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.
🇯🇵 Fukuoka City Central Wholesale Market, Produce Market (Vegefru Stadium), Japan
🇯🇵 Hiroshima City Central Wholesale Market, Japan
🇯🇵 Kanazawa City Central Wholesale Market, Japan
🇯🇵 Kitakyushu City Central Wholesale 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 |
|---|---|---|---|---|---|
| Sweet potatoes 🇯🇵 Fukuoka City Central Wholesale Market, Produce Market (Vegefru Stadium) | 268 JPY/kg | 233–324 | 201–323 | −1.2% | ±14% |
| Sweet potatoes 🇯🇵 Hiroshima City Central Wholesale Market | 361 JPY/kg | 301–419 | 288–472 | +1.7% | ±8% |
| Sweet potatoes 🇯🇵 Kanazawa City Central Wholesale Market | 362 JPY/kg | 331–407 | 296–415 | −4.2% | ±7% |
| Sweet potatoes 🇯🇵 Kitakyushu City Central Wholesale Market | 325 JPY/kg | 264–422 | 234–422 | −2.5% | ±15% |
| Sweet potatoes 🇯🇵 Kobe City Central Wholesale Market (Main Market) | 309 JPY/kg | 292–329 | 286–343 | −0.6% | ±4% |
| Sweet potatoes 🇯🇵 Kyoto City Central Wholesale Market | 319 JPY/kg | 307–369 | 273–355 | −1.4% | ±7% |
| Sweet potatoes 🇯🇵 Nagoya City Central Wholesale Market (Main Market) | 318 JPY/kg | 299–342 | 282–345 | −2.0% | ±7% |
| Sweet potatoes 🇯🇵 Nagoya City Central Wholesale Market (Northern Market) | 325 JPY/kg | 307–366 | 297–373 | +2.7% | ±7% |
| Sweet potatoes 🇯🇵 Okinawa Prefectural Central Wholesale Market | 379 JPY/kg | 287–448 | 275–457 | −5.2% | ±14% |
| Sweet potatoes 🇯🇵 Osaka City Central Wholesale Market (Eastern Market) | 313 JPY/kg | 275–350 | 252–334 | −6.6% | ±7% |
| Sweet potatoes 🇯🇵 Osaka City Central Wholesale Market (Main Market) | 352 JPY/kg | 335–399 | 299–398 | −1.9% | ±5% |
| Sweet potatoes 🇯🇵 Ota Market (Tokyo Metropolitan Central Wholesale Market) | 324 JPY/kg | 302–358 | 290–366 | −1.6% | ±4% |
| Sweet potatoes 🇯🇵 Sapporo City Central Wholesale Market | 284 JPY/kg | 254–336 | 254–358 | +7.3% | ±10% |
| Sweet potatoes 🇯🇵 Sendai City Central Wholesale Market (Main Market) | 306 JPY/kg | 280–322 | 285–333 | +0.1% | ±5% |
| Sweet potatoes 🇯🇵 Takamatsu City Central Wholesale Market | 302 JPY/kg | 272–367 | 270–370 | +5.0% | ±5% |
| Sweet potatoes 🇯🇵 Toshima Market (Tokyo Metropolitan Central Wholesale Market) | 340 JPY/kg | 298–391 | 265–411 | −5.4% | ±14% |
| Sweet potatoes 🇯🇵 Toyosu Market (Tokyo Metropolitan Central Wholesale Market) | 342 JPY/kg | 325–372 | 305–374 | −1.6% | ±6% |
| Sweet potatoes 🇯🇵 Yodobashi Market (Tokyo Metropolitan Central Wholesale Market) | 331 JPY/kg | 295–350 | 286–352 | −3.6% | ±5% |
| Sweet potatoes 🇯🇵 Yokohama City Central Wholesale Market (Main Market) | 298 JPY/kg | 277–323 | 250–313 | −4.9% | ±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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 🇺🇾 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.
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 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).
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.
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.
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 · Sweet Potato prices today · All price forecasts · Accuracy
Calculated from Husfarm price data; changes with every update. Data licensed under CC BY 4.0.
