Overview

Akaiwatosen is a freshwater kitesurfing spot located on the banks of the Tone River in Gunma Prefecture, north of Tokyo. This river spot offers a flat body of water ideal for learning and freestyle, in a rural setting surrounded by rice paddies and mountains. The dominant wind comes from the northwest in winter, channelled through the Tone River valley from the Gunma mountains. In summer, southeast thermal breezes travel up the valley in the late afternoon. The river body of water is flat and shallow, perfect for beginners. This freshwater spot is not affected by tides. Access is via the riverbanks with parking available. Be aware that water levels can vary depending on rainfall and upstream dam releases.

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Spot forecast for Akaiwatosen River Tone

Sunrise 05:53 · Sunset 17:00

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< 7 kn7–12 kn13–20 kn21–30 kn31–40 kn41+ kn Gusts Your minimum: 7 kn

Forecasts provided by Open-Meteo

Akaiwatosen River Tone: when to go?

Rideable days and hours computed for a minimum wind of 7 knots · log in to set your own (foil, twin-tip…)

Season · peak

133h

in January · 16 rideable days

The season runs from November to April, peaking in January: 14 rideable days a month and 133 hours of usable wind, at 13 °C. The low point is August, at 3 days.

Rideable days per month

Wind strength when it is rideable

7-12 knots · 85%13-20 knots · 15%

When the spot works, wind sits mostly between 7 and 12 knots — 85% of rideable hours. Big-kite territory. The coldest month is January, at 9 °C. The wettest month is May, with 202 mm.

Monthly averages: Akaiwatosen River Tone

Monthly averages — Akaiwatosen River Tone — averaged over 2 years of records — Weather data by Open-Meteo.com — How it is calculated
Month	Rideable days	Usable wind	Temperature	Rain
January	16.0	133 h	9 °C	25 mm
February	15.0	136 h	10 °C	45 mm
March	15.5	131 h	13 °C	144 mm
April	11.5	77 h	20 °C	116 mm
May	8.5	62 h	24 °C	202 mm
June	5.5	20 h	29 °C	175 mm
July	5.0	36 h	33 °C	78 mm
August	3.0	19 h	34 °C	125 mm
September	3.0	19 h	30 °C	119 mm
October	4.0	21 h	22 °C	121 mm
November	9.5	78 h	16 °C	35 mm
December	14.0	104 h	11 °C	18 mm

Photo gallery of Akaiwatosen River Tone

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Technical details of Akaiwatosen River Tone spot

The spot works with winds from SE, W, WNW, NW.

Depending on conditions: N, ESE, SSE, S, WSW, NNW.

RideableDepending on conditions Not rideable

Spot opening date · Required level

Spot opening date: Open all year round
Required level: Beginner

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Ogimet - Kumagaya (Japan)7.8 kmsource ogimet

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Akaiwatosen River Tone kitesurf and wingfoil spot