> Sweet Potato wholesale price forecast for 19 series in Japan: 4- and 12-week ranges, typical error, and the months when sweet potato is cheapest. Updated daily.

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

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

# Sweet Potato price forecast for the next 12 weeks

19 wholesale sweet potato price series from 19 markets in Japan have a forecast. The median series points to little change over the coming weeks (−1.6% by the end of the forecast), against a typical 12-week error of 7%. Below: when sweet potato is usually cheapest and dearest in 2 countries.

[Sweet Potato prices today](https://husfarm.com/today-price/sweetpotato/)[Method](https://husfarm.com/forecasts/#method)

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

## Sweet Potato 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

### [Sweet potatoes](https://husfarm.com/prices/quotes/fukuoka-city-produce-market-vegfru-stadium/sweet-potatoes/)

🇯🇵 Fukuoka City Central Wholesale Market, Produce Market (Vegefru Stadium), Japan
Latest weekly average**268** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**233–324** most likely 277 · +3.3%
Week of 18 Jan 2027 +12 weeks**201–323** most likely 265 · −1.2%
Typical error in tests13.2% at 4 weeks, 13.6% at 12 weeks (“no change”: 9.4% and 23.4%)

### [Sweet potatoes](https://husfarm.com/prices/quotes/hiroshima-city-central-wholesale-market/sweet-potatoes/)

🇯🇵 Hiroshima City Central Wholesale Market, Japan
Latest weekly average**361** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**301–419** most likely 348 · −3.5%
Week of 18 Jan 2027 +12 weeks**288–472** most likely 367 · +1.7%
Typical error in tests6.3% at 4 weeks, 8.0% at 12 weeks (“no change”: 7.8% and 12.0%)

### [Sweet potatoes](https://husfarm.com/prices/quotes/kanazawa-city-central-wholesale-market/sweet-potatoes/)

🇯🇵 Kanazawa City Central Wholesale Market, Japan
Latest weekly average**362** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**331–407** most likely 355 · −2.0%
Week of 18 Jan 2027 +12 weeks**296–415** most likely 347 · −4.2%
Typical error in tests3.8% at 4 weeks, 7.1% at 12 weeks (“no change”: 5.5% and 14.9%)

### [Sweet potatoes](https://husfarm.com/prices/quotes/kitakyushu-city-central-wholesale-market/sweet-potatoes/)

🇯🇵 Kitakyushu City Central Wholesale Market, Japan
Latest weekly average**325** JPY/kg week of 26 Oct 2026
Week of 23 Nov 2026 +4 weeks**264–422** most likely 331 · +1.8%
Week of 18 Jan 2027 +12 weeks**234–422** most likely 317 · −2.5%
Typical error in tests7.8% at 4 weeks, 15.1% at 12 weeks (“no change”: 12.5% and 15.4%)

## All sweet potato 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.
Sweet Potato price forecasts by market, data of 13 Nov 2026
| Quote and market | Latest week | In 4 weeks | In 12 weeks | Change | Typical error |
| --- | --- | --- | --- | --- | --- |
| [Sweet potatoes](https://husfarm.com/prices/quotes/fukuoka-city-produce-market-vegfru-stadium/sweet-potatoes/)🇯🇵 Fukuoka City Central Wholesale Market, Produce Market (Vegefru Stadium)
| 268 JPY/kg | 233–324 | 201–323 | −1.2% | ±14% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/hiroshima-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Hiroshima City Central Wholesale Market
| 361 JPY/kg | 301–419 | 288–472 | +1.7% | ±8% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/kanazawa-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Kanazawa City Central Wholesale Market
| 362 JPY/kg | 331–407 | 296–415 | −4.2% | ±7% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/kitakyushu-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Kitakyushu City Central Wholesale Market
| 325 JPY/kg | 264–422 | 234–422 | −2.5% | ±15% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/kobe-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Kobe City Central Wholesale Market (Main Market)
| 309 JPY/kg | 292–329 | 286–343 | −0.6% | ±4% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/kyoto-central-wholesale-market/sweet-potatoes/)🇯🇵 Kyoto City Central Wholesale Market
| 319 JPY/kg | 307–369 | 273–355 | −1.4% | ±7% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-honjo/sweet-potatoes/)🇯🇵 Nagoya City Central Wholesale Market (Main Market)
| 318 JPY/kg | 299–342 | 282–345 | −2.0% | ±7% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/nagoya-city-central-wholesale-market-northern-market/sweet-potatoes/)🇯🇵 Nagoya City Central Wholesale Market (Northern Market)
| 325 JPY/kg | 307–366 | 297–373 | +2.7% | ±7% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/okinawa-prefectural-central-wholesale-market/sweet-potatoes/)🇯🇵 Okinawa Prefectural Central Wholesale Market
| 379 JPY/kg | 287–448 | 275–457 | −5.2% | ±14% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/osaka-city-central-wholesale-market-eastern-market/sweet-potatoes/)🇯🇵 Osaka City Central Wholesale Market (Eastern Market)
| 313 JPY/kg | 275–350 | 252–334 | −6.6% | ±7% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/osaka-city-central-wholesale-market-honjo/sweet-potatoes/)🇯🇵 Osaka City Central Wholesale Market (Main Market)
| 352 JPY/kg | 335–399 | 299–398 | −1.9% | ±5% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/ota-market/sweet-potatoes/)🇯🇵 Ota Market (Tokyo Metropolitan Central Wholesale Market)
| 324 JPY/kg | 302–358 | 290–366 | −1.6% | ±4% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/sapporo-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Sapporo City Central Wholesale Market
| 284 JPY/kg | 254–336 | 254–358 | +7.3% | ±10% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/sendai-city-central-wholesale-market-honjo/sweet-potatoes/)🇯🇵 Sendai City Central Wholesale Market (Main Market)
| 306 JPY/kg | 280–322 | 285–333 | +0.1% | ±5% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/takamatsu-city-central-wholesale-market/sweet-potatoes/)🇯🇵 Takamatsu City Central Wholesale Market
| 302 JPY/kg | 272–367 | 270–370 | +5.0% | ±5% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/toshima-market/sweet-potatoes/)🇯🇵 Toshima Market (Tokyo Metropolitan Central Wholesale Market)
| 340 JPY/kg | 298–391 | 265–411 | −5.4% | ±14% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/toyosu-market/sweet-potatoes/)🇯🇵 Toyosu Market (Tokyo Metropolitan Central Wholesale Market)
| 342 JPY/kg | 325–372 | 305–374 | −1.6% | ±6% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/yodobashi-market/sweet-potatoes/)🇯🇵 Yodobashi Market (Tokyo Metropolitan Central Wholesale Market)
| 331 JPY/kg | 295–350 | 286–352 | −3.6% | ±5% |
| [Sweet potatoes](https://husfarm.com/prices/quotes/yokohama-central-wholesale-market-honjo/sweet-potatoes/)🇯🇵 Yokohama City Central Wholesale Market (Main Market)
| 298 JPY/kg | 277–323 | 250–313 | −4.9% | ±7% |

## When is sweet potato cheapest? Seasonal price calendar

Usual wholesale price in each month against the yearly average, by country.
Sweet Potato 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 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 🇺🇾 Uruguay20 series · 2 markets · 2017–2025 | +61 | +8 | −7 | −14 | −22 | −20 | −15 | −10 | −2 | +4 | +21 | +43 | May | January |
| 🇯🇵 Japan19 series · 19 markets · 2024–2026 | −5 | −10 | −8 | −5 | +11 | +15 | +7 | +6 | −4 | +1 | −1 | −4 | February | June |

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 sweet potato prices go up or down in the coming weeks?Of 19 sweet potato price series with a forecast, 5 point higher and 14 lower or flat by the end of the forecast; the median series points to little change (−1.6%). The forecasts repeat what the season usually does and are recalculated daily (data of 13 Nov 2026).
When is sweet potato cheapest?In Uruguay, wholesale sweet potato prices are usually lowest in May (−21.7% against the yearly average) and highest in January (+60.8%), based on 20 price series from 2 markets, 2017–2025. The calendar on this page shows 1 more country.
How accurate is the sweet potato price forecast?In tests on the last 52 weeks of each series, the typical 12-week error of the published sweet potato forecasts was 7%. 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 sweet potato 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 Sweet Potato Index](https://husfarm.com/indices/sweetpotato-world/) · [Sweet Potato prices today](https://husfarm.com/today-price/sweetpotato/) · [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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