> Yam wholesale price forecast for 10 series in Japan: 4- and 12-week ranges, typical error, and the months when yam is cheapest. Updated daily.

Source: https://husfarm.com/forecasts/yams/

[Home](https://husfarm.com/)›[Prices](https://husfarm.com/prices/)›[Price forecasts](https://husfarm.com/forecasts/)›YamPrice forecast · data of 13 Nov 2026

# Yam price forecast for the next 12 weeks

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.

[Yam prices today](https://husfarm.com/today-price/yams/)[Method](https://husfarm.com/forecasts/#method)

[Forecasts](#forecasts)[All series](#all)[Seasonal calendar](#seasons)[Questions](#questions)

## Yam forecasts: 4 markets with the longest test record

Weekly average priceMost likely path80% range: 8 in 10 past forecasts ended inside a range this wide

### [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/kobe-city-central-wholesale-market/japanese-yams/)

🇯🇵 Kobe City Central Wholesale Market (Main Market), Japan
Latest weekly average**510** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**439–610** most likely 516 · +1.2%
Week of 18 Jan 2027 +12 weeks**355–536** most likely 453 · −11.2%
Typical error in tests11.2% at 4 weeks, 11.3% at 12 weeks (“no change”: 10.6% and 16.8%)

### [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-honjo/japanese-yams/)

🇯🇵 Nagoya City Central Wholesale Market (Main Market), Japan
Latest weekly average**452** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**420–469** most likely 449 · −0.6%
Week of 18 Jan 2027 +12 weeks**347–445** most likely 425 · −5.9%
Typical error in tests2.9% at 4 weeks, 3.4% at 12 weeks (“no change”: 2.6% and 6.7%)

### [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-northern-market/japanese-yams/)

🇯🇵 Nagoya City Central Wholesale Market (Northern Market), Japan
Latest weekly average**456** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**426–484** most likely 456 · ±0.0%
Week of 18 Jan 2027 +12 weeks**354–478** most likely 439 · −3.8%
Typical error in tests3.0% at 4 weeks, 5.6% at 12 weeks (“no change”: 2.2% and 7.1%)

### [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/osaka-city-central-wholesale-market-eastern-market/japanese-yams/)

🇯🇵 Osaka City Central Wholesale Market (Eastern Market), Japan
Latest weekly average**563** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**454–669** most likely 551 · −2.1%
Week of 18 Jan 2027 +12 weeks**385–621** most likely 505 · −10.3%
Typical error in tests6.6% at 4 weeks, 11.6% at 12 weeks (“no change”: 7.3% and 14.1%)

## All yam forecasts

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.
Yam price forecasts by market, data of 13 Nov 2026
| Quote and market | Latest week | In 4 weeks | In 12 weeks | Change | Typical error |
| --- | --- | --- | --- | --- | --- |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/kobe-city-central-wholesale-market/japanese-yams/)🇯🇵 Kobe City Central Wholesale Market (Main Market)
| 510 JPY/kg | 439–610 | 355–536 | −11.2% | ±11% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-honjo/japanese-yams/)🇯🇵 Nagoya City Central Wholesale Market (Main Market)
| 452 JPY/kg | 420–469 | 347–445 | −5.9% | ±3% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-northern-market/japanese-yams/)🇯🇵 Nagoya City Central Wholesale Market (Northern Market)
| 456 JPY/kg | 426–484 | 354–478 | −3.8% | ±6% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/osaka-city-central-wholesale-market-eastern-market/japanese-yams/)🇯🇵 Osaka City Central Wholesale Market (Eastern Market)
| 563 JPY/kg | 454–669 | 385–621 | −10.3% | ±12% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/ota-market/japanese-yams/)🇯🇵 Ota Market (Tokyo Metropolitan Central Wholesale Market)
| 478 JPY/kg | 425–487 | 386–493 | −4.1% | ±5% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/sapporo-city-central-wholesale-market/japanese-yams/)🇯🇵 Sapporo City Central Wholesale Market
| 390 JPY/kg | 307–461 | 275–447 | −4.3% | ±12% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/sendai-city-central-wholesale-market-honjo/japanese-yams/)🇯🇵 Sendai City Central Wholesale Market (Main Market)
| 530 JPY/kg | 433–604 | 379–537 | −13.2% | ±11% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/takamatsu-city-central-wholesale-market/japanese-yams/)🇯🇵 Takamatsu City Central Wholesale Market
| 521 JPY/kg | 476–576 | 397–541 | −5.8% | ±5% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/toshima-market/japanese-yams/)🇯🇵 Toshima Market (Tokyo Metropolitan Central Wholesale Market)
| 448 JPY/kg | 408–480 | 359–467 | −5.7% | ±6% |
| [Japanese yams (yamanoimo)](https://husfarm.com/prices/quotes/toyosu-market/japanese-yams/)🇯🇵 Toyosu Market (Tokyo Metropolitan Central Wholesale Market)
| 523 JPY/kg | 498–597 | 434–553 | −2.8% | ±7% |

## When is yam cheapest? Seasonal price calendar

Usual wholesale price in each month against the yearly average, by country.
Yam wholesale prices by month, percent above or below the yearly average
| 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.

### A statistical forecast, not advice

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.

## Questions and answers

Will yam prices go up or down in the coming weeks?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).
When is yam cheapest?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.
How accurate is the yam price forecast?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.
Where do the yam prices come from?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](https://husfarm.com/indices/yams-world/) · [Yam prices today](https://husfarm.com/today-price/yams/) · [All price forecasts](https://husfarm.com/forecasts/) · [Accuracy](https://husfarm.com/forecasts/accuracy/)
Calculated from Husfarm price data; changes with every update. Data licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).

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