Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 02 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.1° 

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


Ammonias surf forecast from 2 Aug 2026:

  • Most powerful swell: Sunday 2 Aug, 2PM (local time) - 7ft (2.2m), 8s period, ENE swell with 715 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.2m 8s and forecast to arrive on Sunday (Aug 02) at 2PM. 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 2PM (Sun 2nd Aug)7ft (2.2m) 8s

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


The Lowdown

Alright, folks, let's get into it. Rusty here, and I've got the full 16-day picture for you. Honestly, looking at the charts for Ammonias, it's a bit of a tough stretch. The conditions are messy for the most part, with a lot of lumpy, cross-shore wind messing up the surface. The water's sitting at a pretty standard 80°F, which is pretty much bang on average for this time of year, so no surprises there.

The opening days are a write-off. We've got a moderate swell running, around 8ft to 8ft on Sunday, but it's short-period, 8 seconds, and those cross-shore winds are just chopping it all up. The energy is moderate (1066), but the quality is poor. Monday and Tuesday aren't much better. The swell drops a bit, but the wind stays on the cross, making for a lumpy, uninviting ocean. The combined energy drops into the moderate range (down to 454), but it's still not clean.

We do get a bit of a glimmer later in the week, though. On Tuesday, the 4th of August, the swell period jumps up to 12 seconds in the morning. That's a groundswell pulse, and the height is a manageable 5ft. The energy is moderate (673). The wind is still cross-shore, but it's a gentler breeze, so the chop won't be as aggressive. It's still marginal, but the longer period will give the waves better shape. Keep an eye on that Tuesday morning window.

The following week is a real mixed bag. The wind is persistent from the ENE, keeping things choppy. There's a brief pulse of long-period swell from the SSW around the 10th and 11th, with period up to 16 seconds, which is long-period groundswell. The energy is moderate (595 to 639). This kind of long-period swell can work well at a reef break like Ammonias, which is exposed to the SSE. The wind is still a factor, making it marginal.

Then, around the 12th of August, we see a bigger groundswell from the south, with a period of 17-18 seconds and a wave height of 4ft. The combined energy jumps up to 1165, which is a strong energy reading. This is the most powerful swell of the whole period, but the wind is still cross-shore or cross-onshore, so it's going to be a battle with the chop. It's likely too small for the bigger energy to really show, but the potential is there.

The very end of the outlook, around the 17th of August, shows a bigger swell of 8ft from the ENE, but still with a short period of 8 seconds. The wind finally eases a bit, becoming a light breeze, but it's still cross-onshore. The energy is strong (1213), but the short period and wind direction mean it's going to be a messy, walled-up wave. That's strictly for the experienced crew.

Overall, the best bet in this window is that Tuesday the 4th of August morning for the slightly longer period waves, or the long-period SSW groundswell around the 10th and 11th if you're willing to roll the dice on the wind. It's not a classic period, but there are a few windows to sneak a wave.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Sun afternoon, min 23°C on Sun night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Wed afternoon. Warm (max 26°C on Wed morning, min 24°C on Wed night). Wind will be generally light.

Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
1
1
0
0
1
1
1
0
1
1
0
0
0
0
0
0
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.3
ENE
8
2.2
ENE
8
2.1
ENE
8
1.7
ENE
8
1.5
ENE
8
1.3
ENE
8
1.5
ENE
12
1.4
ENE
11
1.6
ENE
11
1.3
ENE
10
1.2
ENE
10
0.9
ENE
9
1
ENE
8
1
ENE
8
1.1
E
6
1.2
ENE
7
0.4
SW
20
1.6
ENE
6
1.6
ENE
7
1.7
ENE
7
2
ENE
7
Wave Graph
Metric surfscale
Energy kJ
776
665
574
385
306
234
583
452
561
331
269
116
150
128
82
147
98
159
219
255
360
Wind (km/h)
30
NE
30
NE
20
NE
20
ENE
20
NE
15
NE
20
ENE
15
NE
15
ENE
15
ENE
15
ENE
15
NE
15
E
20
ENE
20
ENE
25
ENE
20
ENE
20
E
25
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross
cross
High Tide
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
10:10AM0.50m
11:24AM0.57m
12:26PM0.64m
1:18PM0.69m
00:17AM0.19m
Low Tide
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
2:46AM0.02m
3:47AM0.01m
4:56AM-0.01m
9:20PM0.16m
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
thunderstorm
part cloud
clear
clear
clear
clear
cloud
light rain
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:15
7:14
7:13
7:13
 mm
2
1
Temp °C
25
26
24
25
26
24
25
26
24
26
26
25
26
26
25
25
26
25
26
26
25
Feels °C
24
24
22
25
26
25
25
27
25
27
27
26
27
27
26
26
26
25
26
26
25
  • 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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