Mahai'ula Bay Surf Forecast

/ HAW – Big Island (60 breaks) / Hawaii (267 breaks) /

USA (1297 breaks) / Lat Long: (19.79° N 156.04° W)

Surf Forecasts:

Mahai'ula Bay surfForecast / HAW – Big Island / USA

12 Day Weather and Surf, issued 1 am Wednesday 15 Oct 2025 HST

Forecast update in hr min s Forecast update imminent

Mahai'ula Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Mahai'ula Bay sea temperature is 27.1° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Mahai'ula Bay this week:

The surf forecast for Mahai'ula Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Oct 15) at 8AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.5m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Mahai'ula Bay in the next 12 days are 0.7m 14s and forecast to arrive on Thursday (Oct 16) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Saturday (Oct 18) at 11PM.

Wave Type	Time (HST) & Date	Wave Height & Period
Next good surf (1 star+)	8AM (Wed 15th Oct)	2ft (0.6m) 14s
Best Surf	8AM (Wed 15th Oct)	2ft (0.6m) 14s
Most Powerful	11AM (Thu 16th Oct)	2.5ft (0.7m) 14s

Table - best surf conditions forecast for Mahai'ula Bay over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Light rain (total 7mm), mostly falling on Wed night. Warm (max 27°C on Wed afternoon, min 25°C on Wed morning). Wind will be generally light.									Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Sat night. Warm (max 27°C on Sun morning, min 25°C on Sat morning). Wind will be generally light.
	Wednesday 15			Thursday 16			Friday 17			Saturday 18			Sunday 19			Monday 20			Tuesday 21
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	0	0	1	0	0	1	0	0	1	0	0	1	0	0	0	0	0	0	1	0	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	WNW	WNW	NW	NW	NW	NW	NW	NW	NW	NW	NW	WNW	NNE	WNW	NW	NW	WNW	NW	NNW	NW	NW
Period(s) (?)	13	13	14	14	14	13	13	13	14	13	12	15	8	13	12	12	2	12	17	16	15
Wave Graph (?)
kJ (?)	114	111	167	181	125	108	85	87	116	102	38	84	0	68	36	35	1	37	113	125	104
Wind (km/h)	WSW	SSW	NNW	WSW	WSW	WSW	WSW	W	SE	WSW	WSW	ENE	SSW	WSW	S	W	SW	SSE	S	SSW	SSE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	cross	glass	cross- on	cross- on	glass	cross- on	cross- on	off	cross- on	glass	glass	cross	cross- on	glass	on	cross- on	cross- off	glass	cross	cross- off
High Tide / height (m)	11:58AM 0.68		1:06AM 0.43	12:46PM 0.66		1:43AM 0.51	1:25PM 0.64		2:14AM 0.59	1:59PM 0.60		2:44AM 0.66		2:30PM 0.56	3:12AM 0.72		2:59PM 0.52	3:41AM 0.76		3:27PM 0.47	4:11AM 0.78
Low Tide / height (m)		7:11PM 0.13		6:14AM 0.23	7:35PM 0.11		7:15AM 0.21	7:56PM 0.09		8:06AM 0.19		8:16PM 0.08	8:51AM 0.18		8:35PM 0.07	9:32AM 0.17		8:55PM 0.07	10:12AM 0.17		9:16PM 0.07

	Wednesday 15			Thursday 16			Friday 17			Saturday 18			Sunday 19			Monday 20			Tuesday 21
Sunrise	6:18	-	-	6:18	-	-	6:18	-	-	6:18	-	-	6:20	-	-	6:20	-	-	6:20	-	-
Sunset	-	6:00	-	-	6:00	-	-	5:59	-	-	5:58	-	-	5:57	-	-	5:57	-	-	5:55	-

Rain (mm)	-	-	2	-	1	2	-	1	1	-	-	2	-	2	3	1	-	2	-	2	1
Temp. °C	26	27	25	27	27	26	26	26	25	26	26	25	27	26	26	27	26	26	27	26	26
Feels °C (?)	28	29	27	29	29	28	29	27	28	28	29	28	29	28	30	30	29	28	30	28	30

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for HAW - Big Island

Wind Update Continuing clean conditions at Mahai'ula Bay (calm at Palani Junction wx 11 km from Mahai'ula Bay). A 0.7m groundswell from the WNW
1 hour 22 minutes ago Mahai'ula Bay

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1 h 22 min ago

2 km/h

Clean

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Mahai'ula Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

Information about the Mahai'ula Bay Surf forecast

The above surf forecast table for Mahai'ula Bay provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Mahai'ula Bay can be found by selecting the local surf guide option on the grey menu. Our Mahai'ula Bay surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Mahai'ula Bay) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Mahai'ula Bay may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Mahai'ula Bay is 100 km (62 miles) from Hilo. If you plan a vacation in Big Island, look for hotels and other accommodation in Hilo. Hilo has rooms for a wide range of budgets as well as car hire and transport links.