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Surf Forecasts:
Onjuku surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 pm Sunday 31 May 2026 JSTForecast update in hr min s Forecast update imminent
Onjuku surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Onjuku sea temperature is
22.2° C
(Which is slightly warmer than usual)How big are the waves at Onjuku today (31 May):
- Afternoon surf: Afternoon surf (31 May, local time) - 2.5ft (0.7m), 10s period with ESE swell.
- Evening surf: Evening surf (31 May, local time) - 2.5ft (0.8m), 12s period with S swell.
The current surf forecast for Onjuku at 7PM is: 0.9m 10s primary swell from a East-southeast direction and 0.7m 12s secondary swell from a South direction, 0.5m 3s secondary swell from a South direction (forecast issued at 02:00pm May 31). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | - | - |
| Afternoon (31 May) | 2.5ft (0.7m) | 10s |
| Evening (31 May) | 2.5ft (0.8m) | 12s |
Table - waves today at Onjuku. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 38mm), heaviest during Wed morning. Warm (max 23°C on Sun afternoon, min 18°C on Wed morning). Winds increasing (light winds from the S on Mon night, strong winds from the ESE by Wed morning). | ||||||||||||||||||||||||
Sun 31 | Monday 1 | Tuesday 2 | Wed 3 | |||||||||||||||||||||
12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ESE 10 | ESE 10 | ESE 10 | S 12 | S 11 | S 11 | S 11 | S 11 | S 11 | S 11 | SSW 14 | SSW 14 | SSW 13 | S 13 | S 13 | S 12 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSE 6 | SE 7 | |
131 | 104 | 175 | 180 | 163 | 154 | 151 | 151 | 112 | 108 | 120 | 147 | 184 | 276 | 209 | 184 | 361 | 317 | 246 | 242 | 175 | 167 | 260 | 618 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on | on | on | on | cross-on | cross | |
High Tide | 5:34PM1.29m | 3:36AM1.41m | 6:10PM1.28m | 4:08AM1.41m | 6:47PM1.27m | 4:42AM1.41m | ||||||||||||||||||
Low Tide | 10:23AM0.12m | 10:19PM0.96m | 10:57AM0.10m | 10:51PM0.97m | 11:32AM0.11m | 11:23PM0.97m | ||||||||||||||||||
 |  | |  | | |  | | | | | |  | | | | | | | | |  |  |  | |
 | — | — | — | — | — | 4:24 | — | — | — | — | — | — | — | 4:24 | — | — | — | — | — | — | — | 4:24 | — | — |
 | — | — | 6:45 | — | — | — | — | — | — | — | 6:46 | — | — | — | — | — | — | — | 6:46 | — | — | — | — | 6:47 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 11 | |
Temp °C | 23 | 23 | 23 | 21 | 20 | 19 | 19 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 21 | 21 | 20 | 19 | 18 |
24 | 23 | 22 | 18 | 17 | 18 | 18 | 21 | 20 | 19 | 19 | 19 | 20 | 20 | 20 | 19 | 19 | 19 | 21 | 20 | 20 | 19 | 16 | 12 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | S 12 | S 11 | S 11 | S 11 | S 11 | S 11 | S 11 | S 10 | SSW 14 | S 10 | S 13 | S 13 | S 12 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 13 |
 kJ | 131 | 104 | 175 | 180 | 163 | 154 | 151 | 151 | 112 | 108 | 98 | 147 | 125 | 276 | 209 | 184 | 361 | 317 | 246 | 242 | 175 | 167 | 85 | 64 |
Swell 2 Height (m) Direction Period (s) | S 6 | S 12 | S 12 | ESE 10 | ESE 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | S 10 | SSW 13 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | SW 15 | SW 15 |
| kJ | 10 | 74 | 144 | 102 | 102 | 94 | 68 | 67 | 63 | 61 | 64 | 70 | 184 | 63 | 63 | 63 | 61 | 61 | 60 | 42 | 42 | 42 | 58 | 79 |
Swell 3 Height (m) Direction Period (s) | S 14 | S 15 | SE 12 | SE 12 | SSE 12 | S 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | E 9 | E 10 | SW 17 | SSW 16 | SSW 15 | SE 12 | SE 12 | SE 12 | SE 12 | SE 12 | SE 11 | — | — |
| kJ | 60 | 17 | 23 | 23 | 15 | 6 | 28 | 53 | 84 | 78 | 120 | 64 | 65 | 73 | 99 | 148 | 35 | 21 | 21 | 21 | 21 | 20 | — | — |
Wind waves Height (m) Direction Period (s) | S 6 | S 6 | S 3 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | S 5 | S 5 | S 4 | S 4 | S 4 | S 4 | S 4 | SSE 4 | S 4 | SSE 4 | SSE 4 | SSE 5 | SSE 5 | SSE 5 | SSE 5 | SSE 6 | SE 7 |
| kJ | 16 | 16 | 6 | 56 | 97 | 71 | 53 | 45 | 40 | 26 | 15 | 7 | 9 | 6 | 4 | 7 | 11 | 25 | 31 | 48 | 55 | 71 | 260 | 618 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 9 | 9 | 17 | 583 | 101 | 18 | 23 | 23 | 17 | 557 | 143 | 17 | 110 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 859 | 859 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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