Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 31 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 1 Sep 2026:

  • Most powerful swell: Sunday 6 Sep, 5AM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,155 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.5m 13s and forecast to arrive on Sunday (Sep 06) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Sun 6th Sep)8ft (2.5m) 13s

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


The Lowdown

Alright, surfers, Rusty here. We've got a long look ahead for Ammonias, and I gotta be straight with you – it's a tough stretch. The water's sitting at a warm 81°, which is pretty average for this time of year, so no surprises there.

The pattern for the next 16 days is dominated by a persistent ENE wind, which is cross-shore for Ammonias, but it's often blowing fresh at 15 to 19 mph. That's going to keep the surface lumpy and messy. We'll see a few pulses of swell, but the quality just isn't there for any proper standouts.

Let's walk through it. Starting Monday the 31st of August, we've got a 7 ft ENE swell with a short period of 7 seconds, but it's brought in by a 19 mph cross-shore wind that'll leave it choppy and poor. The wave energy is moderate at 743, but the conditions are a write-off. Tuesday morning, September 1st, is a similar story: 6 ft, 8-second period, cross-shore wind, and marginal at best. We go through Wednesday the 2nd with a 16-second, 3 ft S swell in the morning, but that's a cross-on wind and the energy is moderate at 921, still poor conditions.

Right through to the 5th of September, we're stuck in this cross-shore, short-period, lumpy groove. The swell heights bounce between 6 ft and 8 ft, but the wind is relentless. The 5th afternoon sees a jump in energy to 2758, and a 8 ft ENE swell with a 14-second period, but the wind is still cross-shore and moderate. This is the closest we get to something interesting, but even then, it's only a marginal forecast.

Come the 6th of September, the wind turns cross-on and the surf gets lumpy again. The 8th of September has a window with a 6 ft, 10-second ENE swell and a 16 mph cross-shore, which is just about the best we see, but it's still only a 1/10 in quality. From the 10th of September onward, the swell drops off significantly, the energy falls to weak levels, and the wind stays onshore or cross-shore. The 13th of September sees a 2 ft, 18-second S swell, but the energy is only 359 and the wind is cross-on, making it a total non-starter.

Honestly, there's no standout session here. The persistent fresh cross-shore wind and the short-period, lumpy conditions mean any potential is completely blown out. For the first week, the only half-decent window is the afternoon of the 5th (Saturday), but it's marginal. The second week is a dead loss with fading swell and poor winds. This is a stretch where you're better off checking the wind forecast again than paddling out.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Mon morning. Warm (max 27°C on Wed morning, min 24°C on Mon night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 19mm), heaviest on Sat night. Warm (max 27°C on Sat afternoon, min 25°C on Thu morning). Mainly fresh winds.

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
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
1
1
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2
ENE
7
1.8
ENE
8
2
ENE
8
1.9
ENE
8
1.8
ENE
8
2.1
ENE
8
0.9
S
16
0.9
S
16
2
ENE
8
2.3
ENE
8
2.2
ENE
8
2.5
ENE
8
2.5
ENE
8
2.3
ENE
8
1.7
SSE
12
2.3
ENE
8
2.4
ENE
14
2.5
ENE
13
2.4
ENE
13
2.2
ENE
13
2.4
ENE
12
Wave Graph
Metric surfscale
Energy kJ
435
392
451
421
392
520
427
414
464
574
555
906
765
653
754
606
2049
2091
1893
1556
1622
Wind (km/h)
30
ENE
25
ENE
20
ENE
25
ENE
25
NE
25
ENE
20
ENE
25
ENE
25
ENE
30
ENE
30
NE
30
NE
30
ENE
30
ENE
30
ENE
25
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross
High Tide
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
12:57PM0.68m
00:45AM0.25m
Low Tide
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
8:30PM0.15m
rain showers
rain showers
rain showers
rain showers
clear
rain showers
clear
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
cloud
rain showers
rain showers
thunderstorm
thunderstorm
thunderstorm
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
6:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:54
6:53
6:52
6:52
6:51
6:50
6:49
 mm
2
1
2
1
3
1
3
2
2
1
2
2
2
8
4
3
2
Temp °C
26
26
25
26
26
25
27
27
26
26
26
25
25
26
25
26
27
26
26
27
26
Feels °C
25
25
24
25
25
24
27
27
26
25
24
23
23
24
23
26
27
26
26
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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