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12 kn+. A kite day has at least 3 hours of 12 to 35 knots between 10:00 and 19:00. How we count.

Sea · Isumi · Japan

Onjuku

Best for kiting from February to April and from September to October, with 51 to 62 % kite days. Water 16 to 26 °C.

A kite day has at least 3 hours of 12 to 35 knots (gusts up to 45) between 10:00 and 19:00, in daylight. Percentages are the share of such days in each month, counted over 9 years.

  1. J49
  2. F51
  3. M58
  4. A62
  5. M48
  6. J39
  7. J48
  8. A42
  9. S52
  10. O57
  11. N43
  12. D38
Kite days by month at Onjuku: Jan 49 %, Feb 51 %, Mar 58 %, Apr 62 %, May 48 %, Jun 39 %, Jul 48 %, Aug 42 %, Sep 52 %, Oct 57 %, Nov 43 %, Dec 38 %
  • Prime 60 % and more
  • Good 40 to 59 %
  • Possible 20 to 39 %
  • Off under 20 %
  • No data hatched
  • Ringed: this month

Prime also needs a good month in at least 7 of the 9 years, so one freak year cannot make a month Prime. A month with 60 %+ but fewer good years shows as Good.

Confidence highHourly model data, 2017 to 2025, checked against the season shape of a nearby weather station, a regional model or a documented season.

See the best monthsLive forecastShow on map

Month by month

MonthKite days% of days, verdict10 day tripof 10 trips, 5+ kite daysWater°C, what to wear
  • Kite days
    57 % Goodabout 18 of 31 days
    Too light, kiteable, too strong
    • Too light 42 %
    • Kiteable 57 %
    • Too strong 1 %
    Good years
    2017: 77 % kite days2018: 52 % kite days2019: 55 % kite days2020: 61 % kite days2021: 52 % kite days2022: 65 % kite days2023: 36 % kite days2024: 71 % kite days2025: 48 % kite days7 of 9 years reached 50 % kite days
    10 day trip
    7 in 10 trips got at least 5 kite days, about 5.5 expected
    Best hours
    10:00 to 16:00when the wind is most often 12 to 35 knots
    Daylight
    11.3 h
    Water
    25 °C, spring suit
    Air
    22 °Cdaily maximum, 21 °C during kite hours
    Rain
    17 of 31with 1 mm or more
    In one sentence

    In October, Onjuku averaged 18 kite days out of 31 (57 %). Water 25 °C, spring suit. 7 in 10 trips of 10 days starting in October got at least 5 kite days.

Good year: at least half the days of that month were kite days. x in 10 reads: of all 10 day trips that started in that month between 2017 and 2025, x in 10 got at least 5 kite days. We cap the figure at 9 in 10 because wind is never a promise. Best hours: the hours from 10:00 on when the wind most often reaches 12 to 35 knots. Rain day: 1 mm or more of rain.

Source: ECMWF IFS 9 km via Open-Meteo, hourly model wind, 2017 to 2025; water temperature 2023 to 2025. How we count kite days and trip odds

Trip odds at Onjuku

How often a trip of your length got at least half its days with kite wind, 2017 to 2025, capped at 9 in 10.

  1. January6 in 10 trips of 10 days got at least 5 kite days, about 5.0 expected
  2. February7 in 10 trips of 10 days got at least 5 kite days, about 5.2 expected
  3. March8 in 10 trips of 10 days got at least 5 kite days, about 5.9 expected
  4. April9 in 10 trips of 10 days got at least 5 kite days, about 6.1 expected
  5. May5 in 10 trips of 10 days got at least 5 kite days, about 4.5 expected
  6. June5 in 10 trips of 10 days got at least 5 kite days, about 4.3 expected
  7. July5 in 10 trips of 10 days got at least 5 kite days, about 4.6 expected
  8. August5 in 10 trips of 10 days got at least 5 kite days, about 4.5 expected
  9. September6 in 10 trips of 10 days got at least 5 kite days, about 5.0 expected
  10. October (now)7 in 10 trips of 10 days got at least 5 kite days, about 5.5 expected
  11. November5 in 10 trips of 10 days got at least 5 kite days, about 4.4 expected
  12. December4 in 10 trips of 10 days got at least 5 kite days, about 3.9 expected

x in 10 reads: of all 10 day trips that started in that month between 2017 and 2025, x in 10 got at least 5 kite days. We cap the figure at 9 in 10 because wind is never a promise.

Open in the trip planner

Trip odds by start week

Pick your start week and trip length. Each cell: of all trips of that length that started in that week between 2017 and 2025, how many in 10 got at least half their days with kite wind.

Trip odds by start week, 10 day trips, 2017 to 2025

Colours as in the kite year: 6 in 10 and more like Prime · 4 to 5 in 10 like Good · 2 to 3 in 10 like Possible · under 2 in 10 like Off · No data hatched (fewer than 30 trips) · Ringed: this week · Raised: your start week

x in 10 reads: of all 10 day trips that started in that week between 2017 and 2025, x in 10 got at least 5 kite days. We cap the figure at 9 in 10 because wind is never a promise.

Source: hourly wind from the ECMWF IFS model via Open-Meteo, 2017 to 2025, kiteCOMPASS method v1. How we count

Trip odds by start week in Onjuku: W1 7 in 10, W2 6 in 10, W3 7 in 10, W4 6 in 10, W5 7 in 10, W6 8 in 10, W7 6 in 10, W8 6 in 10, W9 8 in 10, W10 8 in 10, W11 8 in 10, W12 9 in 10, W13 9 in 10, W14 9 in 10, W15 9 in 10, W16 9 in 10, W17 8 in 10, W18 7 in 10, W19 5 in 10, W20 4 in 10, W21 4 in 10, W22 3 in 10, W23 6 in 10, W24 3 in 10, W25 5 in 10, W26 6 in 10, W27 7 in 10, W28 5 in 10, W29 5 in 10, W30 4 in 10, W31 5 in 10, W32 6 in 10, W33 3 in 10, W34 4 in 10, W35 7 in 10, W36 4 in 10, W37 7 in 10, W38 8 in 10, W39 5 in 10, W40 8 in 10, W41 9 in 10, W42 8 in 10, W43 4 in 10, W44 4 in 10, W45 6 in 10, W46 6 in 10, W47 5 in 10, W48 3 in 10, W49 5 in 10, W50 4 in 10, W51 3 in 10, W52 3 in 10

6 in 10

trips of 10 days starting in week 45 (e.g. 5 to 11 November) got at least 5 kite days in 2017 to 2025 (63 trips).

Zero wind trips: fewer than 1 in 20

about 4.6 kite days expected out of 10

Kite days per trip, 63 trips

Bars right of the line are good trips (5 kite days or more).

How the wind behaves

In April, the windiest month

  • Too light 38 %
  • Kiteable 62 %
  • Too strong 0 %

Too light on 38 %, kiteable on 62 %, too strong on 0 % of days.

Best hours: 10:00 to 17:00, when the wind is most often 12 to 35 knots.

NESW

Share of kite days by wind direction, 16 sectors

Wind direction varies, most often SW (225°).

Kitesurfing at Onjuku: quick answers

When is the best time to kitesurf at Onjuku?

The best months are February to April and September to October: from 2017 to 2025, 51 to 62 % of days in those months were kite days.

Is Onjuku windy in October?

Yes, often. 57 % of days in October were kite days from 2017 to 2025, about 18 days in a typical October. 7 in 10 trips of 10 days starting in October got at least 5 kite days, 2017 to 2025.

What is the water temperature at Onjuku?

The water ranges from 16 °C in March to 26 °C in August. In October it is about 25 °C (wetsuit: spring suit).

How many kite days does Onjuku get in a year?

About 179 days a year were kite days from 2017 to 2025, out of 365. A kite day has at least 3 hours of 12 to 35 kn model wind between 10:00 and 19:00 in daylight, with gusts up to 45 kn.

Live forecast

The numbers above are long term averages. The forecast shows the next days.

Live forecast from Windy

The forecast map for Onjuku comes from windy.com (Windyty SE, Prague, Czech Republic) and opens right here on this page. Once you load it, your browser contacts Windy, which receives your IP address and may set its own cookies. Nothing is loaded before you click.

Spot facts

Region
Isumi
Country
Japan
Water body
Sea, from Natural Earth map data
Nearest airport
Narita International Airport (NRT), 65 km straight line. Flights are not sold here; this is for planning only.
Time zone
UTC+09:00 in October
Coordinates
35.1822, 140.3560
Model
ECMWF IFS 9 km via Open-Meteo, hourly
Satellite view of Onjuku

Conditions, checked against kite guides

Water state, flat areas, waves and whether schools teach here, from kite sources, not from satellite images.

Not yet checked against kite guides. We research spot conditions one by one and show only what a kite source says.

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Booking reminder

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One mail, about 8 weeks before your month starts, with the kite day odds for that month and the link to this page. No newsletter.

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kiteCOMPASS · method k3h-10to19-v1 · 2017 to 2025

Model wind: ECMWF IFS 9 km via Open-Meteo, hourly, 2017 to 2025. Water temperature: 2023 to 2025. Kite day: at least 3 hours of 12 to 35 kn model wind between 10:00 and 19:00 in daylight, with gusts up to 45 kn. Confidence: high.

Cite this

In October, 57 % of days at Onjuku met the kiteCOMPASS kite day rule: at least 3 hours of 12 to 35 kn model wind between 10:00 and 19:00 in daylight, with gusts up to 45 kn (ECMWF IFS 9 km via Open-Meteo, hourly, 2017 to 2025). https://kitecompass.app/spot/onjuku

Numbers on this page are free to reuse under CC BY 4.0: name kiteCOMPASS and link to this page.