Overview

Isumi is a kitesurfing spot on the east coast of the Boso Peninsula, Chiba Prefecture. This coastal area offers Pacific exposure with wave conditions and southwest winds in summer and northeast winds in winter.

The water is oceanic. Tides are significant. Suited for intermediate riders.

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Spot forecast for Isumi

Sunrise 05:48 · Sunset 16:57

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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

Swell and waves

Swell and tides over 8 days. Premium members see the swell and tides over 8 days. Without a subscription: 5 days.

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Wave height: < 0.5 m 0.5–1 m 1–2 m 2–3 m ≥ 3 m

Swell data by Open-Meteo Marine

Tides

Heights above lowest astronomical tide, in the spot's local time. Computed 3.7 km from the spot.

Tuesday 20 October Low tide 05:19 · 0.6 m High tide 13:46 · 1.3 m Low tide 19:13 · 1.1 m High tide 22:50 · 1.1 m
Wednesday 21 October Low tide 06:31 · 0.6 m High tide 14:04 · 1.3 m Low tide 19:48 · 1 m
Thursday 22 October High tide 00:53 · 1.2 m Low tide 07:24 · 0.6 m High tide 14:21 · 1.4 m Low tide 20:17 · 0.8 m
Friday 23 October High tide 02:02 · 1.3 m Low tide 08:07 · 0.6 m High tide 14:38 · 1.4 m Low tide 20:46 · 0.6 m
Saturday 24 October High tide 02:54 · 1.4 m Low tide 08:47 · 0.7 m High tide 14:57 · 1.4 m Low tide 21:16 · 0.5 m

Isumi: 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

175h

in May · 17.5 rideable days

Wind is uneven from month to month: the best months are October, May and March, at 18 rideable days and 19 °C. The low point is June, at 6.5 days.

Rideable days per month

Wind strength when it is rideable

7-12 knots · 95%13-20 knots · 5%

When the spot works, wind sits mostly between 7 and 12 knots — 95% of rideable hours. Big-kite territory. The coldest month is January, at 11 °C. The wettest month is May, with 302 mm.

Monthly averages: Isumi

Monthly averages — Isumi — averaged over 2 years of records — Weather data by Open-Meteo.com — How it is calculated
Month	Rideable days	Usable wind	Temperature	Rain
January	9.0	51 h	11 °C	58 mm
February	11.5	84 h	11 °C	104 mm
March	16.5	119 h	14 °C	289 mm
April	12.5	106 h	18 °C	188 mm
May	17.5	175 h	21 °C	302 mm
June	6.5	55 h	25 °C	292 mm
July	9.5	84 h	30 °C	187 mm
August	10.0	84 h	30 °C	275 mm
September	13.5	115 h	28 °C	238 mm
October	19.5	189 h	22 °C	227 mm
November	13.0	102 h	18 °C	120 mm
December	7.5	50 h	13 °C	77 mm

Photo gallery of Isumi

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Technical details of Isumi spot

The spot works with winds from N, NNE, NE, S, SSW, SW.

Rideable Not rideable

Spot opening date · Required level

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

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Ogimet - Katsuura (Japan)14.5 kmsource ogimet

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Webcams near Isumi

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Nearby spots

All spots: Préfecture de Chiba

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Isumi kitesurf, wingfoil and surf spot