Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 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 3 Aug 2026:

  • Most powerful swell: Sunday 2 Aug, 11PM (local time) - 7ft (2.2m), 8s period, ENE swell with 665 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 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 11s period and expected on Sunday (Aug 09) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Sun 2nd Aug)7ft (2.2m) 8s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on offer at Ammonias. It’s a reef setup, and it’s a bit of a waiting game over the next couple of weeks. The pattern is a slow start, a few windows of marginal fun, and then a jump in size that comes with messy wind.

Right now, through the first week, the wind is a problem. We’ve got a persistent ENE breeze, swinging from cross to cross-on, and it’s keeping things choppy and lumpy. The swell is a short-period ENE windswell, mostly between 4ft and 6ft, with combined energy readings in the moderate range (338 to 865). The best of the early days is Monday morning, 3rd August, with 6ft of ENE swell and a moderate cross-shore wind. The quality is marginal, but it’s the most shape you’ll see until the pattern shifts. The water’s sitting at 80°F, which is right on the money for this time of year.

The real shift happens in the second week, around the 10th of August. We get a couple of pulses of long-period SSW groundswell rolling in. On Monday afternoon, 10th August, we’ve got 3ft of SSW swell with a period of 15 seconds, pushing combined energy to 515. The wind is still cross, so it’s not clean, but that long period holds promise. The standouts are a couple of days later: Wednesday the 12th and Thursday the 13th of August. The swell ticks up to 4ft – 4ft from the S, with a period of 15-18 seconds. The combined energy jumps into the strong range (1137 to 1258). The wind is still cross-on, making it a lumpy affair, but the energy is there. For a reef setup, that long-period S swell is what you want to see. It’s not perfect, but it’s the most interesting offering in the whole window.

The last few days, from the 14th onward, the swell gets bigger again, pushing 7ft to 8ft from the ENE, but the wind is blowing fresh, 15-18 mph, cross to cross-on. That’s a recipe for messy, lumpy conditions. The combined energy hits over 1000 (strong), but without clean wind, it’s going to be a battle. Too much size for beginners, and even for the experienced crew, it’s going to be a grunt.

So, to be straight with you: the best bet is that window around the 12th and 13th of August. The S groundswell is the standout, with serious energy. It’s not a classic day, but it’s the best you’ll get. The rest of the time, you’re wrestling with wind.

Rusty.

Short Range Forecast

Light rain (total 6mm), mostly falling on Tue afternoon. Warm (max 26°C on Sun afternoon, min 23°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

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

Sun
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
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
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.2
ENE
8
2.1
ENE
8
1.7
ENE
8
1.5
ENE
8
1.4
ENE
8
1.5
ENE
12
1.5
ENE
11
1
ENE
11
1.4
ENE
10
1.2
ENE
10
0.8
ENE
9
1.2
ENE
8
1.3
ENE
8
0.4
SSW
14
0.4
SW
21
0.4
SW
20
1.4
ENE
6
1.4
ENE
7
1.6
ENE
7
1.7
ENE
7
Wave Graph
Metric surfscale
Energy kJ
642
574
385
306
268
583
515
245
363
269
92
202
223
81
115
101
114
186
220
262
Wind (km/h)
30
NE
20
NE
20
ENE
20
NE
15
NE
15
ENE
20
ENE
15
ENE
15
ENE
15
ENE
15
ENE
20
ENE
20
ENE
15
ENE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross-on
cross-on
cross
cross
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
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
part cloud
clear
part cloud
part cloud
light rain
thunderstorm
thunderstorm
cloud
rain showers
clear
clear
clear
part cloud
part cloud
rain showers
part cloud
cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
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
1
4
1
2
1
1
Temp °C
26
24
25
26
25
25
25
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
24
22
25
26
26
26
25
27
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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