Prosser, WA — every free forecast we can get, averaged to be a little more right. County seat of Benton County.
Updated Friday, November 13, 2026. Recorded fresh this morning from five free sources, and graded later against what the weather actually did.
← All cities and the scoreboard
High 52° Low 42° Rain 3%
They agree — trust it (highs spread 2°, rain spread 10 points, 3 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | — | 36° | 3% |
| US model (GFS) | 51° | 46° | 0% |
| German model (ICON) | 53° | 42° | 0% |
| Canadian model (GEM) | 52° | 43° | 10% |
| The average | 52° | 42° | 3% |
High 58° Low 42° Rain 52%
They disagree — a coin flip (highs spread 8°, rain spread 65 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 61° | 38° | 67% |
| US model (GFS) | 58° | 45° | 48% |
| German model (ICON) | 58° | 42° | 80% |
| Canadian model (GEM) | 53° | 42° | 15% |
| The average | 58° | 42° | 52% |
High 60° Low 42° Rain 29%
They disagree — a coin flip (highs spread 3°, rain spread 68 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 62° | 38° | 68% |
| US model (GFS) | 59° | 44° | 44% |
| German model (ICON) | 60° | 46° | 5% |
| Canadian model (GEM) | 61° | 41° | 0% |
| The average | 60° | 42° | 29% |
High 57° Low 42° Rain 68%
Pretty close — fairly safe (highs spread 3°, rain spread 8 points, 4 sources)
| Source | High | Low | Rain |
|---|---|---|---|
| National Weather Service | 56° | 36° | 68% |
| US model (GFS) | 56° | 48° | 65% |
| German model (ICON) | 57° | 47° | 73% |
| Canadian model (GEM) | 59° | 38° | 65% |
| The average | 57° | 42° | 68% |
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.