10 wholesale yam price series from 10 markets in Japan have a forecast. The median series points to a fall over the coming weeks (−5.8% by the end of the forecast), against a typical 12-week error of 6%. Below: when yam is usually cheapest and dearest in 1 country.
🇯🇵 Kobe City Central Wholesale Market (Main Market), Japan
🇯🇵 Nagoya City Central Wholesale Market (Main Market), Japan
🇯🇵 Nagoya City Central Wholesale Market (Northern Market), Japan
🇯🇵 Osaka City Central Wholesale Market (Eastern Market), Japan
Prices in each market’s currency and unit. Range: 80%. Typical error: median error at 12 weeks in the test on the series’ own history.
| Quote and market | Latest week | In 4 weeks | In 12 weeks | Change | Typical error |
|---|---|---|---|---|---|
| Japanese yams (yamanoimo) 🇯🇵 Kobe City Central Wholesale Market (Main Market) | 510 JPY/kg | 439–610 | 355–536 | −11.2% | ±11% |
| Japanese yams (yamanoimo) 🇯🇵 Nagoya City Central Wholesale Market (Main Market) | 452 JPY/kg | 420–469 | 347–445 | −5.9% | ±3% |
| Japanese yams (yamanoimo) 🇯🇵 Nagoya City Central Wholesale Market (Northern Market) | 456 JPY/kg | 426–484 | 354–478 | −3.8% | ±6% |
| Japanese yams (yamanoimo) 🇯🇵 Osaka City Central Wholesale Market (Eastern Market) | 563 JPY/kg | 454–669 | 385–621 | −10.3% | ±12% |
| Japanese yams (yamanoimo) 🇯🇵 Ota Market (Tokyo Metropolitan Central Wholesale Market) | 478 JPY/kg | 425–487 | 386–493 | −4.1% | ±5% |
| Japanese yams (yamanoimo) 🇯🇵 Sapporo City Central Wholesale Market | 390 JPY/kg | 307–461 | 275–447 | −4.3% | ±12% |
| Japanese yams (yamanoimo) 🇯🇵 Sendai City Central Wholesale Market (Main Market) | 530 JPY/kg | 433–604 | 379–537 | −13.2% | ±11% |
| Japanese yams (yamanoimo) 🇯🇵 Takamatsu City Central Wholesale Market | 521 JPY/kg | 476–576 | 397–541 | −5.8% | ±5% |
| Japanese yams (yamanoimo) 🇯🇵 Toshima Market (Tokyo Metropolitan Central Wholesale Market) | 448 JPY/kg | 408–480 | 359–467 | −5.7% | ±6% |
| Japanese yams (yamanoimo) 🇯🇵 Toyosu Market (Tokyo Metropolitan Central Wholesale Market) | 523 JPY/kg | 498–597 | 434–553 | −2.8% | ±7% |
Usual wholesale price in each month against the yearly average, by country.
| Country | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Cheapest | Dearest |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 🇯🇵 Japan19 series · 19 markets · 2024–2026 | −1 | −6 | −7 | −5 | −3 | −4 | −2 | +6 | +10 | +10 | +9 | +5 | March | September |
cheaper than the yearly average · dearer · figures in % · no quotes in that month (season or data gap). Monthly averages of each series against its yearly average, after removing the long-term trend such as inflation; median across series and markets of the country, years with at least 10 months of quotes.
The forecasts extend each series’ own seasonal pattern; they do not know about this year’s weather, harvests, policy or currency moves. Use the range, not only the central figure, and do not base trading, purchasing or credit decisions on them alone.
Of 10 yam price series with a forecast, 0 point higher and 10 lower or flat by the end of the forecast; the median series points to a fall (−5.8%). The forecasts repeat what the season usually does and are recalculated daily (data of 13 Nov 2026).
In Japan, wholesale yam prices are usually lowest in March (−6.5% against the yearly average) and highest in September (+9.7%), based on 19 price series from 19 markets, 2024–2026.
In tests on the last 52 weeks of each series, the typical 12-week error of the published yam forecasts was 6%. Each series passed the test only because its errors were smaller than those of a “no change” forecast. Results of the archived forecasts are on the accuracy page.
From the wholesale markets and price services listed on each series, as published, in their own currencies and units. Husfarm does not adjust them except to compute weekly and monthly averages.
Husfarm Yam Index · Yam prices today · All price forecasts · Accuracy
Calculated from Husfarm price data; changes with every update. Data licensed under CC BY 4.0.
