Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.3°C
0.4° 

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


Ammonias surf forecast from 31 Aug 2026:

  • Most powerful swell: Sunday 6 Sep, 5PM (local time) - 7.5ft (2.3m), 13s period, ENE swell with 1,723 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.3m 13s and forecast to arrive on Sunday (Sep 06) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Sun 6th Sep)7.5ft (2.3m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s get straight into what’s cookin’ for Ammonias over the next couple of weeks.

Right off the bat, I gotta be honest with ya – the first few days are a write-off. Monday the 31st of August through to the end of that first week, the wind is a real problem. We’ve got a persistent moderate to fresh cross-shore breeze out of the ENE, often with rain showers and even a risk of thunderstorms. The swell is on the small side, around 6 ft to 8 ft, but it’s short-period, wind-driven stuff from the ENE, and the surface is just lumpy and choppy. The combined energy is moderate (783 to 1255), but it’s all for nothing with that wind. There’s nothing to ride here, so don’t bother paddling out.

That gap continues right through the first week – no real surf on offer until we get to Sunday the 6th of September. Even then, it’s still marginal. The wind’s still cross-shore, and the swell’s not doing us any favours.

Now, here’s where it gets interesting. The standout window is Tuesday the 8th of September. After a morning of lumpy, 10 ft ENE swell and fresh cross-shore wind, the afternoon shifts. The wind swings around to the north, becoming a clean cross-offshore breeze, and the swell jumps to 12 ft out of the ENE with a 12-second period. That’s a solid, powerful groundswell with very strong energy (4141). That’s a serious amount of juice. This is the best you’re gonna get in this outlook, but it’s big – that’s expert territory. The reef at Ammonias will handle it, but don’t take it lightly. The water temperature is about average for the time of year, so no surprises there.

After that, it’s back to marginal or poor conditions through the rest of the second week, with the swell dropping off and the onshore wind creeping back in. The energy drops right back to moderate (340 to 747) by Wednesday the 9th, and the wind turns cross-on again. The final days from the 10th to the 15th of September are pretty much a bust, with small, weak swell and poor winds.

So, bottom line: the only real chance for a decent wave is the afternoon of Tuesday the 8th of September at Ammonias. It’s a big, powerful, clean wave on a reef, but it’s for the experienced crew only. The rest of the 16 days? You’re better off waiting for the next swell.

Rusty.

Short Range Forecast

Moderate rain (total 15mm), heaviest on Sun night. Warm (max 27°C on Wed morning, min 24°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 20mm), heaviest during Sat morning. Warm (max 27°C on Sat afternoon, min 25°C on Wed night). Mainly fresh winds.

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1
0
0
0
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
ENE
7
2.1
ENE
7
1.8
ENE
8
1.8
ENE
8
1.9
ENE
8
1.9
ENE
8
1.9
ENE
8
1.9
ENE
8
0.9
S
16
1.9
ENE
8
2.2
E
8
2
ENE
8
2.3
ENE
8
2.4
ENE
8
2.3
ENE
8
2.4
ENE
8
2.5
ENE
8
2.5
ENE
8
3
ENE
8
Wave Graph
Metric surfscale
Energy kJ
339
475
362
391
410
432
445
443
406
411
566
464
604
690
686
672
744
887
1026
Wind (km/h)
25
ENE
25
ENE
25
NE
20
NE
25
ENE
25
NE
25
NE
20
ENE
25
NE
25
ENE
30
ENE
30
NE
30
NE
35
NE
30
ENE
30
ENE
30
ENE
25
ENE
25
E
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
High Tide
5:58AM0.49m
5:08PM0.42m
6:57AM0.52m
5:24PM0.35m
8:09AM0.55m
5:17PM0.30m
9:35AM0.57m
10:57AM0.61m
12:04PM0.65m
11:37PM0.20m
Low Tide
11:17PM0.04m
11:48AM0.20m
11:45PM0.03m
1:02PM0.26m
00:18AM0.03m
3:05PM0.29m
1:01AM0.04m
2:01AM0.05m
3:24AM0.06m
8:23PM0.17m
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
part cloud
cloud
part cloud
rain showers
light rain
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:20
6:20
6:20
6:20
6:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:54
6:54
6:53
6:52
6:52
6:51
6:50
 mm
2
2
1
3
1
1
3
2
4
3
1
2
5
5
11
Temp °C
26
26
26
25
26
26
25
27
27
26
26
26
25
26
26
25
26
27
26
Feels °C
26
25
25
24
25
25
24
28
26
26
25
24
23
23
23
23
25
27
26
  • Map Icons:
  • Break
  • 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 Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias 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 (Ammonias) 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 Ammonias 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 vacation in Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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