Joliet, IL — every free forecast we can get, averaged to be a little more right. County seat of Will County.
Updated Friday, November 13, 2026. Recorded fresh this morning from five free sources, and graded later against what the weather actually did.
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High 45° Low 35° Rain 37%
They disagree — a coin flip (highs spread 1°, rain spread 62 points, 3 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | — | 33° | 41% |
| US model (GFS) | 45° | 36° | 5% |
| European model (ECMWF) | 44° | 37° | 35% |
| Canadian model (GEM) | 45° | 35° | 67% |
| The average | 45° | 35° | 37% |
High 43° Low 32° Rain 25%
Pretty close — fairly safe (highs spread 3°, rain spread 30 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 43° | 30° | 43% |
| US model (GFS) | 41° | 32° | 13% |
| European model (ECMWF) | 43° | 34° | 14% |
| Canadian model (GEM) | 44° | 32° | 29% |
| The average | 43° | 32° | 25% |
High 45° Low 28° Rain 3%
They agree — trust it (highs spread 1°, rain spread 10 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 46° | 28° | 0% |
| US model (GFS) | 46° | 31° | 2% |
| European model (ECMWF) | 45° | 31° | 0% |
| Canadian model (GEM) | 45° | 23° | 10% |
| The average | 45° | 28° | 3% |
High 48° Low 28° Rain 0%
They agree — trust it (highs spread 2°, rain spread 0 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 49° | 28° | 0% |
| US model (GFS) | 48° | 34° | 0% |
| European model (ECMWF) | 47° | 29° | 0% |
| Canadian model (GEM) | 49° | 20° | 0% |
| The average | 48° | 28° | 0% |
Scoring has started — every forecast is being recorded. The first grades land once the historical record publishes what actually happened (it runs a few days behind), and this board fills in from there.