Where the weather models disagree in Washington
Washington, Reagan National station · daily high temperature in °C · the next 14 days · using data from 2026-10-18T12:50 UTC
The models are furthest apart on Sat Oct 31, where 4 of them put Washington's high anywhere from 13° to 24° — ECMWF coldest, GFS hottest. That spread is greater than typical for forecasts with a 13-day lead at this location.
Watch a date in Washington and see what each new model run does to it, with the full forecast beside it. Request an invite; it's free during the beta.
The band, day by day
The shaded band is the lowest to the highest model high each day; the line is the median model. The band pales as models drop out with lead — 4 to 7 models across these days — so a narrower far end is fewer opinions, not more agreement.
Every day, every model
highs in °C · typical spread is the median spread for that lead over the last month here
How this page is built
The models are the independent global centres Open-Meteo serves for this point — GFS, ECMWF IFS, ICON, GEM, UKMO and the AIFS and AIGFS AI models — as The Spread recorded them at its last sweep. NBM and every other blend are left out: a consensus product hides the disagreement this page exists to show.
Each model publishes to a different horizon, which is why Models is counted per day rather than once. Beyond day 14 only two models remain and both are NOAA's, so the page stops there. Range is the lowest to the highest model high; Spread is the highest model high minus the lowest.
Typical spread is the median spread for that lead over the last month here, and needs ten days of forecasts at that lead before it is shown. It is there because a wide band ten days out is ordinary and the same band tomorrow is not — so nothing on this page is called a divergence; the comparison is against what this lead usually looks like at this location.
GEFS p10–p90 is one centre's ensemble, shown beside the band and never as it: it verifies a few degrees warm at every lead.
| Day | Models | Range | Spread | Typical spread | Coldest | Hottest | GEFS p10–p90 |
|---|---|---|---|---|---|---|---|
| Sun Oct 18 | 7 | 15° to 17° | 2° | 2° | AIGFS 15° | GFS 17° | 14° to 17° |
| Mon Oct 19 | 7 | 18° to 19° | 1° | 2° | AIGFS 18° | UKMO 19° | 16° to 19° |
| Tue Oct 20 | 7 | 19° to 22° | 3° | 3° | GEM 19° | AIFS 22° | 18° to 21° |
| Wed Oct 21 | 7 | 17° to 19° | 2° | 4° | GEM 17° | GFS 19° | 16° to 19° |
| Thu Oct 22 | 7 | 17° to 21° | 4° | 4° | GEM 17° | AIFS 21° | 17° to 19° |
| Fri Oct 23 | 7 | 14° to 18° | 4° | 5° | ECMWF 14° | UKMO 18° | 14° to 19° |
| Sat Oct 24 | 6 | 13° to 17° | 4° | 5° | ECMWF 13° | AIFS 17° | 12° to 17° |
| Sun Oct 25 | 5 | 16° to 19° | 3° | 6° | ECMWF 16° | AIFS 19° | 14° to 18° |
| Mon Oct 26 | 5 | 18° to 23° | 5° | 6° | GEM 18° | AIFS 23° | 14° to 21° |
| Tue Oct 27 | 4 | 18° to 21° | 3° | 6° | AIFS 18° | AIGFS 21° | 15° to 21° |
| Wed Oct 28 | 4 | 14° to 20° | 6° | 6° | ECMWF 14° | GFS 20° | 13° to 21° |
| Thu Oct 29 | 4 | 14° to 19° | 5° | 7° | ECMWF 14° | AIFS 19° | 12° to 21° |
| Fri Oct 30 | 4 | 17° to 25° | 8° | 6° | AIGFS 17° | GFS 25° | 12° to 21° |
| Sat Oct 31 | 4 | 13° to 24° | 11° | 8° | ECMWF 13° | GFS 24° | 14° to 22° |
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