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Surf Forecasts:
Mainside surfForecast / Okinawa / Japan
48hr Weather and Surf, issued 8 am Sunday 31 May 2026 JSTForecast update in hr min s Forecast update imminent
Mainside surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mainside sea temperature is
25.8° C
(Which is normal for this time of year)How big are the waves at Mainside today (31 May):
- Morning surf: Morning surf (31 May, local time) - 1.5ft (0.5m), 10s period with E swell.
- Afternoon surf: Afternoon surf (31 May, local time) - 1ft (0.3m), 11s period with E swell.
- Evening surf: Evening surf (31 May, local time) - 1ft (0.3m), 6s period with NNW swell.
The current surf forecast for Mainside at 11AM is: 0.5m 10s primary swell from a East direction and 0.3m 10s secondary swell from a East direction (forecast issued at 08:00am May 31). An open ocean swell of 1.7m 14s is not directed at the surf break, a second open ocean swell of 1.1m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | 1.5ft (0.5m) | 10s |
| Afternoon (31 May) | 1ft (0.3m) | 11s |
| Evening (31 May) | 1ft (0.3m) | 6s |
Table - waves today at Mainside. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 98mm), heaviest during Mon afternoon. Warm (max 27°C on Sun afternoon, min 24°C on Sun morning). Winds decreasing (stormy winds from the ESE on Mon afternoon, light winds from the W by Tue night). | ||||||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | Wed 3 | |||||||||||||||||||||
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 | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SSE 16 | E 10 | SSE 15 | E 11 | SSE 14 | NNW 6 | E 6 | E 7 | E 8 | SSE 14 | SE 14 | ESE 12 | SE 14 | SE 14 | E 10 | NNE 11 | NNE 12 | NNE 12 | W 8 | WNW 8 | NNW 9 | NNW 9 | N 9 | N 10 | |
0 | 52 | 0 | 20 | 0 | 6 | 425 | 554 | 1015 | 0 | 0 | 0 | 0 | 0 | 666 | 25 | 55 | 28 | 1583 | 1184 | 615 | 572 | 627 | 802 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | cross-off | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | |
High Tide | 6:30AM1.92m | 7:56PM1.75m | 6:56AM1.93m | 8:27PM1.76m | 7:24AM1.93m | 8:58PM1.76m | ||||||||||||||||||
Low Tide | 1:21PM0.21m | 1:18AM0.99m | 1:50PM0.19m | 1:46AM1.01m | 2:18PM0.19m | 2:16AM1.03m | ||||||||||||||||||
 | | | |  |  |  | |  |  |  | |  |  |  |  | | | | | | |  | | |
 | 5:35 | — | — | — | — | — | — | 5:35 | — | — | — | — | — | — | — | 5:35 | — | — | — | — | — | — | — | 5:35 |
 | — | — | — | — | 7:15 | — | — | — | — | — | — | — | 7:16 | — | — | — | — | — | — | — | 7:16 | — | — | 7:17 |
— | — | — | — | — | — | 1 | 2 | 2 | 8 | 1 | 8 | 44 | 22 | 1 | 1 | 5 | 2 | — | — | 1 | — | — | — | |
Temp °C | 23 | 24 | 26 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 |
22 | 23 | 26 | 27 | 26 | 25 | 23 | 23 | 21 | 20 | 18 | 16 | 14 | 20 | 27 | 18 | 14 | 18 | 21 | 23 | 26 | 28 | 27 | 28 | |
Swell 1 Height (m) Direction Period (s) | SSE 12 | SSE 14 | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SSE 14 | SSE 14 | SSE 14 | SSE 14 | — | S 14 | — | — | E 10 | ESE 10 | ESE 10 | SSE 10 | SSE 9 | S 9 | NNW 9 | NNW 9 | N 9 | N 10 |
 kJ | 247 | 917 | 1358 | 1797 | 2020 | 2167 | 2297 | 2948 | 3387 | 4120 | — | 3887 | — | — | 666 | 628 | 218 | 433 | 236 | 240 | 615 | 572 | 627 | 802 |
Swell 2 Height (m) Direction Period (s) | SSE 16 | E 10 | — | E 11 | — | NNW 6 | — | — | — | — | — | — | — | — | — | NNE 11 | NNE 12 | SE 12 | NNE 12 | ESE 11 | SSE 8 | SSE 8 | NW 8 | SSE 8 |
| kJ | 273 | 19 | — | 20 | — | 6 | — | — | — | — | — | — | — | — | — | 25 | 55 | 39 | 14 | 12 | 154 | 119 | 79 | 66 |
Swell 3 Height (m) Direction Period (s) | SSE 12 | E 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 12 | N 11 | NE 12 | SE 10 | ESE 10 | SSE 8 | E 10 |
| kJ | 48 | 52 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 28 | 2 | 5 | 52 | 59 | 81 | 17 |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NE 5 | NE 5 | ENE 5 | ENE 5 | E 6 | E 7 | E 8 | E 8 | SE 14 | ESE 12 | SE 14 | SE 14 | SSE 13 | SSW 12 | SW 10 | W 9 | W 8 | WNW 8 | W 7 | W 7 | W 7 | W 6 |
| kJ | 20 | 34 | 54 | 51 | 77 | 143 | 425 | 554 | 1015 | 1432 | 9709 | 6763 | 20727 | 11148 | 5868 | 5417 | 6998 | 3106 | 1583 | 1184 | 339 | 226 | 89 | 27 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 10 | 10 | 650 | 863 | 1330 | 650 | 735 | 608 | 608 | 608 | 650 | 736 | 608 | 608 | 608 | 608 | 600 | 608 | 608 | 765 | 24 | 15 | 15 | 15 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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