Marosi Surf Break

Lat Long: 9.74° S 119.18° E

Marosi Surf Forecast and Surf Report

Issued: 7 am 15 Sep 2026 (local time)

Forecast update in  hr  min

Today's Marosi sea temperature is
26.2°C
0.7° 

Marosi surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Marosi surf forecast from 15 Sep 2026:

  • Best quality surf: Wednesday 16 Sep, 2AM (local time) - 6ft (1.8m), 15s period, SW swell with cross-offshore winds.
  • Most powerful swell: Sunday 20 Sep, 11PM (local time) - 7ft (2.1m), 16s period, SW swell with 2,203 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 16 Sep, 2AM (local time) - 6ft (1.8m), 15s period with SW swell.

Best Forecast Surf Conditions for Marosi this week:

The surf forecast for Marosi over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 2AM. The primary swell is predicted to be 1.8m and 15s period with a secondary swell of 0.1m and 24s. Another secondary swell of 0.7m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Marosi in the next 16 days are 2.1m 16s and forecast to arrive on Sunday (Sep 20) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Sunday (Sep 20) at 11PM.

Wave TypeTime (WITA) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Wed 16th Sep)6ft (1.8m) 15s
Best Surf 2AM (Wed 16th Sep)6ft (1.8m) 15s
Most Powerful11PM (Sun 20th Sep)7ft (2.1m) 16s

Table - best surf conditions forecast for Marosi over the next 16 days.


The Lowdown

G’day, Rusty here. Let’s have a yarn about what’s coming up at Marosi over the next couple of weeks. Right off the bat, I’ve got to be straight with you – the first several days are a bit of a write-off for decent waves. The swell is hanging around, but the wind and conditions aren’t playing ball. Tuesday morning (the 15th) kicks off with a solid 6ft SW groundswell at 15 seconds and the combined energy is a hefty 1669 (moderate-strong), but the wind’s blowing a cross-onshore at 12 mph from the SSE, making it choppy. Water temp is sitting at 79°F – about average for this time of year, so no surprises there. It’s a reef break for advanced surfers only, and with those conditions, it’s just not happening. The score reflects that – a big fat zero for the morning and only a 1 for the afternoon. That’s poor. Wednesday through Saturday morning are all showing marginal surf with onshore or cross-onshore winds and only light breezes, but the wave comment keeps saying “poor” or “marginal,” so there’s nothing to get excited about. We’re basically staring at a week of nothing worth paddling out for.

Now, hold on, because things get interesting late in the piece. The standout window is Saturday the 26th and Sunday the 27th. On Saturday morning, Marosi gets a very long-period SSW swell at 23 seconds – that’s proper groundswell energy – and the combined energy spikes to 4171 (strong). It’s 5ft and blowing onshore from the S with a light breeze, so the morning is unknown but promising. Saturday afternoon though? That’s the one. The swell jumps to 10ft from the SSW at 20 seconds, with a combined energy of 6987 (very strong). The wind is a light cross-onshore from the SE, so it’ll be a bit bumpy but manageable. For an advanced reef break, this is going to be pumping. That’s the absolute peak of the forecast and the only day I’d call a standout – it’s big and powerful, so only for experts. Sunday morning keeps that 10ft SSW at 18 seconds, with onshore wind, energy at 5852 (very strong). It’s still all-time but you’ll want to be out early before the wind swings. The afternoon drops to 10ft but period shortens to 17 seconds, energy 4583 – still solid, but the cross-shore wind might clean it up a touch. Those two days are the real deal.

The rest of the second week has some size but nothing that hits those highs. Monday the 28th has 8ft SSW at 16 seconds (energy 2599) with onshore wind in the morning, and Tuesday the 29th afternoon sees 5ft SSW with a light cross-shore breeze and only 6 mph winds – that one could be clean but it’s much smaller. Wednesday the 30th has 6ft SSW at 16 seconds but the wind is light and cross-shore in the afternoon, energy 1647 – not a standout but a solid session if you miss the big weekend.

In short: the next week is mostly a bust. Then Saturday the 26th and Sunday the 27th fire up with massive, long-period SW groundswell. That’s your best bet by a long shot, but it’s serious juice – not a spot for beginners. Marosi is a consistent reef, but with that much energy and those periods, the sets will be long and the paddle out might be easier between them. Expect crowds sometimes. Stick to the weekend of the 26th and 27th for the real action. Rusty out.

Short Range Forecast

Mostly dry. Warm (max 27°C on Tue afternoon, min 23°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light.

Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
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
1
4
1
1
4
2
2
4
2
1
3
1
0
4
1
2
4
2
1
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
SW
15
1.8
SW
15
1.8
SW
15
1.9
SW
15
1.8
SW
14
1.9
SW
15
2
SSW
14
1.9
SW
14
1.8
SW
14
1.6
SW
14
1.6
SW
14
1.4
SW
14
1.3
SW
14
1.2
SW
14
1
SW
18
1.8
SW
17
2
SW
16
2.1
SW
16
2.1
SW
15
1.9
SW
14
1.7
SW
14
Wave Graph
Metric surfscale
Energy kJ
1650
1581
1581
1446
1307
1446
1690
1533
1285
990
907
661
676
581
609
1915
1968
2203
1801
1521
1115
Wind (km/h)
20
SSE
20
SE
10
E
15
SSW
15
SE
5
ENE
15
SSW
15
SE
5
NNE
15
SSW
15
SE
5
ENE
15
SSW
15
SE
5
ENE
15
S
15
SE
5
ENE
15
SSW
15
SE
5
E
Wind State
cross-on
cross-on
cross-off
on
cross-on
cross-off
on
cross
off
on
cross-on
glassy
on
cross-on
cross-off
on
cross-on
cross-off
on
cross-on
cross-off
High Tide
12:33PM2.52m
00:35AM2.91m
1:01PM2.31m
1:01AM2.76m
1:28PM2.08m
1:26AM2.57m
1:55PM1.85m
1:51AM2.35m
2:26PM1.61m
2:21AM2.12m
4:06PM1.39m
3:25AM1.89m
10:13PM1.62m
Low Tide
6:24PM0.43m
7:02AM0.26m
6:47PM0.59m
7:32AM0.44m
7:09PM0.76m
8:05AM0.65m
7:28PM0.95m
8:45AM0.89m
7:42PM1.15m
9:52AM1.11m
7:20PM1.36m
1:49PM1.12m
1:02AM1.60m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:56
5:56
5:54
5:54
5:54
5:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:59
5:59
5:59
5:59
5:59
5:59
5:59
 mm
Temp °C
26
27
25
26
27
26
26
27
26
26
26
25
26
26
25
25
27
25
26
27
26
Feels °C
26
27
26
27
28
29
27
28
29
27
27
27
26
27
27
28
28
28
27
28
30
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Marosi Surf forecast

The above surf forecast table for Marosi provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Marosi can be found by selecting the local surf guide option on the grey menu. Our Marosi 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 (Marosi) 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 Marosi 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.

Are you planning a holiday in Sumba? If you are looking for accommodation near Marosi, camping, hotels and holiday cottages in Sumba, consider staying in Adalara which is 29 km (18 miles) away.

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