026-09-19 | 78° | 73° | 67° | 62° | 64° | — | — | 62–78° |
| 6d · 2026-09-20 | 72° | 73° | 62° | 70° | 68° | 62° | 70° | 62–73° |
| 5d · 2026-09-21 | 64° | 72° | 62° | 68° | 76° | 74° | 72° | 62–76° |
| 4d · 2026-09-22 | 63° | 71° | 72° | 73° | 70° | 61° | 74° | 61–74° |
| 3d · 2026-09-23 | 68° | 75° | 60° | 73° | 77° | 65° | 66° | 60–77° |
| 2d · 2026-09-24 | 64° | 67° | 66° | 67° | 61° | 64° | 76° | 61–76° |
| 1d · 2026-09-25 | 64° | 63° | 64° | 68° | 66° | 66° | 67° | 63–68° |
| 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 Philadelphia — 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 PHL 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.