Was the forecast right for Boston on Sun Sep 27?
Boston, Massachusetts · daily high temperature in °F · forecasts from each model's archived runs, verified against the BOS observations
14 days out, 4 models put Boston's Sun Sep 27 high anywhere from 65° to 72°;by the final call, the day before, the field had settled to a median of 62°. The day verified at 60° against the BOS observations, with 1.5 in of precipitation — showers.
GFS landed closest, off by 0.6°. AIFS ran 2° warm.
What every model said, at every lead
Daily-high calls for Sun Sep 27 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 Boston scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-12 | — | 67° | — | — | 71° | — | — | 67–71° |
| 14d · 2026-09-13 | 65° | 68° | 72° | — | 70° | — | — | 65–72° |
| 13d · 2026-09-14 | 67° | 70° | 75° | — | 62° | — | — | 62–75° |
| 12d · 2026-09-15 | 65° | 81° | 72° | — | 75° | — | — | 65–81° |
| 11d · 2026-09-16 | 61° | 74° | 64° | — | 65° | — | — | 61–74° |
| 10d · 2026-09-17 | 60° | 64° | 60° | — | 58° | — | — | 58–64° |
| 9d · 2026-09-18 | 60° | 63° | 61° | 60° | 64° | — | — | 60–64° |
| 8d · 2026-09-19 | 60° | 61° | 68° | 56° | 57° | — | — | 56–68° |
| 7d · 2026-09-20 | 62° | 60° | 60° | 59° | 60° | — | — | 59–62° |
| 6d · 2026-09-21 | 64° | 58° | 60° | 59° | 64° | 59° | 59° | 58–64° |
| 5d · 2026-09-22 | 64° | 58° | 60° | 61° | 58° | 65° | 65° | 58–65° |
| 4d · 2026-09-23 | 62° | 57° | 64° | 58° | 56° | 61° | 60° | 56–64° |
| 3d · 2026-09-24 | 62° | 62° | 61° | 58° | 59° | 61° | 65° | 58–65° |
| 2d · 2026-09-25 | 62° | 60° | 63° | 62° | 58° | 61° | 62° | 58–63° |
| 1d · 2026-09-26 | 62° | 61° | 62° | 61° | 61° | 62° | 62° | 61–62° |
| actual | 60° |
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 Boston — 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 BOS 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.